{"id":35976,"date":"2022-08-17T16:22:40","date_gmt":"2022-08-17T07:22:40","guid":{"rendered":"https:\/\/kinsta.com\/jp\/?p=35976&#038;preview=true&#038;preview_id=35976"},"modified":"2023-08-25T16:30:50","modified_gmt":"2023-08-25T07:30:50","slug":"errors-in-javascript","status":"publish","type":"post","link":"https:\/\/kinsta.com\/jp\/blog\/errors-in-javascript\/","title":{"rendered":"JavaScript\u306e\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u306e\u89e3\u6c7a\u65b9\u6cd5\uff08\u6c7a\u5b9a\u7248\uff09"},"content":{"rendered":"<p>\u304b\u306e\u6709\u540d\u306a\u30de\u30fc\u30d5\u30a3\u30fc\u306e\u6cd5\u5247\u306b\u3053\u3093\u306a\u8a00\u8449\u304c\u3042\u308a\u307e\u3059\u2500\u300c\u5931\u6557\u3059\u308b\u4f59\u5730\u304c\u3042\u308b\u306a\u3089\u3001\u5931\u6557\u3059\u308b\u300d\u3002\u3053\u308c\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u4e16\u754c\u306b\u3082\u5f53\u3066\u306f\u307e\u308a\u307e\u3059\u3002\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u4f5c\u308a\u306b\u3001\u30d0\u30b0\u3084\u305d\u306e\u4ed6\u306e\u554f\u984c\u306e\u767a\u751f\u306f\u3064\u304d\u3082\u306e\u3002JavaScript\u3067\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u306e\u306f\u3001\u4f55\u3082\u4e0d\u601d\u8b70\u306a\u3053\u3068\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306a\u554f\u984c\u3092\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u8ff7\u60d1\u3092\u304b\u3051\u308b\u524d\u306b\u3001\u3044\u304b\u306b\u89e3\u6c7a\u3067\u304d\u308b\u304b\u3002\u3053\u308c\u3053\u305d\u304c\u3001\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u88fd\u54c1\u306e\u6210\u529f\u3092\u5de6\u53f3\u3057\u307e\u3059\u3002\u305d\u3057\u3066\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-javascript\/\">JavaScript<\/a>\u3068\u8a00\u3048\u3070\u3001\u3059\u3079\u3066\u306e<a href=\"https:\/\/kinsta.com\/blog\/best-programming-language-to-learn\/\">\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e<\/a>\u306e\u4e2d\u3067\u3082\u3001\u305d\u306e\u5e73\u5747\u7684\u306a\u30a8\u30e9\u30fc\u51e6\u7406\u8a2d\u8a08\u3067\u77e5\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/kinsta.com\/jp\/blog\/javascript-libraries\/\">JavaScript\u3067\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u958b\u767a<\/a>\u3057\u3066\u3044\u308b\u3068\u3001\u9ad8\u3044\u78ba\u7387\u3067\u4e00\u5ea6\u306f\u30c7\u30fc\u30bf\u578b\u306b\u3064\u3044\u3066\u5931\u6557\u3059\u308b\u306f\u305a\u3002\u305d\u306e\u4ed6\u306b\u3082\u3001undefined\u3092null\u306b\u3057\u3066\u3057\u307e\u3063\u305f\u308a\u3001\u4e09\u91cd\u7b49\u53f7\u6f14\u7b97\u5b50(<code>===<\/code>)\u3092\u4e8c\u91cd\u7b49\u53f7\u6f14\u7b97\u5b50(<code>==<\/code>)\u306b\u3057\u3066\u3057\u307e\u3063\u305f\u308a\u2026\u3068\u3044\u3046\u30df\u30b9\u304c\u767a\u751f\u3059\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u9593\u9055\u3044\u3092\u72af\u3059\u306e\u306f\u4eba\u9593\u306e\u3055\u304c\u3002\u3053\u308c\u3092\u8e0f\u307e\u3048\u305f\u4e0a\u3067\u3001JavaScript\u306e\u30a8\u30e9\u30fc\u306b\u5bfe\u51e6\u3059\u308b\u4e0a\u3067\u5927\u4e8b\u306a\u70b9\u3092\u3054\u7d39\u4ecb\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001JavaScript\u306e\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u306b\u89e6\u308c\u305f\u4e0a\u3067\u3001\u305d\u308c\u3092\u7279\u5b9a\u3057\u3066\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u5b9f\u969b\u306e\u904b\u7528\u74b0\u5883\u3067\u52b9\u7387\u7684\u306b\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u305f\u3081\u306e\u30d2\u30f3\u30c8\u3082\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u59cb\u3081\u307e\u3057\u3087\u3046\u3002<\/p>\n<div><\/div><kinsta-auto-toc heading=\"Table of Contents\" exclude=\"last\" list-style=\"arrow\" selector=\"h2\" count-number=\"-1\"><\/kinsta-auto-toc>\n<h3>JavaScript\u3067\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u306e\u89e3\u6c7a\u65b9\u6cd5\u306b\u3064\u3044\u3066<a href=\"https:\/\/www.youtube.com\/watch?v=CQzwi9_7wHI\" target=\"_blank\" rel=\"noopener noreferrer\">\u52d5\u753b\u3067\u306e\u89e3\u8aac<\/a>\u3082\u3054\u7528\u610f\u3057\u3066\u3044\u307e\u3059\u3002<\/h3>\n<p class=\"p1\"><kinsta-video src=\"https:\/\/www.youtube.com\/watch?v=CQzwi9_7wHI\"><\/kinsta-video><\/p>\n<h2>JavaScript\u306e\u30a8\u30e9\u30fc\u3068\u306f<\/h2>\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u30a8\u30e9\u30fc\u3068\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u6b63\u5e38\u306b\u6a5f\u80fd\u3057\u3066\u3044\u306a\u3044\u72b6\u6cc1\u3092\u6307\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u5b58\u5728\u3057\u306a\u3044\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3053\u3046\u3068\u3057\u305f\u308a\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u63a5\u7d9a\u3055\u308c\u3066\u3044\u306a\u3044\u72b6\u614b\u3067\u30a6\u30a7\u30d6\u30d9\u30fc\u30b9\u306eAPI\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u305f\u308a\u3059\u308b\u306a\u3069\u3002\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u6307\u793a\u3055\u308c\u305f\u4ed5\u4e8b\u3092\u51e6\u7406\u3067\u304d\u306a\u3044\u72b6\u614b\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306a\u72b6\u6cc1\u306b\u76f4\u9762\u3059\u308b\u3068\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u30e6\u30fc\u30b6\u30fc\u306b\u5bfe\u3057\u30a8\u30e9\u30fc\u3092\u6295\u3052\u304b\u3051\u3001\u300c\u3069\u306e\u3088\u3046\u306b\u9032\u3081\u3066\u3088\u3044\u304b\u308f\u304b\u3089\u306a\u3044\u300d\u3068\u4f1d\u3048\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30a8\u30e9\u30fc\u306b\u95a2\u3059\u308b\u60c5\u5831\u304c\u53ef\u80fd\u306a\u9650\u308a\u53ce\u96c6\u3055\u308c\u3001\u305d\u308c\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n<p>\u5229\u7528\u8005\u304c<a href=\"https:\/\/kinsta.com\/jp\/blog\/http-status-codes\/\">\u300c404\u300d\u306e\u3088\u3046\u306a\u6280\u8853\u7684\u306a\u30a8\u30e9\u30fc<\/a>\u3092\u5fc5\u6b7b\u3067\u300c\u89e3\u8aad\u300d\u3059\u308b\u5fc5\u8981\u304c\u306a\u3044\u3088\u3046\u306b\u3001\u3053\u3046\u3057\u305f\u72b6\u6cc1\u3092\u4e88\u6e2c\u3057\u3001\u524d\u3082\u3063\u3066\u5bfe\u51e6\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u3082\u3063\u3068\u308f\u304b\u308a\u3084\u3059\u3044\u30e1\u30c3\u30bb\u30fc\u30b8\u3068\u3057\u3066\u300c\u30da\u30fc\u30b8\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u300d\u306a\u3069\u304c\u8868\u793a\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>JavaScript \u306b\u304a\u3051\u308b\u30a8\u30e9\u30fc\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u3068\u304d\u306b\u8868\u793a\u3055\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002\u3053\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u3001\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u3001\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u3068\u306a\u3063\u305f\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3001\u304a\u3088\u3073\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u3068\u304d\u306e\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306b\u95a2\u3059\u308b\u5341\u5206\u306a\u60c5\u5831\u304c\u542b\u307e\u308c\u307e\u3059\u3002\u307e\u305f\u3001JavaScript\u3067\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u3088\u308a\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u3092\u500b\u5225\u306b\u4f5c\u6210\u3057\u3001\u554f\u984c\u3092\u30c7\u30d0\u30c3\u30b0\u3059\u308b\u969b\u306b\u8868\u793a\u3055\u308c\u308b\u60c5\u5831\u91cf\u3092\u5897\u3084\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u30a8\u30e9\u30fc\u306e\u30d7\u30ed\u30d1\u30c6\u30a3<\/h3>\n<p>JavaScript\u306e\u30a8\u30e9\u30fc\u306e\u5b9a\u7fa9\u304c\u308f\u304b\u3063\u305f\u3068\u3053\u308d\u3067\u3001\u4e2d\u8eab\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>JavaScript\u306e\u30a8\u30e9\u30fc\u306b\u306f\u6a19\u6e96\u7684\u306a\u3001\u305d\u3057\u3066\u3001\u624b\u3092\u52a0\u3048\u308b\u3053\u3068\u3067\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308b\u60c5\u5831\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3067\u3001\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u3068\u5f71\u97ff\u3092\u7406\u89e3\u3057\u3066\u3044\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001JavaScript\u306e\u30a8\u30e9\u30fc\u306f3\u7a2e\u985e\u306e\u60c5\u5831\u3067\u69cb\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<ol>\n<li><strong>Message<\/strong>\uff1a\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u683c\u7d0d\u3059\u308b\u6587\u5b57\u5217<\/li>\n<li><strong>Name<\/strong>\uff1a\u767a\u751f\u3057\u305f\u30a8\u30e9\u30fc\u306e\u7a2e\u985e (\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u6df1\u304f\u6398\u308a\u4e0b\u3052\u307e\u3059)<\/li>\n<li><strong>Stack<\/strong>\uff1a\u30a8\u30e9\u30fc\u767a\u751f\u6642\u306b\u5b9f\u884c\u3055\u308c\u3066\u3044\u305f\u30b3\u30fc\u30c9\u306e\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9<\/li>\n<\/ol>\n<p>\u3055\u3089\u306b\u3001\u300ccolumnNumber\u300d\u3001\u300clineNumber\u300d\u3001\u300cfileName\u300d\u3068\u3044\u3063\u305f\u8a73\u3057\u3044\u60c5\u5831\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u308c\u3089\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u6a19\u6e96\u7684\u306a\u3082\u306e\u3067\u306f\u306a\u304f\u3001JavaScript\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304b\u3089\u751f\u6210\u3055\u308c\u308b\u30a8\u30e9\u30fc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5b58\u5728\u3059\u308b\u3053\u3068\u3082\u3001\u305d\u3046\u3067\u306a\u3044\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306b\u3064\u3044\u3066<\/h3>\n<p>\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3068\u306f\u3001\u4f8b\u5916\u3084\u8b66\u544a\u306a\u3069\u306e\u30a4\u30d9\u30f3\u30c8\u304c\u767a\u751f\u3057\u305f\u3068\u304d\u306b\u3001\u76f4\u524d\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u5b9f\u884c\u3057\u3066\u3044\u305f\u30e1\u30bd\u30c3\u30c9\u3092\u4e00\u89a7\u3067\u793a\u3057\u305f\u3082\u306e\u3067\u3059\u3002\u4f8b\u5916\u3092\u4f34\u3046\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306f\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110237\" aria-describedby=\"caption-attachment-110237\" style=\"width: 1138px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110237 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/type-error-output-numeric.png\" alt=\"\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306e\u4f8b\" width=\"1138\" height=\"278\"><figcaption id=\"caption-attachment-110237\" class=\"wp-caption-text\">\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u898b\u3066\u306e\u901a\u308a\u3001\u307e\u305a\u30a8\u30e9\u30fc\u540d\u3068\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3001\u305d\u306e\u5f8c\u306b\u547c\u3073\u51fa\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u306e\u4e00\u89a7\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u5404\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u306b\u306f\u3001\u305d\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306e\u5834\u6240\u3068\u547c\u3073\u51fa\u3055\u308c\u305f\u30b3\u30fc\u30c9\u304c\u8a18\u8f09\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30c7\u30fc\u30bf\u3092\u7528\u3044\u3001\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u5185\u3092\u79fb\u52d5\u3057\u3001\u3069\u306e\u30b3\u30fc\u30c9\u304c\u30a8\u30e9\u30fc\u3092\u5f15\u304d\u8d77\u3053\u3057\u3066\u3044\u308b\u304b\u3092\u7279\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u51e6\u7406\u306e\u9806\u5e8f\u3092\u53cd\u6620\u3059\u308b\u304b\u305f\u3061\u3067\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u4f8b\u5916\u304c\u51fa\u73fe\u3057\u305f\u5834\u6240\u3068\u3001\u305d\u308c\u304c\u3069\u306e\u3088\u3046\u306b\u4f1d\u642c\u3057\u3066\u3044\u3063\u305f\u306e\u304b\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002\u4f8b\u5916\u306e\u300ccatch\u300d\u3092\u5b9f\u88c5\u3059\u308c\u3070\u3001\u4f8b\u5916\u304c\u30b9\u30bf\u30c3\u30af\u3092\u4f1d\u642c\u3057\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30af\u30e9\u30c3\u30b7\u30e5\u3055\u305b\u3066\u3057\u307e\u3046\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u81f4\u547d\u7684\u306a\u30a8\u30e9\u30fc\u3092\u305d\u306e\u307e\u307e\u306b\u3057\u3001\u610f\u56f3\u7684\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30af\u30e9\u30c3\u30b7\u30e5\u3055\u305b\u308b\u30b1\u30fc\u30b9\u3082\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n<h3>\u30a8\u30e9\u30fc\u3068\u4f8b\u5916<\/h3>\n<p>\u591a\u304f\u306e\u4eba\u304c\u3001\u30a8\u30e9\u30fc\u3068\u4f8b\u5916\u3092\u6df7\u540c\u3057\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u4e21\u8005\u306b\u306f\u82e5\u5e72\u306e\u3001\u305d\u3057\u3066\u5927\u4e8b\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u306e\u3067\u3054\u6ce8\u610f\u304f\u3060\u3055\u3044\u3002<\/p>\n<aside role=\"note\" class=\"wp-block-kinsta-notice is-style-info\">\n            <h3>Info<\/h3>\n        <p>\u4f8b\u5916\u3068\u306f\u3001\u6295\u3052\u3089\u308c\u305f\u30a8\u30e9\u30fc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n<\/aside>\n\n<p>\u308f\u304b\u308a\u3084\u3059\u304f\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u7c21\u5358\u306a\u4f8b\u3092\u6319\u3052\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3057\u3066\u3001JavaScript\u3067\u30a8\u30e9\u30fc\u3092\u5b9a\u7fa9\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">const wrongTypeError = TypeError(\"Wrong type found, expected character\")<\/code><\/pre>\n<p>\u305d\u3057\u3066\u3001\u3053\u306e\u3088\u3046\u306b\u3057\u3066<code>wrongTypeError<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4f8b\u5916\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">throw wrongTypeError<\/code><\/pre>\n<p>\u3057\u304b\u3057\u3001\u591a\u304f\u306e\u4eba\u304c\u3001\u7701\u7565\u5f62\uff08\u30a8\u30e9\u30fc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6295\u3052\u306a\u304c\u3089\u3001\u540c\u6642\u306b\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5\uff09\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">throw TypeError(\"Wrong type found, expected character\")<\/code><\/pre>\n<p>\u3053\u308c\u306f\u6a19\u6e96\u7684\u306a\u3084\u308a\u65b9\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u591a\u304f\u306e\u958b\u767a\u8005\u304c\u4f8b\u5916\u3068\u30a8\u30e9\u30fc\u3092\u3054\u3063\u3061\u3083\u306b\u3057\u3066\u3057\u307e\u3046\u539f\u56e0\u306e\u4e00\u3064\u3067\u3082\u3042\u308a\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u52b9\u7387\u5316\u306e\u305f\u3081\u306b\u7701\u7565\u5f62\u3092\u4f7f\u3046\u306b\u3057\u3066\u3082\u3001\u57fa\u672c\u3092\u77e5\u3063\u3066\u304a\u304f\u3053\u3068\u304c\u809d\u8981\u3067\u3059\u3002<\/p>\n<h2>JavaScript\u306e\u30a8\u30e9\u30fc\u306e\u7a2e\u985e<\/h2>\n<p>JavaScript\u306b\u306f\u3001\u3042\u3089\u304b\u3058\u3081\u5b9a\u7fa9\u3055\u308c\u305f\u3055\u307e\u3056\u307e\u306a\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u660e\u793a\u7684\u306b\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u3092\u884c\u3044\u9650\u308a\u3001JavaScript\u30e9\u30f3\u30bf\u30a4\u30e0\u306b\u3088\u3063\u3066\u81ea\u52d5\u7684\u306b\u9078\u629e\u3001\u5b9a\u7fa9\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u7d9a\u3044\u3066\u306f\u3001JavaScript\u3067\u6700\u3082\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u3001\u305d\u3057\u3066\u3001\u305d\u308c\u305e\u308c\u304c\u3044\u3064\u3001\u3069\u306e\u3088\u3046\u306a\u7406\u7531\u3067\u767a\u751f\u3059\u308b\u306e\u304b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>RangeError<\/h3>\n<p>RangeError\u306f\u3001\u5909\u6570\u306b\u6709\u52b9\u306a\u5024\u306e\u7bc4\u56f2\u5916\u306b\u3042\u308b\u5024\u304c\u8a2d\u5b9a\u3055\u308c\u305f\u3068\u304d\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u901a\u5e38\u3001\u95a2\u6570\u306b\u5f15\u6570\u3068\u3057\u3066\u5024\u3092\u6e21\u3059\u3068\u304d\u306b\u767a\u751f\u3057\u3001\u4e0e\u3048\u3089\u308c\u305f\u5024\u304c\u95a2\u6570\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u7bc4\u56f2\u5185\u306b\u306a\u3044\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002\u6b63\u3057\u3044\u5024\u3092\u6e21\u3059\u305f\u3081\u306b\u306f\u3001\u5f15\u6570\u306b\u53d6\u308a\u5f97\u308b\u5024\u306e\u7bc4\u56f2\u3092\u77e5\u308b\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081\u3001\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304c\u4e0d\u5341\u5206\u306a\u5834\u5408\u3001\u3053\u306e\u30a8\u30e9\u30fc\u306e\u89e3\u6c7a\u306b\u306f\u624b\u9593\u304c\u304b\u304b\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>RangeError\u304c\u767a\u751f\u3059\u308b\u4e00\u822c\u7684\u306a\u30d1\u30bf\u30fc\u30f3\u3092\u3001\u4ee5\u4e0b\u306b\u8907\u6570\u793a\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>Array\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u4e0d\u6b63\u306a\u9577\u3055\u306e\u914d\u5217\u3092\u4f5c\u6210\u3057\u3088\u3046\u3068\u3057\u305f<\/li>\n<li><code>toExponential()<\/code>\u3001<code>toPrecision()<\/code>\u3001<code>toFixed()<\/code>\u306a\u3069\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u4e0d\u6b63\u306a\u5024\u3092\u6e21\u3057\u305f<\/li>\n<li><code>normalize()<\/code>\u306e\u3088\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u306b\u4e0d\u6b63\u306a\u5024\u3092\u6e21\u3057\u305f<\/li>\n<\/ul>\n<h3>ReferenceError<\/h3>\n<p>ReferenceError\u306f\u3001\u30b3\u30fc\u30c9\u5185\u306e\u5909\u6570\u306e\u53c2\u7167\u306b\u4f55\u304b\u3057\u3089\u306e\u554f\u984c\u304c\u3042\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u5909\u6570\u3092\u4f7f\u7528\u3059\u308b\u524d\u306b\u5024\u3092\u5b9a\u7fa9\u3059\u308b\u306e\u3092\u5fd8\u308c\u305f\u304b\u3001\u307e\u305f\u306f\u30b3\u30fc\u30c9\u3067\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u5909\u6570\u3092\u4f7f\u7528\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3044\u305a\u308c\u306b\u3057\u3066\u3082\u3001\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3067\u3001\u554f\u984c\u306e\u3042\u308b\u5909\u6570\u306e\u53c2\u7167\u3092\u898b\u3064\u3051\u3001\u4fee\u6b63\u306b\u3042\u305f\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>ReferenceError\u304c\u767a\u751f\u3059\u308b\u4e00\u822c\u7684\u306a\u7406\u7531\u3068\u3057\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u5909\u6570\u540d\u306e\u30bf\u30a4\u30d7\u30df\u30b9\u3092\u3057\u305f<\/li>\n<li>\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u306e\u5909\u6570\u306b\u30b9\u30b3\u30fc\u30d7\u5916\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u305f<\/li>\n<li>\u8aad\u307f\u8fbc\u307f\u524d\u306b\u3001\u5916\u90e8\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\uff08<a href=\"https:\/\/kinsta.com\/blog\/jquery-is-not-defined\/\">jQuery\u306e$\u306a\u3069<\/a>\uff09\u3092\u53c2\u7167\u3057\u3088\u3046\u3068\u3057\u305f<\/li>\n<\/ul>\n<h3>SyntaxError<\/h3>\n<p>\u30b3\u30fc\u30c9\u306e\u69cb\u6587\u306b\u8aa4\u308a\u304c\u3042\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u4fee\u6b63\u3059\u308b\u306e\u304c\u6700\u3082\u7c21\u5358\u306a\u3082\u306e\u306e1\u3064\u3067\u3059\u3002JavaScript\u306f\uff08\u30b3\u30f3\u30d1\u30a4\u30e9\u3067\u306f\u306a\u304f\uff09<a href=\"https:\/\/kinsta.com\/blog\/scripting-languages\/\">\u30b9\u30af\u30ea\u30d7\u30c8\u8a00\u8a9e<\/a>\u3067\u3059\u306e\u3067\u3001\u30b9\u30af\u30ea\u30d7\u30c8\u306b\u3042\u308b\u30a8\u30e9\u30fc\u304c\u3042\u308b\u3068\u3001\u5b9f\u884c\u6642\u306b\u3001\u3053\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002\u30b3\u30f3\u30d1\u30a4\u30eb\u8a00\u8a9e\u3067\u306f\u3001\u3053\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u767a\u898b\u3055\u308c\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30a8\u30e9\u30fc\u304c\u89e3\u6c7a\u3055\u308c\u308b\u307e\u3067\u3001\u30a2\u30d7\u30ea\u306e\u30d0\u30a4\u30ca\u30ea\u306f\u4f5c\u6210\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>SyntaxErrors\u304c\u767a\u751f\u3059\u308b\u4e00\u822c\u7684\u306a\u7406\u7531\u306b\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u9006\u30b3\u30f3\u30de\u306e\u6b20\u843d<\/li>\n<li>\u62ec\u5f27\u306e\u9589\u3058\u306e\u6b20\u843d<\/li>\n<li>\u4e2d\u62ec\u5f27\u3084\u4ed6\u306e\u6587\u5b57\u306e\u4e0d\u9069\u5207\u306a\u5229\u7528<\/li>\n<\/ul>\n<p>\u30ea\u30f3\u30bf\u30fc\u3092\u4f7f\u3063\u3066\u3001\u3053\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u3092\u65e9\u671f\u767a\u898b\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u306e\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n<h3>TypeError<\/h3>\n<p>TypeError\u306f\u3001JavaScript\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u6700\u3082\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u306e\u4e00\u3064\u3067\u3059\u3002\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u3042\u308b\u5024\u304c\u7279\u5b9a\u306e\u60f3\u5b9a\u3055\u308c\u305f\u578b\u3067\u306a\u3044\u3053\u3068\u304c\u5224\u660e\u3057\u305f\u3068\u304d\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u3088\u304f\u3042\u308b\u30b1\u30fc\u30b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u30e1\u30bd\u30c3\u30c9\u3067\u306a\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u547c\u3073\u51fa\u3057\u305f<\/li>\n<li>null\u307e\u305f\u306fundefined\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u305f<\/li>\n<li>\u6587\u5b57\u5217\u3092\u6570\u5024\u3068\u3057\u3066\u6271\u3063\u305f\uff08\u307e\u305f\u306f\u305d\u306e\u9006\uff09<\/li>\n<\/ul>\n<p>TypeError\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u306f\u4ed6\u306b\u3082\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u3002\u3053\u308c\uff08\u305d\u3057\u3066\u5bfe\u7b56\u3082\uff09\u306b\u3064\u3044\u3066\u306f\u3001\u5f8c\u3067\u89e6\u308c\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n<h3>InternalError<\/h3>\n<p>InternalError\u306f\u3001JavaScript\u306e\u30e9\u30f3\u30bf\u30a4\u30e0\u30a8\u30f3\u30b8\u30f3\u3067\u4f8b\u5916\u304c\u767a\u751f\u3057\u305f\u3068\u304d\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u30b3\u30fc\u30c9\u306e\u554f\u984c\u3092\u610f\u5473\u3059\u308b\u3053\u3068\u3082\u3001\u305d\u3046\u3067\u306a\u3044\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e3b\u306b\u3001InternalError\u306f\u4ee5\u4e0b\u306e2\u3064\u306e\u72b6\u6cc1\u3067\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>JavaScript\u30e9\u30f3\u30bf\u30a4\u30e0\u306e\u30d1\u30c3\u30c1\u3084\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306b\u4f8b\u5916\u3092\u8fd4\u3059\u30d0\u30b0\u304c\u3042\u308b\uff08\u3053\u308c\u306f\u7a00\u3067\u306f\u3042\u308a\u307e\u3059\u304c\uff09<\/li>\n<li>JavaScript\u30a8\u30f3\u30b8\u30f3\u306b\u3068\u3063\u3066\u5927\u304d\u3059\u304e\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u30b3\u30fc\u30c9\u5185\u306b\u5b58\u5728\u3059\u308b\uff08\u4f8b\uff1aswitch\u6587\u306ecase\u306e\u5206\u5c90\u304c\u591a\u3059\u304e\u308b\u3001\u914d\u5217\u521d\u671f\u5316\u5b50\u304c\u5927\u304d\u3059\u304e\u308b\u3001\u518d\u5e30\u304c\u591a\u3059\u304e\u308b\uff09<\/li>\n<\/ul>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3059\u308b\u7406\u60f3\u7684\u306a\u65b9\u6cd5\u306f\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304b\u3089\u539f\u56e0\u3092\u7279\u5b9a\u3057\u3001\u53ef\u80fd\u3067\u3042\u308c\u3070\u30a2\u30d7\u30ea\u306e\u30ed\u30b8\u30c3\u30af\u3092\u518d\u69cb\u7bc9\u3057\u3066\u3001JavaScript\u30a8\u30f3\u30b8\u30f3\u306e\u4f5c\u696d\u8ca0\u8377\u304c\u6025\u6fc0\u306b\u4e0a\u6607\u3057\u3066\u3057\u307e\u3046\u306e\u3092\u907f\u3051\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<h3>URIError<\/h3>\n<p>URIError\u306f\u3001<code>decodeURIComponent<\/code>\u306e\u3088\u3046\u306a\u30b0\u30ed\u30fc\u30d0\u30eb\u306aURI\u51e6\u7406\u95a2\u6570\u304c\u9593\u9055\u3063\u305f\u65b9\u6cd5\u3067\u4f7f\u7528\u3055\u308c\u305f\u3068\u304d\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u901a\u5e38\u3001\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u306b\u6e21\u3055\u308c\u305f\u30d1\u30e9\u30e1\u30fc\u30bf\u304cURI\u6a19\u6e96\u306b\u6e96\u62e0\u3057\u3066\u304a\u3089\u305a\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/defer-parsing-of-javascript\/\">\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u3063\u3066\u9069\u5207\u306b\u30d1\u30fc\u30b9<\/a>\u3055\u308c\u306a\u304b\u3063\u305f\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<p>\u901a\u5e38\u3001\u5f15\u6570\u306b\u554f\u984c\u304c\u306a\u3044\u304b\u3092\u8abf\u3079\u308b\u3060\u3051\u3067\u5bfe\u51e6\u3067\u304d\u308b\u306e\u3067\u7c21\u5358\u3067\u3059\u3002<\/p>\n<h3>EvalError<\/h3>\n<p>EvalError\u306f\u3001<code>eval()<\/code>\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\u3067\u554f\u984c\u304c\u767a\u751f\u3057\u305f\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<code>eval()<\/code>\u95a2\u6570\u306f\u3001\u6587\u5b57\u5217\u306b\u683c\u7d0d\u3055\u308c\u305fJavaScript\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u306e\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u3001<code>eval()<\/code>\u95a2\u6570\u306e\u4f7f\u7528\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u554f\u984c\u304b\u3089\u63a8\u5968\u3055\u308c\u3066\u304a\u3089\u305a\u3001\u73fe\u5728\u306eECMAScript\u306e\u4ed5\u69d8\u3067\u306f<code>EvalError<\/code>\u30af\u30e9\u30b9\u306f\u8fd4\u3055\u308c\u306a\u3044\u305f\u3081\u3001\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3042\u304f\u307e\u3067\u3082\u53e4\u3044JavaScript\u30b3\u30fc\u30c9\u3068\u306e\u5f8c\u65b9\u4e92\u63db\u6027\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u5b58\u5728\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u53e4\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306eJavaScript\u3067\u4f5c\u696d\u3057\u3066\u3044\u308b\u3068\u3001\u3053\u306e\u30a8\u30e9\u30fc\u306b\u906d\u9047\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3044\u305a\u308c\u306b\u305b\u3088\u3001<code>eval()<\/code>\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\u3067\u5b9f\u884c\u3055\u308c\u305f\u30b3\u30fc\u30c9\u306b\u4f8b\u5916\u304c\u306a\u3044\u304b\u3069\u3046\u304b\u8abf\u67fb\u3059\u308b\u306e\u304c\u5f97\u7b56\u3067\u3059\u3002<\/p>\n<h2>\u72ec\u81ea\u306e\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u306e\u4f5c\u6210<\/h2>\n<p>JavaScript\u306b\u306f\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u3001\u307b\u3068\u3093\u3069\u306e\u72b6\u6cc1\u3092\u7db2\u7f85\u3067\u304d\u308b\u3060\u3051\u306e\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u5fc5\u8981\u3067\u3042\u308c\u3070\u3001\u305d\u306e\u4ed6\u306b\u3082\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u67d4\u8edf\u6027\u3092\u652f\u3048\u308b\u306e\u304c\u3001JavaScript\u304c<code>throw<\/code>\u30b3\u30de\u30f3\u30c9\u3067\u6587\u5b57\u901a\u308a\u4f55\u3067\u3082\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u3044\u3046\u6027\u8cea\u3067\u3059\u3002<\/p>\n<p>\u6280\u8853\u7684\u306b\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306f\u5b8c\u5168\u306b\u6709\u52b9\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-js\">throw 8\nthrow \"An error occurred\"<\/code><\/pre>\n<p>\u3057\u304b\u3057\u3001\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3067\u306f\u3001\u305d\u306e\u578b\u3084\u540d\u524d\u3001\u4ed8\u968f\u3059\u308b\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306a\u3069\u3001\u30a8\u30e9\u30fc\u306e\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u308f\u304b\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u306b\u5bfe\u51e6\u3057\u3001\u30d7\u30ed\u30bb\u30b9\u3092\u6a19\u6e96\u5316\u3059\u308b\u305f\u3081\u306b\u3001<code>Error<\/code>\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u3059\u3002\u5c1a\u3001\u4f8b\u5916\u3092\u8868\u793a\u3059\u308b\u969b\u306b\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<p><code>Error<\/code>\u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3057\u3066\u3001\u72ec\u81ea\u306e\u30a8\u30e9\u30fc\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u57fa\u672c\u7684\u306a\u4f8b\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-js\">class ValidationError extends Error {\n    constructor(message) {\n        super(message);\n        this.name = \"ValidationError\";\n    }\n}<\/code><\/pre>\n<p>\u3053\u308c\u3092\u3001\u6b21\u306e\u3088\u3046\u306b\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">throw ValidationError(\"Property not found: name\")<\/code><\/pre>\n<p>\u305d\u3057\u3066<code>instanceof<\/code>\u30ad\u30fc\u30ef\u30fc\u30c9\u3068\u7d44\u307f\u5408\u308f\u305b\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">try {\n    validateForm() \/\/ code that throws a ValidationError\n} catch (e) {\n    if (e instanceof ValidationError)\n    \/\/ do something\n    else\n    \/\/ do something else\n}<\/code><\/pre>\n<h2>JavaScript\u306e\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc10\u9078<\/h2>\n<p>\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u3068\u3001\u72ec\u81ea\u306e\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u306e\u4f5c\u6210\u65b9\u6cd5\u3092\u7406\u89e3\u3057\u305f\u3068\u3053\u308d\u3067\u3001\u6b21\u306fJavaScript\u306e\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3068\u304d\u306b\u76f4\u9762\u3057\u304c\u3061\u306a\u30a8\u30e9\u30fc\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u3088\u304f\u3042\u308bJavaScript\u306e\u30a8\u30e9\u30fc\u306b\u3064\u3044\u3066<a href=\"https:\/\/www.youtube.com\/watch?v=IXrqv7Szv_g\">\u52d5\u753b\u3067\u306e\u89e3\u8aac<\/a>\u3082\u3054\u7528\u610f\u3057\u3066\u3044\u307e\u3059\u3002<\/h3>\n<kinsta-video src=\"https:\/\/www.youtube.com\/watch?v=IXrqv7Szv_g\"><\/kinsta-video>\n<h3>1. Uncaught RangeError<\/h3>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001Google Chrome\u3092\u4f7f\u7528\u4e2d\u306b\u3001\u3044\u304f\u3064\u304b\u306e\u72b6\u6cc1\u4e0b\u3067\u767a\u751f\u3057\u307e\u3059\u3002\u307e\u305a\u3001\u518d\u5e30\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u305f\u3082\u306e\u306e\u7d42\u4e86\u3057\u306a\u3044\u30b1\u30fc\u30b9\u3067\u3059\u3002\u3053\u308c\u306f\u3001Chrome Developer Console\u3067\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110241\" aria-describedby=\"caption-attachment-110241\" style=\"width: 1392px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110241 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/recur-range-error.png\" alt=\"\u518d\u5e30\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\u306b\u95a2\u9023\u3057\u305fRangeError\u306e\u4f8b\" width=\"1392\" height=\"492\"><figcaption id=\"caption-attachment-110241\" class=\"wp-caption-text\">\u518d\u5e30\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\u306b\u95a2\u9023\u3057\u305fRangeError\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u3053\u308c\u3092\u89e3\u6c7a\u3059\u308b\u306b\u306f\u3001\u518d\u5e30\u95a2\u6570\u3092\u6253\u3061\u5207\u308b\u30dd\u30a4\u30f3\u30c8\u3092\u6b63\u3057\u304f\u5b9a\u7fa9\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u3053\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3082\u3046\u4e00\u3064\u306e\u30d1\u30bf\u30fc\u30f3\u3068\u3057\u3066\u3001\u95a2\u6570\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u7bc4\u56f2\u5916\u306e\u5024\u3092\u6e21\u3057\u3066\u3057\u307e\u3063\u305f\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u304c\u305d\u306e\u4f8b\u3067\u3059\u3002<\/p>\n<figure id=\"attachment_110239\" aria-describedby=\"caption-attachment-110239\" style=\"width: 1392px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110239 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/toExponential-range-error.png\" alt=\"toExponential()\u547c\u3073\u51fa\u3057\u306b\u95a2\u9023\u3057\u305fRangeError\u306e\u4f8b\" width=\"1392\" height=\"150\"><figcaption id=\"caption-attachment-110239\" class=\"wp-caption-text\">toExponential()\u547c\u3073\u51fa\u3057\u306b\u95a2\u9023\u3057\u305fRangeError\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u901a\u5e38\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u306f\u3001\u30b3\u30fc\u30c9\u306e\u3069\u3053\u306b\u554f\u984c\u304c\u3042\u308b\u306e\u304b\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u7b87\u6240\u3092\u4fee\u6b63\u3059\u308c\u3070\u3001\u554f\u984c\u306f\u89e3\u6c7a\u3059\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n<figure id=\"attachment_110240\" aria-describedby=\"caption-attachment-110240\" style=\"width: 1396px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110240 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/toExponential-error-fixed.png\" alt=\" toExponential()\u95a2\u6570\u547c\u3073\u51fa\u3057\u306e\u51fa\u529b\" width=\"1396\" height=\"100\"><figcaption id=\"caption-attachment-110240\" class=\"wp-caption-text\">toExponential()\u95a2\u6570\u547c\u3073\u51fa\u3057\u306e\u51fa\u529b<\/figcaption><\/figure>\n<h3>2. Uncaught TypeError: Cannot set property<\/h3>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u672a\u5b9a\u7fa9\u306e\u53c2\u7167\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8a2d\u5b9a\u3057\u3088\u3046\u3068\u3057\u305f\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u3053\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-js\">var list\nlist.count = 0<\/code><\/pre>\n<p>\u51fa\u529b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110245\" aria-describedby=\"caption-attachment-110245\" style=\"width: 1392px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110245 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/list-count-type-error.png\" alt=\"TypeError\u306e\u4f8b\" width=\"1392\" height=\"124\"><figcaption id=\"caption-attachment-110245\" class=\"wp-caption-text\">TypeError\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3059\u308b\u306b\u306f\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u524d\u306b\u3001\u53c2\u7167\u3092\u5024\u3067\u521d\u671f\u5316\u3057\u307e\u3059\u3002\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110246\" aria-describedby=\"caption-attachment-110246\" style=\"width: 1392px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110246 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/list-count-fixed.png\" alt=\"TypeError\u306e\u89e3\u6c7a\u65b9\u6cd5\" width=\"1392\" height=\"124\"><figcaption id=\"caption-attachment-110246\" class=\"wp-caption-text\">TypeError\u306e\u89e3\u6c7a\u65b9\u6cd5<\/figcaption><\/figure>\n<h3>3. Uncaught TypeError: Cannot read property<\/h3>\n<p>\u3053\u308c\u306f\u3001JavaScript\u3067\u6700\u3082\u3088\u304f\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u306e\u4e00\u3064\u3067\u3059\u3002\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u672a\u5b9a\u7fa9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8aad\u307f\u8fbc\u3093\u3060\u308a\u3001\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u305f\u308a\u3057\u3088\u3046\u3068\u3057\u305f\u3068\u304d\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002Chrome Developer\u30b3\u30f3\u30bd\u30fc\u30eb\u3067\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u3053\u306e\u30a8\u30e9\u30fc\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">var func\nfunc.call()<\/code><\/pre>\n<p>\u51fa\u529b\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<figure id=\"attachment_110249\" aria-describedby=\"caption-attachment-110249\" style=\"width: 1100px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110249 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/func-call-type-error.png\" alt=\"\u672a\u5b9a\u7fa9\u306e\u95a2\u6570\u306b\u95a2\u9023\u3057\u305fTypeError\u306e\u4f8b\" width=\"1100\" height=\"162\"><figcaption id=\"caption-attachment-110249\" class=\"wp-caption-text\">\u672a\u5b9a\u7fa9\u306e\u95a2\u6570\u306b\u95a2\u9023\u3057\u305fTypeError\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306b\u306f\u6570\u591a\u304f\u306e\u539f\u56e0\u304c\u8003\u3048\u3089\u308c\u307e\u3059\u304c\u3001\u305d\u306e\u4e2d\u306e\u4e00\u3064\u304c\u672a\u5b9a\u7fa9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002\u307e\u305f\u3001UI\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u6642\u306bstate\u306e\u521d\u671f\u5316\u304c\u3046\u307e\u304f\u3044\u3063\u3066\u3044\u306a\u3044\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002React\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u5b9f\u969b\u306e\u4f8b\u304c\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-js\">import React, { useState, useEffect } from \"react\";\n\nconst CardsList = () =&gt; {\n\n    const [state, setState] = useState();\n\n    useEffect(() =&gt; {\n        setTimeout(() =&gt; setState({ items: [\"Card 1\", \"Card 2\"] }), 2000);\n    }, []);\n\n    return (\n        &lt;&gt;\n            {state.items.map((item) =&gt; (\n                &lt;li key={item}&gt;{item}&lt;\/li&gt;\n            ))}\n        &lt;\/&gt;\n    );\n};\n\nexport default CardsList;<\/code><\/pre>\n<p>\u30a2\u30d7\u30ea\u306f\u7a7a\u306estate\u30b3\u30f3\u30c6\u30ca\u304b\u3089\u59cb\u307e\u308a\u30012\u79d2\u9593\u306e\u9045\u5ef6\u306e\u5f8c\u3001\u8907\u6570\u306e\u30a2\u30a4\u30c6\u30e0\u304c\u63d0\u4f9b\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u9045\u5ef6\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u547c\u3073\u51fa\u3057\u3092\u6a21\u5023\u3059\u308b\u305f\u3081\u306b\u8a2d\u3051\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304c\u8d85\u9ad8\u901f\u3067\u3042\u3063\u3066\u3082\u3001\u308f\u305a\u304b\u306a\u9045\u5ef6\u304c\u767a\u751f\u3059\u308b\u305f\u3081\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u5c11\u306a\u304f\u3068\u30821\u56de\u306f\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30a2\u30d7\u30ea\u3092\u5b9f\u884c\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u6b21\u306e\u30a8\u30e9\u30fc\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110234\" aria-describedby=\"caption-attachment-110234\" style=\"width: 1180px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110234 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/undefined-type-error-output.png\" alt=\"\u30d6\u30e9\u30a6\u30b6\u3067TypeError\u306e\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3092\u8868\u793a\" width=\"1180\" height=\"576\"><figcaption id=\"caption-attachment-110234\" class=\"wp-caption-text\">\u30d6\u30e9\u30a6\u30b6\u3067TypeError\u306e\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3092\u8868\u793a<\/figcaption><\/figure>\n<p>\u3053\u308c\u306f\u3001\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u6642\u306bstate\u30b3\u30f3\u30c6\u30ca\u304c\u672a\u5b9a\u7fa9\u3067\u3042\u308a\u3001\u305d\u3053\u306b\u30d7\u30ed\u30d1\u30c6\u30a3<code>items<\/code>\u304c\u5b58\u5728\u3057\u306a\u3044\u3053\u3068\u304c\u539f\u56e0\u3067\u3059\u3002\u3053\u306e\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3059\u308b\u306e\u306f\u7c21\u5358\u3067\u3059\u3002state\u30b3\u30f3\u30c6\u30ca\u306b\u521d\u671f\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre><code class=\"language-js\">\/\/ ...\nconst [state, setState] = useState({items: []});\n\/\/ ...<\/code><\/pre>\n<p>\u3053\u308c\u3067\u3001\u8a2d\u5b9a\u3057\u305f\u9045\u5ef6\u6642\u9593\u304c\u7d4c\u904e\u3059\u308b\u3068\u3001\u30a2\u30d7\u30ea\u3067\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u51fa\u529b\u304c\u5b9f\u884c\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110251\" aria-describedby=\"caption-attachment-110251\" style=\"width: 1180px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110251 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/cards-list-output.png\" alt=\"\u30b3\u30fc\u30c9\u306e\u51fa\u529b\" width=\"1180\" height=\"576\"><figcaption id=\"caption-attachment-110251\" class=\"wp-caption-text\">\u30b3\u30fc\u30c9\u306e\u51fa\u529b<\/figcaption><\/figure>\n<p>\u30b3\u30fc\u30c9\u3054\u3068\u306b\u5177\u4f53\u7684\u306a\u4fee\u6b63\u306e\u3057\u304b\u305f\u306f\u7570\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u3053\u3053\u3067\u5927\u4e8b\u306a\u306e\u306f\u3001\u5909\u6570\u3092\u4f7f\u7528\u3059\u308b\u524d\u306b\u9069\u5207\u306b\u521d\u671f\u5316\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<h3>4. TypeError: &#8216;undefined&#8217; is not an object<\/h3>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001Safari\u3067\u672a\u5b9a\u7fa9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u305f\u3068\u304d\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u305d\u3046\u3068\u3057\u305f\u3068\u304d\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u4e0a\u8a18\u3068\u540c\u3058\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308c\u3070\u3001\u3053\u306e\u30a8\u30e9\u30fc\u304c\u78ba\u8a8d\u3067\u304d\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n<figure id=\"attachment_110250\" aria-describedby=\"caption-attachment-110250\" style=\"width: 1146px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110250 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/func-call-type-error-undefined.png\" alt=\"\u95a2\u6570\u304c\u672a\u5b9a\u7fa9\u3067\u3042\u308b\u3053\u3068\u306b\u95a2\u9023\u3057\u305fTypeError\u306e\u4f8b\" width=\"1146\" height=\"172\"><figcaption id=\"caption-attachment-110250\" class=\"wp-caption-text\">\u95a2\u6570\u304c\u672a\u5b9a\u7fa9\u3067\u3042\u308b\u3053\u3068\u306b\u95a2\u9023\u3057\u305fTypeError\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306e\u89e3\u6c7a\u65b9\u6cd5\u3082\u540c\u3058\u3067\u3059\u3002\u5909\u6570\u3092\u6b63\u3057\u304f\u521d\u671f\u5316\u3057\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u3068\u304d\u306b\u5909\u6570\u304c\u672a\u5b9a\u7fa9\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>5. TypeError: null is not an object<\/h3>\n<p>\u3053\u308c\u3082\u307e\u305f\u3001\u5148\u306e\u30a8\u30e9\u30fc\u3068\u540c\u69d8\u3067\u3059\u3002\u552f\u4e00\u306e\u9055\u3044\u306f\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u307e\u305f\u306f\u30e1\u30bd\u30c3\u30c9\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c<code>undefined<\/code>\u3067\u306f\u306a\u304f<code>null<\/code>\u3067\u3042\u308b\u3053\u3068\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u3001\u3053\u306e\u30a8\u30e9\u30fc\u3092\u518d\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">var func = null\n\nfunc.call()<\/code><\/pre>\n<p>\u4ee5\u4e0b\u304c\u3001\u305d\u306e\u51fa\u529b\u3067\u3059\u3002<\/p>\n<figure id=\"attachment_110243\" aria-describedby=\"caption-attachment-110243\" style=\"width: 1146px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110243 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/null-object-error.png\" alt=\"null\u95a2\u6570\u306b\u3088\u308bTypeError\u306e\u4f8b\" width=\"1146\" height=\"142\"><figcaption id=\"caption-attachment-110243\" class=\"wp-caption-text\">null\u95a2\u6570\u306b\u3088\u308bTypeError\u306e\u4f8b<\/figcaption><\/figure>\n<p><code>null<\/code>\u306f\u660e\u793a\u7684\u306b\u5909\u6570\u306b\u8a2d\u5b9a\u3055\u308c\u305f\u5024\u3067\u3042\u308a\u3001\u81ea\u52d5\u3067\u4ee3\u5165\u3055\u308c\u308b\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u81ea\u5206\u3067<code>null<\/code>\u3092\u8a2d\u5b9a\u3057\u305f\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u305f\u5834\u5408\u306e\u307f\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u81ea\u5206\u306e\u66f8\u3044\u305f\u30ed\u30b8\u30c3\u30af\u304c\u6b63\u3057\u3044\u304b\u3069\u3046\u304b\u3001\u3082\u3046\u4e00\u5ea6\u898b\u76f4\u3057\u3066\u307f\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>6. TypeError: Cannot read property &#8216;length&#8217;<\/h3>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001Chrome\u3067<code>null<\/code>\u307e\u305f\u306f<code>undefined<\/code>\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u9577\u3055\u3092\u8aad\u307f\u53d6\u308d\u3046\u3068\u3057\u305f\u3068\u304d\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u554f\u984c\u306e\u539f\u56e0\u306f\u3001\u3053\u308c\u307e\u3067\u306e\u554f\u984c\u3068\u540c\u69d8\u3067\u3059\u304c\u3001\u914d\u5217\u3092\u51e6\u7406\u3059\u308b\u969b\u306b\u983b\u7e41\u306b\u767a\u751f\u3059\u308b\u305f\u3081\u3001\u7279\u7b46\u306b\u5024\u3057\u307e\u3059\u3002\u3053\u306e\u554f\u984c\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110244\" aria-describedby=\"caption-attachment-110244\" style=\"width: 937px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110244 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/myButton-length-type-error.png\" alt=\"\u672a\u5b9a\u7fa9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u305fTypeError\u306e\u4f8b\" width=\"937\" height=\"230\"><figcaption id=\"caption-attachment-110244\" class=\"wp-caption-text\">\u672a\u5b9a\u7fa9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u305fTypeError\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u3057\u304b\u3057\u3001\u65b0\u3057\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306eChrome\u3067\u306f\u3001\u3053\u306e\u30a8\u30e9\u30fc\u306f<code>Uncaught TypeError: Cannot read properties of undefined<\/code>\u3068\u3057\u3066\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110247\" aria-describedby=\"caption-attachment-110247\" style=\"width: 1400px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110247 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/length-type-error.png\" alt=\"\u672a\u5b9a\u7fa9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u305fTypeError\u306e\u4f8b\uff08\u65b0\u3057\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306eChrome\u3067\u8868\u793a\uff09\" width=\"1400\" height=\"174\"><figcaption id=\"caption-attachment-110247\" class=\"wp-caption-text\">\u672a\u5b9a\u7fa9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u305fTypeError\u306e\u4f8b\uff08\u65b0\u3057\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306eChrome\u3067\u8868\u793a\uff09<\/figcaption><\/figure>\n<p>\u3053\u306e\u5834\u5408\u3082\u3001\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5b58\u5728\u3057\u3001NULL\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u306e\u304c\u89e3\u6c7a\u7b56\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>7. TypeError: &#8216;undefined&#8217; is not a function<\/h3>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u30b9\u30af\u30ea\u30d7\u30c8\u5185\u306b\u5b58\u5728\u3057\u306a\u3044\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u305d\u3046\u3068\u3057\u305f\u3068\u304d\u3001\u307e\u305f\u306f\u5b58\u5728\u3059\u308b\u3082\u306e\u306e\u3001\u547c\u3073\u51fa\u3057\u5074\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u53c2\u7167\u3067\u304d\u306a\u3044\u3068\u304d\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30a8\u30e9\u30fc\u306f\u901a\u5e38Google Chrome\u3067\u898b\u3089\u308c\u3001\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u3068\u306a\u3063\u3066\u3044\u308b\u30b3\u30fc\u30c9\u306e\u7b87\u6240\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3067\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002\u3082\u3057\u30bf\u30a4\u30d7\u30df\u30b9\u3092\u898b\u3064\u3051\u305f\u3089\u3001\u305d\u308c\u3092\u4fee\u6b63\u3057\u3001\u554f\u984c\u304c\u89e3\u6c7a\u3059\u308b\u304b\u3069\u3046\u304b\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u30b3\u30fc\u30c9\u5185\u3067\uff08\u81ea\u5df1\u53c2\u7167\u578b\u306e\u5909\u6570\u3067\u3042\u308b\uff09<code>this<\/code>\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\u306e\u6ce8\u610f\u70b9\u3067\u3059\u3002<code>this<\/code>\u304c\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u9069\u5207\u306b\u7d50\u3073\u3064\u3044\u3066\u3044\u306a\u3044\u3068\u3001\u3053\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u6b21\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre><code class=\"language-js\">function showAlert() {\n    alert(\"message here\")\n}\n\ndocument.addEventListener(\"click\", () =&gt; {\n    this.showAlert();\n})<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u8aac\u660e\u3057\u305f\u3088\u3046\u306a\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3068\u3057\u3066\u6e21\u3055\u308c\u305f\u7121\u540d\u95a2\u6570\u304c\u3001<code>document<\/code>\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u306b\u8d77\u3053\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3001\u95a2\u6570<code>showAlert<\/code>\u306f<code>window<\/code>\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u5b9a\u7fa9\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3092\u89e3\u6c7a\u3059\u308b\u306b\u306f<code>bind()<\/code>\u30e1\u30bd\u30c3\u30c9\u3067\u95a2\u6570\u3092\u7d10\u4ed8\u3051\u308b\u3053\u3068\u3067\u3001\u9069\u5207\u306b\u53c2\u7167\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">document.addEventListener(\"click\", this.showAlert.bind(this))<\/code><\/pre>\n<h3>8. ReferenceError: event is not defined<\/h3>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u547c\u3073\u51fa\u3057\u5143\u306e\u30b9\u30b3\u30fc\u30d7\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u53c2\u7167\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u305f\u3068\u304d\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u306e\u969b\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306e\u4e2d\u3067<code>event<\/code>\u3068\u3044\u3046\u53c2\u7167\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001\u3053\u306e\u3088\u3046\u306a\u3053\u3068\u304c\u8d77\u3053\u308a\u307e\u3059\u3002\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u95a2\u6570\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u3064\u3044\u3066event\u3068\u3044\u3046\u5f15\u6570\u3092\u5b9a\u7fa9\u3057\u5fd8\u308c\u305f\u308a\u3001\u30b9\u30da\u30eb\u3092\u9593\u9055\u3048\u305f\u308a\u3057\u305f\u5834\u5408\u306b\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001Internet Explorer\u3084Google Chrome\u3067\u306f\u767a\u751f\u3057\u306a\u3044\u306f\u305a\u3067\u3059\u304c\uff08IE\u306b\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u30a4\u30d9\u30f3\u30c8\u5909\u6570\u304c\u3042\u308a\u3001Chrome\u306f\u30a4\u30d9\u30f3\u30c8\u5909\u6570\u3092\u81ea\u52d5\u7684\u306b\u30cf\u30f3\u30c9\u30e9\u306b\u7d10\u4ed8\u3051\u308b\u305f\u3081\uff09\u3001Firefox\u3067\u306f\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3067\u3059\u306e\u3067\u3001\u3053\u306e\u3088\u3046\u306a\u5c0f\u3055\u306a\u30df\u30b9\u306b\u6ce8\u610f\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n<h3>9. TypeError: Assignment to constant variable<\/h3>\n<p>\u3053\u308c\u306f\u4e0d\u6ce8\u610f\u304b\u3089\u8d77\u3053\u308b\u30a8\u30e9\u30fc\u3067\u3059\u3002\u5b9a\u6570\u306b\u5225\u306e\u5024\u3092\u4ee3\u5165\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u3053\u306e\u3088\u3046\u306a\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110248\" aria-describedby=\"caption-attachment-110248\" style=\"width: 1392px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110248 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/func-type-error.png\" alt=\"\u5b9a\u6570\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5272\u308a\u5f53\u3066\u306b\u95a2\u9023\u3057\u305fTypeError\u306e\u4f8b\" width=\"1392\" height=\"124\"><figcaption id=\"caption-attachment-110248\" class=\"wp-caption-text\">\u5b9a\u6570\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5272\u308a\u5f53\u3066\u306b\u95a2\u9023\u3057\u305fTypeError\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u4fee\u6b63\u306f\u4e00\u898b\u3059\u308b\u3068\u7c21\u5358\u306a\u3088\u3046\u3067\u3059\u304c\u3001\u4f55\u767e\u3082\u306e\u3053\u306e\u3088\u3046\u306a\u5909\u6570\u5ba3\u8a00\u304c\u3042\u308a\u3001\u305d\u306e\u3046\u3061\u306e\u3072\u3068\u3064\u304c\u8aa4\u3063\u3066<code>let<\/code>\u3067\u306f\u306a\u304f<code>const<\/code>\u3068\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<a href=\"https:\/\/kinsta.com\/blog\/php-vs-javascript\/#variable-and-constant-definitions\">PHP\u306a\u3069\u306e\u4ed6\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u8a00\u8a9e\u3068\u9055\u3044<\/a>\u3001JavaScript\u3067\u306f\u5b9a\u6570\u3068\u5909\u6570\u306e\u5ba3\u8a00\u306e\u30b9\u30bf\u30a4\u30eb\u306b\u307b\u3068\u3093\u3069\u9055\u3044\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u3053\u306e\u30a8\u30e9\u30fc\u306b\u76f4\u9762\u3057\u305f\u5834\u5408\u306f\u3001\u307e\u305a\u5ba3\u8a00\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u53c2\u7167\u5148\u304c\u5b9a\u6570\u3067\u3042\u308b\u3053\u3068\u3092\u5fd8\u308c\u3066\u5909\u6570\u3068\u3057\u3066\u4f7f\u3063\u3066\u3057\u307e\u3063\u305f\u5834\u5408\u306b\u3082\u3001\u3053\u306e\u30a8\u30e9\u30fc\u304c\u8868\u793a\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u4e0d\u6ce8\u610f\u304b\u3001\u30a2\u30d7\u30ea\u306e\u30ed\u30b8\u30c3\u30af\u306b\u6b20\u9665\u304c\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3092\u91cd\u70b9\u7684\u306b\u610f\u8b58\u3057\u3066\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>10. (unknown): Script error<\/h3>\n<p>\u30b9\u30af\u30ea\u30d7\u30c8\u30a8\u30e9\u30fc\u306f\u3001\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u304b\u3089\u30d6\u30e9\u30a6\u30b6\u306b\u30a8\u30e9\u30fc\u304c\u9001\u4fe1\u3055\u308c\u305f\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30b9\u30af\u30ea\u30d7\u30c8\u306f\u3001\u500b\u3005\u306b\u958b\u767a\u4e2d\u306e\u30a2\u30d7\u30ea\u3068\u306f\u7570\u306a\u308b\u30c9\u30e1\u30a4\u30f3\u306b\u5c5e\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u3053\u306e\u30a8\u30e9\u30fc\u306b\u306f\u300c(unknown)\u300d\u304c\u4ed8\u3055\u308c\u307e\u3059\u3002\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u304b\u3089\u6a5f\u5bc6\u60c5\u5831\u304c\u6f0f\u308c\u308b\u306e\u3092\u9632\u3050\u305f\u3081\u306b\u3001\u30d6\u30e9\u30a6\u30b6\u3067\u306e\u305d\u306e\u4ed6\u306e\u8a73\u3057\u3044\u60c5\u5831\u306f\u975e\u8868\u793a\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u8a73\u7d30\u304c\u308f\u304b\u3089\u306a\u3044\u3068\u89e3\u6c7a\u3067\u304d\u307e\u305b\u3093\u3002\u305d\u3053\u3067\u3001\u3053\u306e\u30a8\u30e9\u30fc\u306b\u95a2\u3059\u308b\u8a73\u3057\u3044\u60c5\u5831\u3092\u7372\u5f97\u3059\u308b\u305f\u3081\u306b\u3067\u304d\u308b\u3053\u3068\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>script\u30bf\u30b0\u306b<code>crossorigin<\/code>\u5c5e\u6027\u3092\u4ed8\u4e0e\u3059\u308b<\/li>\n<li>script\u3092\u30db\u30b9\u30c8\u3057\u3066\u3044\u308b\u30b5\u30fc\u30d0\u30fc\u306b\u6b63\u3057\u3044<code>Access-Control-Allow-Origin<\/code>\u30d8\u30c3\u30c0\u3092\u8a2d\u5b9a\u3059\u308b<\/li>\n<li>\uff08\u4efb\u610f\uff09\u30b5\u30fc\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u5834\u5408\u3001\u30d7\u30ed\u30ad\u30b7\u3092\u4f7f\u7528\u3057\u3066\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u30b5\u30fc\u30d0\u30fc\u306b\u3064\u306a\u304e\u3001\u6b63\u3057\u3044\u30d8\u30c3\u30c0\u306e\u4ed8\u3055\u308c\u305f\u72b6\u614b\u3067\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u8fd4\u3059\u3053\u3068\u3082\u53ef\u80fd<\/li>\n<\/ol>\n<p>\u30a8\u30e9\u30fc\u306e\u8a73\u3057\u3044\u60c5\u5831\u304c\u308f\u304b\u3063\u305f\u3089\u3001\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u88fd\u30e9\u30a4\u30d6\u30e9\u30ea\u304b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u3069\u3061\u3089\u304b\u306e\u554f\u984c\u306b\u5bfe\u3057\u3066\u3001\u5177\u4f53\u7684\u306a\u7b56\u3092\u8b1b\u3058\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>JavaScript\u306e\u30a8\u30e9\u30fc\u306e\u7279\u5b9a\u3068\u9632\u6b62\u65b9\u6cd5<\/h2>\n<p>\u4e0a\u3067\u8aac\u660e\u3057\u305f\u30a8\u30e9\u30fc\u306f\u3001JavaScript\u3067\u3088\u304f\u898b\u3089\u308c\u308b\u3082\u306e\u3067\u3059\u304c\u3001\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u77e5\u3063\u3066\u304a\u304f\u3060\u3051\u3067\u306f\u5341\u5206\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002JavaScript\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u958b\u767a\u3059\u308b\u4e0a\u3067\u3001\u3069\u306e\u3088\u3046\u306b\u30a8\u30e9\u30fc\u3092\u691c\u51fa\u3057\u3001\u9632\u6b62\u3059\u308b\u304b\u3092\u7406\u89e3\u3057\u3066\u304a\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u305d\u3053\u3067\u3001JavaScript\u306e\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3>\u624b\u52d5\u3067\u30a8\u30e9\u30fc\u3092\u300cthrow\u300d\uff06\u300ccatch\u300d\u3059\u308b<\/h3>\n<p>\u624b\u52d5\u3067\u3001\u307e\u305f\u306f\u30e9\u30f3\u30bf\u30a4\u30e0\u306b\u3088\u3063\u3066\u8fd4\u3055\u308c\u305f\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u6700\u3082\u57fa\u672c\u7684\u306a\u65b9\u6cd5\u304c\u3001catch\u3067\u3059\u3002\u4ed6\u306e\u591a\u304f\u306e\u8a00\u8a9e\u3068\u540c\u69d8\u306b\u3001JavaScript\u306b\u306f\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u306b\u4f7f\u3048\u308b\u6a5f\u80fd\u304c\u3044\u304f\u3064\u3082\u3042\u308a\u307e\u3059\u3002JavaScript\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u306b\u3064\u3044\u3066\u8a71\u3059\u524d\u306b\u3001\u305d\u308c\u305e\u308c\u3092\u4f7f\u3063\u3066\u3067\u304d\u308b\u3053\u3068\u3092\u7406\u89e3\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4>throw<\/h4>\n<p>\u6700\u521d\u306b\u6271\u3046\u306e\u304c\u3001\u6700\u3082\u57fa\u672c\u7684\u306athrow\u3067\u3059\u3002\u540d\u524d\u304b\u3089\u3082\u660e\u3089\u304b\u306a\u3088\u3046\u306b\u3001<code>throw<\/code>\u306fJavaScript\u3067\u4f8b\u5916\u3092\u6295\u3052\u308b\u306e\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3064\u3044\u3066\u306f\u3001\u3059\u3067\u306b\u89e6\u308c\u305f\u3068\u304a\u308a\u3067\u3059\u304c\u3001\u3082\u3046\u5c11\u3057\u8a73\u3057\u304f\u5f79\u5272\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li>\u6570\u5024\u3001\u6587\u5b57\u5217\u3001<code>Error<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306a\u3069\u3001\u4f55\u3067\u3082<code>throw<\/code>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b<\/li>\n<li>\u3057\u304b\u3057\u3001\u6587\u5b57\u5217\u3084\u6570\u5024\u306a\u3069\u306e\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306f\u3001\u30a8\u30e9\u30fc\u306b\u95a2\u3059\u308b\u30c7\u30d0\u30c3\u30b0\u60c5\u5831\u3092\u6301\u305f\u306a\u3044\u305f\u3081\u3001\u6295\u3052\u308b\u306e\u306f\u5f97\u7b56\u3067\u306f\u306a\u3044<\/li>\n<li>\u4f8b\uff1a<code>throw TypeError(\"Please provide a string\")<\/code><\/li>\n<\/ul>\n<h4>try<\/h4>\n<p><code>try<\/code>\u306f\u3001\u30b3\u30fc\u30c9\u304c\u4f8b\u5916\u3092\u6295\u3052\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u3092\u793a\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-js\">try {\n    \/\/ error-prone code here\n}<\/code><\/pre>\n<p>\u6ce8\u610f\u3059\u3079\u304d\u70b9\u3068\u3057\u3066\u3001\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u3001\u5fc5\u305a<code>try<\/code>\u30d6\u30ed\u30c3\u30af\u306e\u5f8c\u306b<code>catch<\/code>\u30d6\u30ed\u30c3\u30af\u3092\u8a18\u8ff0\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4>catch<\/h4>\n<p><code>catch<\/code> \u306f\u3001\u30d6\u30ed\u30c3\u30af\u3092\u30ad\u30e3\u30c3\u30c1\u3059\u308b\u306e\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002\u3064\u307e\u308a\u3001<code>try<\/code>\u30d6\u30ed\u30c3\u30af\u306b\u3088\u308a\u6355\u6349\u3055\u308c\u305f\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u305d\u306e\u69cb\u6587\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-js\">catch (exception) {\n    \/\/ code to handle the exception here\n}<\/code><\/pre>\n<p>\u305d\u3057\u3066\u3001<code>try<\/code>\u3068<code>catch<\/code>\u3092\u3042\u308f\u305b\u3066\u4f7f\u7528\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">try {\n    \/\/ business logic code\n} catch (exception) {\n    \/\/ error handling code\n}<\/code><\/pre>\n<p>C++\u3084Java\u3068\u306f\u7570\u306a\u308a\u3001JavaScript\u3067\u306f1\u3064\u306e<code>try<\/code>\u30d6\u30ed\u30c3\u30af\u306b\u8907\u6570\u306e<code>catch<\/code>\u30d6\u30ed\u30c3\u30af\u3092\u4ed8\u52a0\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u3064\u307e\u308a\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<pre><code class=\"language-js\">try {\n    \/\/ business logic code\n} catch (exception) {\n    if (exception instanceof TypeError) {\n        \/\/ do something\n    }\n} catch (exception) {\n    if (exception instanceof RangeError) {\n    \/\/ do something\n    }\n}<\/code><\/pre>\n<p>\u4ee3\u308f\u308a\u306b\u30011\u3064\u306ecatch\u30d6\u30ed\u30c3\u30af\u306e\u4e2d\u3067<code>if...else<\/code>\u6587\u3084switch-case\u6587\u3092\u4f7f\u3063\u3066\u3001\u8d77\u3053\u308a\u3046\u308b\u3059\u3079\u3066\u306e\u30a8\u30e9\u30fc\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u51e6\u7406\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">try {\n    \/\/ business logic code\n} catch (exception) {\n    if (exception instanceof TypeError) {\n        \/\/ do something\n    } else if (exception instanceof RangeError) {\n        \/\/ do something else\n    }\n}<\/code><\/pre>\n<h4>finally<\/h4>\n<p><code>finally<\/code>\u306f\u3001\u30a8\u30e9\u30fc\u51e6\u7406\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u308b\u30b3\u30fc\u30c9\u30d6\u30ed\u30c3\u30af\u306e\u5b9a\u7fa9\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002\u3064\u307e\u308a\u3001try\u3068catch\u306e\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001finally\u30d6\u30ed\u30c3\u30af\u306f\u4ed6\u306e2\u3064\u306e\u30d6\u30ed\u30c3\u30af\u306e\u7d50\u679c\u306b\u95a2\u4fc2\u306a\u304f\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u3064\u307e\u308a\u3001catch\u30d6\u30ed\u30c3\u30af\u304c\u30a8\u30e9\u30fc\u3092\u5b8c\u5168\u306b\u51e6\u7406\u3067\u304d\u306a\u3044\u5834\u5408\u3084\u3001catch \u30d6\u30ed\u30c3\u30af\u3067\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u3067\u3082\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u30af\u30e9\u30c3\u30b7\u30e5\u3059\u308b\u524d\u306b\u30a4\u30f3\u30bf\u30d7\u30ea\u30bf\u306b\u3088\u308afinally\u30d6\u30ed\u30c3\u30af\u306e\u30b3\u30fc\u30c9\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>JavaScript\u306etry\u30d6\u30ed\u30c3\u30af\u306f\u3001\u305d\u306e\u5f8c\u306bcatch\u304bfinally\u3069\u3061\u3089\u304b\u304c\u7d9a\u304b\u306a\u3044\u3068\u6709\u52b9\u3068\u306f\u8a00\u3048\u307e\u305b\u3093\u3002\u3069\u3061\u3089\u3082\u5b58\u5728\u3057\u306a\u3044\u3068\u3001\u30a4\u30f3\u30bf\u30d7\u30ea\u30bf\u306b\u3088\u308aSyntaxError\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30a8\u30e9\u30fc\u51e6\u7406\u3092\u884c\u3046\u969b\u306b\u306f\u3001try\u30d6\u30ed\u30c3\u30af\u306e\u5f8c\u306b\u5c11\u306a\u304f\u3068\u3082\u3069\u3061\u3089\u304b\u306e\u30d6\u30ed\u30c3\u30af\u3092\u8a18\u8ff0\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>onerror() \u30e1\u30bd\u30c3\u30c9\u3067\u30b0\u30ed\u30fc\u30d0\u30eb\u306b\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b<\/h3>\n<p><code>onerror()<\/code>\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u3059\u3079\u3066\u306eHTML\u8981\u7d20\u3067\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u306e\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001<code>img<\/code>\u30bf\u30b0\u304c\u6307\u5b9a\u3055\u308c\u305fURL\u306e\u753b\u50cf\u3092\u898b\u3064\u3051\u3089\u308c\u306a\u304b\u3063\u305f\u5834\u5408\u3001onerror\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u3088\u308b\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u901a\u5e38\u3001<code>img<\/code>\u30bf\u30b0\u304c\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3067\u304d\u308b\u3088\u3046\u306b\u3001onerror\u3067\u5225\u306e\u753b\u50cfURL\u3092\u7528\u610f\u3057\u307e\u3059\u3002JavaScript\u3067\u3053\u308c\u3092\u884c\u3046\u65b9\u6cd5\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-js\">const image = document.querySelector(\"img\")\n\nimage.onerror = (event) =&gt; {\n    console.log(\"Error occurred: \" + event)\n}<\/code><\/pre>\n<p>\u3053\u306e\u6a5f\u80fd\u3092\u5229\u7528\u3057\u3066\u3001\u30a2\u30d7\u30ea\u306e\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u4ed5\u7d44\u307f\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u304c\u3001\u305d\u306e\u5177\u4f53\u7684\u306a\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-js\">window.onerror = (event) =&gt; {\n    console.log(\"Error occurred: \" + event)\n}<\/code><\/pre>\n<p>\u3053\u306e\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30b3\u30fc\u30c9\u5185\u306b\u3042\u308b\u8907\u6570\u306e<code>try...catch<\/code>\u30d6\u30ed\u30c3\u30af\u3092\u53d6\u308a\u9664\u304d\u3001\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u3068\u540c\u69d8\u306b\u30a2\u30d7\u30ea\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u3092\u4e00\u5143\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u300cSOLID\u300d\uff08\u8a2d\u8a08\u6307\u91dd\uff09\u306e\u300c\u5358\u4e00\u8cac\u4efb\u306e\u539f\u5247\u300d\u3092\u5b88\u308b\u305f\u3081\u306b\u3001\u8907\u6570\u306e\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30e9\u3092window\u306b\u7d10\u4ed8\u3051\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u8a72\u5f53\u3059\u308b\u30cf\u30f3\u30c9\u30e9\u306b\u5230\u9054\u3059\u308b\u307e\u3067\u3001\u30a4\u30f3\u30bf\u30d7\u30ea\u30bf\u304c\u30cf\u30f3\u30c9\u30e9\u3092\u9806\u306b\u8fbf\u3063\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3067\u30a8\u30e9\u30fc\u3092\u6e21\u3059<\/h3>\n<p>\u76f4\u7dda\u7684\u306a\u95a2\u6570\u3067\u306f\u3001\u30b7\u30f3\u30d7\u30eb\u306b\u30a8\u30e9\u30fc\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u304c\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u305d\u306e\u624b\u9806\u3092\u8907\u96d1\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre><code class=\"language-js\">const calculateCube = (number, callback) =&gt; {\n    setTimeout(() =&gt; {\n        const cube = number * number * number\n        callback(cube)\n    }, 1000)\n}\n\nconst callback = result =&gt; console.log(result)\n\ncalculateCube(4, callback)<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u95a2\u6570\u3067\u306f\u3001\u51e6\u7406\u306b\u6642\u9593\u3092\u53d6\u308a\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u5f8c\u304b\u3089\u7d50\u679c\u3092\u8fd4\u3059\u3068\u3044\u3046\u975e\u540c\u671f\u306e\u4ed5\u7d44\u307f\u304c\u4f5c\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u95a2\u6570\u547c\u3073\u51fa\u3057\u306e\u969b\u306b4\u3067\u306f\u306a\u304f\u6587\u5b57\u5217\u3092\u5165\u529b\u3059\u308b\u3068\u3001\u7d50\u679c\u3068\u3057\u3066<code>NaN<\/code>\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306b\u5bfe\u51e6\u3059\u308b\u65b9\u6cd5\u304c\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-js\">const calculateCube = (number, callback) =&gt; {\n\n    setTimeout(() =&gt; {\n        if (typeof number !== \"number\")\n            throw new Error(\"Numeric argument is expected\")\n\n        const cube = number * number * number\n        callback(cube)\n    }, 1000)\n}\n\nconst callback = result =&gt; console.log(result)\n\ntry {\n    calculateCube(4, callback)\n} catch (e) { console.log(e) }<\/code><\/pre>\n<p>\u3053\u308c\u3067\u7406\u60f3\u7684\u306b\u306f\u554f\u984c\u304c\u89e3\u6c7a\u3059\u308b\u306f\u305a\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u95a2\u6570\u547c\u3073\u51fa\u3057\u306b\u6587\u5b57\u5217\u3092\u6e21\u305d\u3046\u3068\u3059\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110236\" aria-describedby=\"caption-attachment-110236\" style=\"width: 1100px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110236 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/uncaught-error-numeric-argument.png\" alt=\"\u5f15\u6570\u3092\u9593\u9055\u3048\u305f\u30a8\u30e9\u30fc\u306e\u4f8b\" width=\"1100\" height=\"84\"><figcaption id=\"caption-attachment-110236\" class=\"wp-caption-text\">\u5f15\u6570\u3092\u9593\u9055\u3048\u305f\u30a8\u30e9\u30fc\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u95a2\u6570\u547c\u3073\u51fa\u3057\u3001try-catch\u30d6\u30ed\u30c3\u30af\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u30a8\u30e9\u30fc\u304c\u300cuncaught\u300d\u3067\u3042\u308b\u3068\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u306b\u3088\u308b\u9045\u5ef6\u306e\u305f\u3081\u3001catch\u30d6\u30ed\u30c3\u30af\u304c\u5b9f\u884c\u3055\u308c\u305f\u5f8c\u306b\u30a8\u30e9\u30fc\u304c\u6295\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u901a\u8a71\u3067\uff08\u4e88\u671f\u305b\u306c\u9045\u5ef6\u304c\u4ecb\u5728\u3057\u5f97\u308b\u305f\u3081\uff09\u767a\u751f\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u3001\u3053\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3092\u7db2\u7f85\u3057\u306a\u304c\u3089\u3001\u30a2\u30d7\u30ea\u3092\u958b\u767a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3067\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u65b9\u6cd5\u306f\u3001\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-js\">const calculateCube = (number, callback) =&gt; {\n\n    setTimeout(() =&gt; {\n        if (typeof number !== \"number\") {\n            callback(new TypeError(\"Numeric argument is expected\"))\n            return\n        }\n        const cube = number * number * number\n        callback(null, cube)\n    }, 2000)\n}\n\nconst callback = (error, result) =&gt; {\n    if (error !== null) {\n        console.log(error)\n        return\n    }\n    console.log(result)\n}\n\ntry {\n    calculateCube('hey', callback)\n} catch (e) {\n    console.log(e)\n}<\/code><\/pre>\n<p>\u3053\u308c\u3067\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u306e\u51fa\u529b\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110238\" aria-describedby=\"caption-attachment-110238\" style=\"width: 1100px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110238 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/type-error-numeric-dark.png\" alt=\"\u8aa4\u3063\u305f\u5f15\u6570\u3092\u542b\u3080TypeError\u306e\u4f8b\" width=\"1100\" height=\"84\"><figcaption id=\"caption-attachment-110238\" class=\"wp-caption-text\">\u8aa4\u3063\u305f\u5f15\u6570\u3092\u542b\u3080TypeError\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u3053\u308c\u306f\u3001\u30a8\u30e9\u30fc\u304c\u9069\u5207\u306b\u51e6\u7406\u3055\u308c\u305f\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<h3>promise\u4e2d\u306e\u30a8\u30e9\u30fc\u306e\u51e6\u7406<\/h3>\n<p>\u975e\u540c\u671f\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u306e\u51e6\u7406\u306b\u306fpromise\u304c\u597d\u307e\u308c\u308b\u50be\u5411\u306b\u3042\u308a\u307e\u3059\u3002promise\u306b\u306f\u3001\u305d\u308c\u304creject\u3055\u308c\u3066\u3082\u30b9\u30af\u30ea\u30d7\u30c8\u304c\u7d42\u4e86\u3059\u308b\u3053\u3068\u306f\u306a\u3044\u3001\u3068\u3044\u3046\u5f37\u307f\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001promise\u306e\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u3001catch\u30d6\u30ed\u30c3\u30af\u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u7406\u89e3\u3092\u6df1\u3081\u308b\u305f\u3081\u306b\u3001promise\u3092\u4f7f\u7528\u3057\u3066<code>calculateCube()<\/code>\u95a2\u6570\u3092\u66f8\u304d\u63db\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre><code class=\"language-js\">const delay = ms =&gt; new Promise(res =&gt; setTimeout(res, ms));\n\nconst calculateCube = async (number) =&gt; {\n    if (typeof number !== \"number\")\n        throw Error(\"Numeric argument is expected\")\n    await delay(5000)\n    const cube = number * number * number\n    return cube\n}\n\ntry {\n    calculateCube(4).then(r =&gt; console.log(r))\n} catch (e) { console.log(e) }<\/code><\/pre>\n<p>\u524d\u306e\u30b3\u30fc\u30c9\u306b\u3042\u3063\u305ftimeout\u306f\u3001\u7406\u89e3\u3057\u3084\u3059\u3044\u3088\u3046\u306b<code>delay<\/code>\u95a2\u6570\u306b\u5206\u96e2\u3057\u307e\u3057\u305f\u30024\u306e\u4ee3\u308f\u308a\u306b\u6587\u5b57\u5217\u3092\u5165\u529b\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u51fa\u529b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110235\" aria-describedby=\"caption-attachment-110235\" style=\"width: 1100px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110235 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/uncaught-error-numeric.png\" alt=\"promise\u306e\u5f15\u6570\u306b\u8aa4\u308a\u304c\u3042\u308b\u5834\u5408\u306eTypeError\u306e\u4f8b\" width=\"1100\" height=\"100\"><figcaption id=\"caption-attachment-110235\" class=\"wp-caption-text\">promise\u306e\u5f15\u6570\u306b\u8aa4\u308a\u304c\u3042\u308b\u5834\u5408\u306eTypeError\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u3053\u3053\u3067\u3082\u3001\u4ed6\u306e\u3059\u3079\u3066\u306e\u51e6\u7406\u304c\u5b8c\u4e86\u3057\u305f\u5f8c\u306bpromise\u304c\u30a8\u30e9\u30fc\u3092\u6295\u3052\u308b\u3053\u3068\u304c\u539f\u56e0\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u554f\u984c\u306e\u89e3\u6c7a\u65b9\u6cd5\u306f\u7c21\u5358\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b<code>promise<\/code>\u30c1\u30a7\u30fc\u30f3\u306b<code>catch()<\/code>\u547c\u3073\u51fa\u3057\u3092\u8ffd\u52a0\u3059\u308b\u3060\u3051\u3067OK\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-js\">calculateCube(\"hey\")\n.then(r =&gt; console.log(r))\n.catch(e =&gt; console.log(e))<\/code><\/pre>\n<p>\u3053\u308c\u3067\u3001\u51fa\u529b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_110242\" aria-describedby=\"caption-attachment-110242\" style=\"width: 1100px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-110242 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2021\/11\/numeric-argument-error.png\" alt=\"\u8aa4\u3063\u305f\u5f15\u6570\u3092\u5229\u7528\u3057\u305f\u3053\u3068\u306b\u3088\u308bTypeError\u306e\u5bfe\u51e6\u4f8b\" width=\"1100\" height=\"100\"><figcaption id=\"caption-attachment-110242\" class=\"wp-caption-text\">\u8aa4\u3063\u305f\u5f15\u6570\u3092\u5229\u7528\u3057\u305f\u3053\u3068\u306b\u3088\u308bTypeError\u306e\u5bfe\u51e6\u4f8b<\/figcaption><\/figure>\n<p>promise\u3092\u7528\u3044\u305f\u30a8\u30e9\u30fc\u51e6\u7406\u304c\u3044\u304b\u306b\u7c21\u5358\u3067\u3042\u308b\u304b\u3092\u3054\u7406\u89e3\u3044\u305f\u3060\u3051\u305f\u306f\u305a\u3067\u3059\u3002\u3055\u3089\u306b\u3001<code>finally()<\/code>\u30d6\u30ed\u30c3\u30af\u3068promise\u547c\u3073\u51fa\u3057\u3092\u9023\u9396\u3055\u305b\u3001\u30a8\u30e9\u30fc\u51e6\u7406\u5b8c\u4e86\u5f8c\u306b\u5b9f\u884c\u3059\u308b\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u5f93\u6765\u578b\u306etry-catch-finally\u3092\u7528\u3044\u3066\u3001promise\u306e\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u306epromise\u547c\u3073\u51fa\u3057\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">try {\n    let result = await calculateCube(\"hey\")\n    console.log(result)\n} catch (e) {\n    console.log(e)\n} finally {\n    console.log('Finally executed\")\n}<\/code><\/pre>\n<p>\u3057\u304b\u3057\u3001\u3053\u308c\u306f\u975e\u540c\u671f\u95a2\u6570\u306e\u4e2d\u3067\u306e\u307f\u6a5f\u80fd\u3057\u307e\u3059\u3002\u3068\u3044\u3046\u308f\u3051\u3067\u3001promise\u306e\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u6700\u9069\u89e3\u306f\u3001promise\u547c\u3073\u51fa\u3057\u306b\u3001<code>catch<\/code>\u3068<code>finally<\/code>\u3092\u9023\u9396\u3055\u305b\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<h3>\u300cthrow\/catch\u300d\u3001\u300conerror()\u300d\u3001\u300ccallback\uff08\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\uff09\u300d\u3001\u300cpromise\u300d\u2500\u3069\u308c\u3092\u4f7f\u3046\u3079\u304d\u304b<\/h3>\n<p>\u3053\u3053\u307e\u3067\u3067\u89e6\u308c\u3066\u304d\u305f\u3068\u304a\u308a\u30014\u3064\u306e\u65b9\u5f0f\u304c\u3042\u308a\u307e\u3059\u3002\u72b6\u6cc1\u3054\u3068\u306b\u4f7f\u3048\u308b\u9078\u629e\u80a2\u306f\u7570\u306a\u308a\u307e\u3059\u3002\u7d9a\u3044\u3066\u306f\u3001\u9078\u5225\u65b9\u6cd5\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4>throw\/catch<\/h4>\n<p>\u307b\u3068\u3093\u3069\u306e\u72b6\u6cc1\u3067\u3001\u3053\u308c\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002catch\u30d6\u30ed\u30c3\u30af\u306e\u4e2d\u3067\u3001\u8d77\u3053\u308a\u3046\u308b\u3059\u3079\u3066\u306e\u30a8\u30e9\u30fc\u306b\u5bfe\u3059\u308b\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u305f\u3001try\u30d6\u30ed\u30c3\u30af\u306e\u5f8c\u306b\u30e1\u30e2\u30ea\u306e\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u3001finally\u30d6\u30ed\u30c3\u30af\u306e\u8a18\u8ff0\u3092\u304a\u5fd8\u308c\u306a\u304f\u3002<\/p>\n<p>\u3068\u306f\u8a00\u3048\u3001try\/catch\u30d6\u30ed\u30c3\u30af\u304c\u591a\u3059\u304e\u308b\u3068\u3001\u30b3\u30fc\u30c9\u306e\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u3088\u3046\u306a\u5834\u5408\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u30cf\u30f3\u30c9\u30e9\u3084promise\u30e1\u30bd\u30c3\u30c9\u3067\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n<p>\u975e\u540c\u671ftry\/catch\u30d6\u30ed\u30c3\u30af\u3068promise\u306e<code>catch()<\/code>\u306e\u3069\u3061\u3089\u3092\u9078\u629e\u3059\u308b\u306b\u3064\u3044\u3066\u3067\u3059\u304c\u3001\u975e\u540c\u671ftry\/catch\u30d6\u30ed\u30c3\u30af\u306e\u65b9\u304c\u3001\u30b3\u30fc\u30c9\u304c\u76f4\u7dda\u7684\u306b\u306a\u308a\u3001\u30c7\u30d0\u30c3\u30b0\u3057\u3084\u3059\u3044\u306e\u3067\u3001\u305d\u3061\u3089\u3092\u63a8\u5968\u3057\u307e\u3059\u3002<\/p>\n<h4>onerror()<\/h4>\n<p><code>onerror()<\/code> \u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u591a\u304f\u306e\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001 \u3057\u304b\u3082\u554f\u984c\u306e\u7b87\u6240\u304c\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u5168\u4f53\u306b\u6563\u3089\u3070\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u306b\u6709\u7528\u3067\u3059\u3002<code>Onerror()<\/code>\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30a8\u30e9\u30fc\u3092\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5185\u306e\u30a4\u30d9\u30f3\u30c8\u306e\u3088\u3046\u306b\u6271\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u8907\u6570\u306e\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30e9\u3092\u5b9a\u7fa9\u3057\u3066\u3001\u6700\u521d\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u6642\u306b\u30a2\u30d7\u30ea\u306ewindow\u306b\u7d10\u4ed8\u3051\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u30a8\u30e9\u30fc\u306e\u7bc4\u56f2\u304c\u72ed\u3044\u5c0f\u898f\u6a21\u306a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001<code>onerror()<\/code>\u30e1\u30bd\u30c3\u30c9\u306e\u8a2d\u5b9a\u304c\u4e0d\u5fc5\u8981\u306b\u96e3\u3057\u304f\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u306e\u3067\u3054\u6ce8\u610f\u304f\u3060\u3055\u3044\u3002\u5bfe\u8c61\u306e\u30a2\u30d7\u30ea\u306b\u3042\u307e\u308a\u591a\u304f\u306e\u30a8\u30e9\u30fc\u304c\u306a\u3044\u3053\u3068\u3092\u78ba\u4fe1\u3057\u3066\u3044\u308b\u306a\u3089\u3001\u3088\u308a\u57fa\u672c\u7684\u306athrow\/catch\u3092\u4f7f\u3046\u65b9\u304c\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<h4>callback\uff08\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\uff09\u3068promise<\/h4>\n<p>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3068promise\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u306f\u3001\u305d\u306e\u8a2d\u8a08\u3084\u69cb\u9020\u304b\u3089\u7570\u306a\u308a\u307e\u3059\u3002\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u524d\u306b\u3053\u306e2\u3064\u306e\u3069\u3061\u3089\u304b\u3092\u9078\u3076\u306e\u3067\u3042\u308c\u3070\u3001promise\u3092\u9078\u3076\u306e\u304c\u8ce2\u660e\u3067\u3059\u3002<\/p>\n<p>\u3068\u3044\u3046\u306e\u3082\u3001promise\u306b\u306f<code>catch()<\/code>\u3068<code>finally()<\/code>\u30d6\u30ed\u30c3\u30af\u3092\u9023\u9396\u3055\u305b\u3066\u30a8\u30e9\u30fc\u3092\u7c21\u5358\u306b\u51e6\u7406\u3059\u308b\u4ed5\u7d44\u307f\u304c\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u65b9\u6cd5\u306f\u3001\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u5f15\u6570\u3092\u5b9a\u7fa9\u3057\u305f\u308a\u3001\u65e2\u5b58\u306e\u5f15\u6570\u3092\u518d\u5229\u7528\u3057\u305f\u308a\u3059\u308b\u3088\u308a\u3082\u7c21\u5358\u3067\u30af\u30ea\u30fc\u30f3\u3067\u3059\u3002<\/p>\n<h3>Git\u30ea\u30dd\u30b8\u30c8\u30ea\u3067\u5909\u66f4\u70b9\u3092\u8ffd\u8de1\u3059\u308b<\/h3>\n<p>\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u5185\u306e\u30df\u30b9\u3067\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u306f\u3001\u3042\u308b\u610f\u5473\u3067\u4e0d\u53ef\u907f\u3067\u3059\u3002\u958b\u767a\u4e2d\u3084\u30c7\u30d0\u30c3\u30b0\u4e2d\u306b\u3001\u4e0d\u5fc5\u8981\u306a\u5909\u66f4\u3092\u52a0\u3048\u3066\u3057\u307e\u3044\u3001\u305d\u308c\u304c\u539f\u56e0\u3067\u65b0\u305f\u306a\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u3059\u3089\u3042\u308a\u307e\u3059\u3002\u5909\u66f4\u3092\u52a0\u3048\u308b\u305f\u3073\u306b<a href=\"https:\/\/kinsta.com\/jp\/docs\/wordpress-hosting\/wordpress-reference\/technical-faq\/\">\u81ea\u52d5\u3067\u306e\u30c6\u30b9\u30c8\u3092\u5b9f\u884c<\/a>\u3057\u3066\u304a\u304f\u306e\u304c\u5f97\u7b56\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u3053\u308c\u306b\u3088\u308a\u5206\u304b\u308b\u306e\u306f\u3001\u554f\u984c\u304c\u3042\u308b\u304b\u306a\u3044\u304b\u3068\u3044\u3046\u7d50\u679c\u3060\u3051\u3067\u3059\u3002\u30b3\u30fc\u30c9\u306e\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u983b\u7e41\u306b\u53d6\u3089\u306a\u3044\u3068\u3001\u4ee5\u524d\u306f\u554f\u984c\u306a\u304f\u6a5f\u80fd\u3057\u3066\u3044\u305f\u306f\u305a\u306e\u95a2\u6570\u3084\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u4fee\u6b63\u3059\u308b\u3053\u3068\u306b\u3001\u591a\u304f\u306e\u6642\u9593\u3092\u53d6\u3089\u308c\u308b\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001Git\u3067\u3059\u3002\u3061\u3083\u3093\u3068\u30b3\u30df\u30c3\u30c8\u6226\u7565\u3092\u7acb\u3066\u308b\u3053\u3068\u3067\u3001Git\u306e\u5c65\u6b74\u3092\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u30b7\u30b9\u30c6\u30e0\u3068\u3057\u3066\u4f7f\u7528\u3057\u3001\u958b\u767a\u4e2d\u306e\u30b3\u30fc\u30c9\u306e\u5909\u9077\u3092\u8ffd\u8de1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u524d\u306e\u30b3\u30df\u30c3\u30c8\u306e\u78ba\u8a8d\u3082\u7c21\u5358\u3067\u3059\u3002\u7121\u99c4\u306b\u624b\u3092\u52a0\u3048\u3066\u3057\u307e\u3063\u305f\u7b87\u6240\u3084\u7279\u5b9a\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u697d\u3005\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u524d\u306e\u30b3\u30fc\u30c9\u3092\u5fa9\u5143\u3057\u305f\u308a\u30012\u3064\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u6bd4\u8f03\u3057\u305f\u308a\u3057\u3066\u3001\u4f55\u304c\u60aa\u304b\u3063\u305f\u306e\u304b\u3092\u5224\u65ad\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-github\/\">GitHub<\/a> Desktop\u3084GitKraken\u306e\u3088\u3046\u306a\u6700\u65b0\u306e<a href=\"https:\/\/kinsta.com\/jp\/blog\/web-development-tools\/\">\u30a6\u30a7\u30d6\u958b\u767a\u30c4\u30fc\u30eb<\/a>\u3092\u4f7f\u3048\u3070\u3001\u5909\u66f4\u70b9\u3092\u4e26\u3079\u3066\u8996\u899a\u5316\u3057\u3001\u9593\u9055\u3044\u3092\u7d20\u65e9\u304f\u7a81\u304d\u6b62\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30df\u30b9\u3092\u6e1b\u3089\u3059\u305f\u3081\u306e\u7fd2\u6163\u3068\u3057\u3066\u3001\u30b3\u30fc\u30c9\u306b\u5927\u304d\u306a\u5909\u66f4\u3092\u52a0\u3048\u308b\u305f\u3073\u306b<a href=\"https:\/\/kinsta.com\/jp\/blog\/code-review-tools\/\">\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc<\/a>\u3092\u5b9f\u65bd\u3059\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002\u30c1\u30fc\u30e0\u3067\u4f5c\u696d\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u30d7\u30eb\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u4f5c\u6210\u3057\u3001\u30c1\u30fc\u30e0\u30e1\u30f3\u30d0\u30fc\u306b\u5fb9\u5e95\u7684\u306b\u30ec\u30d3\u30e5\u30fc\u3057\u3066\u3082\u3089\u3046\u306e\u304c\u9244\u5247\u3067\u3059\u3002\u3042\u306a\u305f\u304c\u3046\u3063\u304b\u308a\u898b\u843d\u3068\u3057\u3066\u3044\u308b\u30a8\u30e9\u30fc\u304c\u898b\u3064\u304b\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<h2>JavaScript\u306e\u30a8\u30e9\u30fc\u306b\u95a2\u3059\u308b\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n<p>\u3053\u3053\u307e\u3067\u306f\u3001JavaScript\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u3042\u308a\u304c\u3061\u306a\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u3092\u500b\u5225\u306b\u3054\u7d39\u4ecb\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u5bfe\u51e6\u6cd5\u306e\u628a\u63e1\u306b\u306f\u5341\u5206\u3067\u3057\u3087\u3046\u3002\u3068\u306f\u8a00\u3048\u3001\u30a8\u30e9\u30fc\u89e3\u6c7a\u306e\u52b9\u679c\u3092\u6700\u5927\u5316\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u5b9f\u88c5\u306e\u969b\u306b\u3044\u304f\u3064\u304b\u306e\u70b9\u306b\u7559\u610f\u3057\u305f\u3044\u3068\u3053\u308d\u3067\u3059\u3002\u5177\u4f53\u7684\u306a\u30d2\u30f3\u30c8\u3092\u4ee5\u4e0b\u306b\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n<h3>1. \u64cd\u4f5c\u4e0a\u306e\u4f8b\u5916\u51e6\u7406\u306b\u72ec\u81ea\u306e\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n<p>\u8a18\u4e8b\u306e\u524d\u534a\u3067\u72ec\u81ea\u306e\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u306e\u4f5c\u6210\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u56fa\u6709\u306e\u72b6\u6cc1\u306b\u5408\u308f\u305b\u3066\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u3057\u304b\u305f\u3092\u8abf\u6574\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u305f\u3081\u3067\u3059\u3002\u4e00\u822c\u7684\u306a <code>Error<\/code> \u30af\u30e9\u30b9\u3067\u306f\u306a\u304f\u3001\u53ef\u80fd\u306a\u9650\u308a\u72ec\u81ea\u306e\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002\u305d\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u901a\u5e38\u3088\u308a\u3082\u591a\u304f\u306e\u60c5\u5831\u3084\u80cc\u666f\u304c\u78ba\u8a8d\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u72ec\u81ea\u306e\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u3067\u306f\u3001\u547c\u3073\u51fa\u3057\u5074\u306e\u74b0\u5883\u306b\u304a\u3051\u308b\u30a8\u30e9\u30fc\u306e\u8868\u793a\u65b9\u6cd5\u3092\u8abf\u6574\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u7279\u5b9a\u306e\u9805\u76ee\u3092\u96a0\u3057\u305f\u308a\u3001\u30a8\u30e9\u30fc\u306b\u95a2\u3059\u308b\u3082\u3063\u3068\u8a73\u3057\u3044\u60c5\u5831\u3092\u8868\u793a\u3057\u305f\u308a\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30a8\u30e9\u30fc\u306e\u5185\u5bb9\u3092\u597d\u304d\u306a\u3088\u3046\u306b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\u30a8\u30e9\u30fc\u306e\u89e3\u91c8\u3084\u51e6\u7406\u306e\u3057\u304b\u305f\u3092\u7d30\u304b\u304f\u5236\u5fa1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>2. \u4f8b\u5916\u3092\u653e\u7f6e\u3057\u306a\u3044<\/h3>\n<p>\u4e0a\u7d1a\u958b\u767a\u8005\u3067\u3042\u3063\u3066\u3082\u3001\u30b3\u30fc\u30c9\u306e\u5965\u6df1\u304f\u3067\u4f8b\u5916\u3092\u307b\u3063\u305f\u3089\u304b\u3057\u306b\u3057\u3066\u3057\u307e\u3046\u3001\u3068\u3044\u3046\u521d\u6b69\u7684\u306a\u30df\u30b9\u3092\u72af\u3059\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u3053\u3093\u306a\u72b6\u6cc1\u3067\u3059\u3002\u5b9f\u884c\u304c\u4efb\u610f\u3067\u3042\u308b\u30b3\u30fc\u30c9\u304c\u3042\u3063\u305f\u3068\u3057\u307e\u3059\u3002\u3082\u3057\u305d\u308c\u304c\u6a5f\u80fd\u3059\u308c\u3070\u3001\u7d20\u6674\u3089\u3057\u3044\u3053\u3068\u3067\u3059\u3002\u4e00\u65b9\u3067\u3082\u3057\u6a5f\u80fd\u3057\u306a\u304f\u3066\u3082\u3001\u5927\u3057\u305f\u554f\u984c\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u3001\u3053\u306e\u30b3\u30fc\u30c9\u3092try\u30d6\u30ed\u30c3\u30af\u306b\u5165\u308c\u3001\u7a7a\u306ecatch\u30d6\u30ed\u30c3\u30af\u3067\u305d\u306e\u5834\u3057\u306e\u304e\u3092\u3057\u305f\u304f\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u305d\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u305d\u306e\u30b3\u30fc\u30c9\u304c\u3042\u3089\u3086\u308b\u7a2e\u985e\u306e\u30a8\u30e9\u30fc\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u304c\u5927\u304d\u304f\u306a\u3063\u305f\u6642\u3001\u305d\u3057\u3066\u3001\u3053\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u7ba1\u7406\u306e\u4e0d\u5099\u304c\u591a\u3044\u5834\u5408\u3001\u5927\u304d\u306a\u30ea\u30b9\u30af\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u5916\u3092\u51e6\u7406\u3059\u308b\u4e0a\u3067\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306f\u3053\u3046\u3067\u3059\u3002\u3059\u3079\u3066\u306e\u4f8b\u5916\u3092\u51e6\u7406\u3059\u308b\u30ec\u30d9\u30eb\u3092\u6c7a\u5b9a\u3057\u3001\u305d\u3053\u306b\u81f3\u308b\u307e\u3067\u306b\u3001\u4f8b\u5916\u51e6\u7406\u306b\u3068\u3070\u3059\u3053\u3068\u3002\u3053\u306e\u30ec\u30d9\u30eb\u306f\u3001\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\uff08MVC\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u30a2\u30d7\u30ea\u306e\u5834\u5408\uff09\u3067\u3082\u30df\u30c9\u30eb\u30a6\u30a7\u30a2\uff08\u5f93\u6765\u306e\u30b5\u30fc\u30d0\u30fc\u6307\u5411\u306e\u30a2\u30d7\u30ea\u306e\u5834\u5408\uff09\u3067\u3082\u304b\u307e\u3044\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u30a2\u30d7\u30ea\u3067\u767a\u751f\u3057\u3066\u3044\u308b\u3059\u3079\u3066\u306e\u30a8\u30e9\u30fc\u306e\u5834\u6240\u3092\u628a\u63e1\u3057\u306a\u304c\u3089\u5bfe\u51e6\u6cd5\uff08\u305f\u3068\u3048\u4f55\u3082\u3057\u306a\u3044\u3053\u3068\u3092\u9078\u307c\u3046\u3068\u3082\uff09\u3092\u8ce2\u304f\u9078\u629e\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>3. \u30ed\u30b0\u3068\u30a8\u30e9\u30fc\u30a2\u30e9\u30fc\u30c8\u3092\u4e00\u5143\u5316\u3059\u308b<\/h3>\n<p>\u30a8\u30e9\u30fc\u306e\u51e6\u7406\u306b\u304a\u3051\u308b\u5927\u4e8b\u306a\u8981\u7d20\u3068\u3057\u3066\u3001\u30ed\u30b0\u3092\u53d6\u308b\u3053\u3068\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002\u30a8\u30e9\u30fc\u306e\u30ed\u30b0\u3092\u4e00\u5143\u7684\u306b\u7ba1\u7406\u3057\u306a\u3044\u3068\u3001\u30a2\u30d7\u30ea\u306e\u4f7f\u7528\u72b6\u6cc1\u306b\u95a2\u3059\u308b\u8cb4\u91cd\u306a\u60c5\u5831\u3092\u898b\u9003\u3057\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30a2\u30d7\u30ea\u306e\u30a4\u30d9\u30f3\u30c8\u30ed\u30b0\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3067\u3001\u30a8\u30e9\u30fc\u306b\u95a2\u3059\u308b\u91cd\u8981\u306a\u30c7\u30fc\u30bf\u3092\u628a\u63e1\u3057\u3001\u7d20\u65e9\u3044\u30c7\u30d0\u30c3\u30b0\u306b\u5f79\u7acb\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30a2\u30d7\u30ea\u306b\u9069\u5207\u306a\u30a2\u30e9\u30fc\u30c8\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u8a2d\u5b9a\u3057\u3066\u304a\u3044\u3066\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u3068\u304d\u306b\u3001\u305d\u308c\u304c\u591a\u304f\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u5f71\u97ff\u3092\u53ca\u307c\u3059\u524d\u306b\u628a\u63e1\u3059\u308b\u306e\u304c\u7406\u60f3\u3067\u3059\u3002<\/p>\n<p>\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30ed\u30ac\u30fc\u3092\u4f7f\u7528\u3059\u308b\u304b\u3001\u597d\u307f\u306b\u3042\u308f\u305b\u3066\u30ed\u30ac\u30fc\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002\u30ed\u30ac\u30fc\u306e\u4e2d\u306b\u306f\u3001\u30a8\u30e9\u30fc\u306e\u30ec\u30d9\u30eb (\u8b66\u544a\u3001\u30c7\u30d0\u30c3\u30b0\u3001\u60c5\u5831\u306a\u3069) \u306b\u5fdc\u3058\u3066\u51e6\u7406\u65b9\u6cd5\u3092\u8a2d\u5b9a\u3067\u304d\u3001\u4e2d\u306b\u306f\u30ed\u30b0\u3092\u3059\u3050\u306b\u30ea\u30e2\u30fc\u30c8\u30ed\u30ae\u30f3\u30b0\u306e\u30b5\u30fc\u30d0\u30fc\u306b\u9001\u4fe1\u3059\u308b\u3082\u306e\u3055\u3048\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30ed\u30b8\u30c3\u30af\u304c\u5229\u7528\u8005\u306b\u5bfe\u3057\u3066\u3069\u306e\u3088\u3046\u306b\u5b9f\u884c\u3055\u308c\u308b\u304b\u3092\u76e3\u8996\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>4. \u30e6\u30fc\u30b6\u30fc\u306b\u5bfe\u3057\u9069\u5207\u306b\u30a8\u30e9\u30fc\u3092\u901a\u77e5\u3059\u308b<\/h3>\n<p>\u30a8\u30e9\u30fc\u51e6\u7406\u65b9\u6cd5\u3092\u5b9a\u7fa9\u3059\u308b\u969b\u306b\u3001\u30e6\u30fc\u30b6\u30fc\u3092\u5ff5\u982d\u306b\u7f6e\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30a2\u30d7\u30ea\u306e\u6b63\u5e38\u306a\u6a5f\u80fd\u3092\u59a8\u3052\u308b\u3059\u3079\u3066\u306e\u554f\u984c\u306f\u3001\u76ee\u306b\u898b\u3048\u308b\u304b\u305f\u3061\u3067\uff08\u30a2\u30e9\u30fc\u30c8\u3084\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\uff09\u78ba\u8a8d\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u3088\u308b\u89e3\u6c7a\u7b56\u306e\u5b9f\u65bd\u304c\u4fc3\u305b\u307e\u3059\u3002\u64cd\u4f5c\u306e\u518d\u8a66\u884c\u3084\u30ed\u30b0\u30a2\u30a6\u30c8\u3068\u518d\u30ed\u30b0\u30a4\u30f3\u306a\u3069\u3001\u30a8\u30e9\u30fc\u306e\u7c21\u5358\u306a\u89e3\u6c7a\u65b9\u6cd5\u3092\u77e5\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u30a2\u30e9\u30fc\u30c8\u306b\u5fc5\u305a\u8a18\u8f09\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u65e5\u5e38\u7684\u306a\u4f7f\u7528\u306b\u652f\u969c\u3092\u304d\u305f\u3055\u306a\u3044\u30a8\u30e9\u30fc\u306e\u5834\u5408\u3001\u30a2\u30e9\u30fc\u30c8\u306f\u51fa\u3055\u305a\u306b\u3001\u5f8c\u3067\u89e3\u6c7a\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u30ea\u30e2\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u3067\u8a18\u9332\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<h3>5. \u30df\u30c9\u30eb\u30a6\u30a7\u30a2\u306e\u5b9f\u88c5\uff08Node.js\uff09<\/h3>\n<p><a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-node-js\/\">Node.js\u74b0\u5883<\/a>\u306f\u30b5\u30fc\u30d0\u30fc\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u6a5f\u80fd\u3092\u8ffd\u52a0\u3059\u308b\u30df\u30c9\u30eb\u30a6\u30a7\u30a2\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u6a5f\u80fd\u3092\u5229\u7528\u3057\u3066\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u7528\u30df\u30c9\u30eb\u30a6\u30a7\u30a2\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30df\u30c9\u30eb\u30a6\u30a7\u30a2\u3092\u4f7f\u7528\u3059\u308b\u6700\u3082\u5927\u304d\u306a\u5229\u70b9\u306f\u3001\u3059\u3079\u3066\u306e\u30a8\u30e9\u30fc\u3092\u4e00\u7b87\u6240\u3067\u96c6\u4e2d\u7684\u306b\u51e6\u7406\u3067\u304d\u308b\u3053\u3068\u3002\u3053\u306e\u8a2d\u5b9a\u306f\u3001\u30c6\u30b9\u30c8\u7528\u306b\u7c21\u5358\u306b\u6709\u52b9\/\u7121\u52b9\u5316\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u57fa\u672c\u7684\u306a\u30df\u30c9\u30eb\u30a6\u30a7\u30a2\u306e\u4f5c\u308a\u65b9\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">const logError = err =&gt; {\n    console.log(\"ERROR: \" + String(err))\n}\n\nconst errorLoggerMiddleware = (err, req, res, next) =&gt; {\n    logError(err)\n    next(err)\n}\n\nconst returnErrorMiddleware = (err, req, res, next) =&gt; {\n    res.status(err.statusCode || 500)\n       .send(err.message)\n}\n\nmodule.exports = {\n    logError,\n    errorLoggerMiddleware,\n    returnErrorMiddleware\n}<\/code><\/pre>\n<p>\u305d\u3057\u3066\u3001\u3053\u306e\u30df\u30c9\u30eb\u30a6\u30a7\u30a2\u3092\u30a2\u30d7\u30ea\u5185\u3067\u6b21\u306e\u3088\u3046\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">const { errorLoggerMiddleware, returnErrorMiddleware } = require('.\/errorMiddleware')\n\napp.use(errorLoggerMiddleware)\n\napp.use(returnErrorMiddleware)<\/code><\/pre>\n<p>\u3053\u308c\u3067\u3001\u30df\u30c9\u30eb\u30a6\u30a7\u30a2\u306e\u5185\u90e8\u3067\u72ec\u81ea\u306e\u30ed\u30b8\u30c3\u30af\u3092\u5b9a\u7fa9\u3057\u3001\u9069\u5207\u306b\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3067\u304d\u307e\u3059\u3002\u3082\u3046\u3001\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u5168\u4f53\u3067\u3001\u500b\u5225\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u69cb\u9020\u306e\u5b9f\u88c5\u306b\u982d\u3092\u60a9\u307e\u305b\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h3>6. \u610f\u56f3\u7684\u306b\u30a2\u30d7\u30ea\u3092\u518d\u8d77\u52d5\u3059\u308b (Node.js)<\/h3>\n<p>Node.js\u30a2\u30d7\u30ea\u304c\u30a8\u30e9\u30fc\u306b\u906d\u9047\u3057\u305f\u969b\u3001\u5fc5\u305a\u3057\u3082\u4f8b\u5916\u3092\u6295\u3052\u308b\u3068\u306f\u9650\u3089\u305a\u3001\u30a2\u30d7\u30ea\u3092\u7d42\u4e86\u3057\u3088\u3046\u3068\u3059\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u3068\u3057\u3066\u3001CPU\u306e\u5927\u91cf\u6d88\u8cbb\u3001\u30e1\u30e2\u30ea\u306e\u80a5\u5927\u5316\u3001\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306a\u3069\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u30df\u30b9\u306b\u8d77\u56e0\u3059\u308b\u554f\u984c\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002\u3053\u308c\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306b\u306f\u3001Node.js\u306e\u30af\u30e9\u30b9\u30bf\u30e2\u30fc\u30c9\u3084\u3001PM2\u306e\u3088\u3046\u306a\u30c4\u30fc\u30eb\u3092\u4f7f\u3063\u3066\u30a2\u30d7\u30ea\u3092\u30af\u30e9\u30c3\u30b7\u30e5\u3055\u305b\u3001\u518d\u8d77\u52d5\uff08\u30b0\u30ec\u30fc\u30b9\u30d5\u30eb\u30fb\u30ea\u30b9\u30bf\u30fc\u30c8\uff09\u3055\u305b\u308b\u306e\u304c\u7406\u60f3\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u64cd\u4f5c\u306b\u3088\u3063\u3066\u30a2\u30d7\u30ea\u304c\u30af\u30e9\u30c3\u30b7\u30e5\u3057\u3066\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u304c\u5bb3\u3055\u308c\u308b\u306e\u3092\u56de\u907f\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>7. \u300cuncaught\u300d\u306e\u4f8b\u5916\u3092\u5168\u3066\u300ccatch\u300d\u3059\u308b (Node.js)<\/h3>\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u5fb9\u5e95\u3057\u3088\u3046\u3068\u3082\u3001\u30a2\u30d7\u30ea\u3067\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u3059\u3079\u3066\u306e\u30a8\u30e9\u30fc\u3092\u30ab\u30d0\u30fc\u3067\u304d\u3066\u3044\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30a2\u30d7\u30ea\u3067\u767a\u751f\u3059\u308b\u300c\u6355\u6349\u304b\u3089\u6f0f\u308c\u305f\u300d\u4f8b\u5916\u3092\u3059\u3079\u3066catch\u3059\u308b\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u6226\u7565\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u809d\u8981\u3067\u3059\u3002<\/p>\n<p>\u305d\u306e\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">process.on('uncaughtException', error =&gt; {\n    console.log(\"ERROR: \" + String(error))\n    \/\/ other handling mechanisms\n})<\/code><\/pre>\n<p>\u307e\u305f\u3001\u767a\u751f\u3057\u305f\u30a8\u30e9\u30fc\u304c\u6a19\u6e96\u7684\u306a\u4f8b\u5916\u306a\u306e\u304b\u3001\u7279\u5225\u306a\u64cd\u4f5c\u30a8\u30e9\u30fc\u306a\u306e\u304b\u3092\u8b58\u5225\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u306b\u57fa\u3065\u3044\u3066\u3001\u30d7\u30ed\u30bb\u30b9\u3092\u7d42\u4e86\u3057\u3001\u518d\u8d77\u52d5\u3059\u308b\u3053\u3068\u3067\u3001\u4e88\u671f\u305b\u306c\u52d5\u4f5c\u3092\u56de\u907f\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<h3>8. \u672a\u51e6\u7406\u306e\u300creject\u300d\u3092\u3059\u3079\u3066\u300ccatch\u300d\u3059\u308b\uff08Node.js\uff09<\/h3>\n<p>\u4f8b\u5916\u3092\u3059\u3079\u3066\u30ab\u30d0\u30fc\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u306e\u3068\u540c\u69d8\u306b\u3001promise\u306ereject\u3092\u3059\u3079\u3066\u51e6\u7406\u3057\u304d\u308c\u306a\u3044\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u4f8b\u5916\u3068\u306f\u7570\u306a\u308a\u3001promise\u306ereject\u306f\u30a8\u30e9\u30fc\u3092\u6295\u3052\u307e\u305b\u3093\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u91cd\u8981\u306apromise\u304creject\u306b\u306a\u3063\u305f\u5834\u5408\u3001\u305d\u308c\u304c\u6700\u7d42\u7684\u306b\u306f\u3001\u4e88\u671f\u305b\u306c\u52d5\u4f5c\u306b\u3064\u306a\u304c\u308b\u30ea\u30b9\u30af\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001promise\u306ereject\u3092\u51e6\u7406\u3059\u308b\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u4ed5\u7d44\u307f\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002<\/p>\n<p>\u305d\u306e\u65b9\u6cd5\u304c\u3001\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-js\">const promiseRejectionCallback = error =&gt; {\n    console.log(\"PROMISE REJECTED: \" + String(error))\n}\n\nprocess.on('unhandledRejection', callback)<\/code><\/pre>\n\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u3069\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3082\u30a8\u30e9\u30fc\u3092\u5b8c\u5168\u306b\u907f\u3051\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002JavaScript\u3082\u4f8b\u5916\u3067\u306f\u306a\u304f\u3001\u30a8\u30e9\u30fc\u306f\u81ea\u7136\u306a\u3082\u306e\u3067\u3059\u3002\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u53cd\u5fdc\u3068\u3057\u3066\u3001\u610f\u56f3\u7684\u306b\u30a8\u30e9\u30fc\u3092\u6295\u3052\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u3055\u3048\u3042\u308a\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30a8\u30e9\u30fc\u306e\u69cb\u9020\u3068\u7a2e\u985e\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u505c\u6b62\u3055\u305b\u3066\u3057\u307e\u3046\u30a8\u30e9\u30fc\u3092\u7279\u5b9a\u3057\u3001\u305d\u308c\u3092\u9632\u3050\u305f\u3081\u306e\u77e5\u8b58\u3068\u9053\u5177\u3092\u7528\u610f\u3057\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u591a\u304f\u306e\u5834\u5408\u3001JavaScript\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u7a2e\u985e\u306b\u9650\u3089\u305a\u3001\u614e\u91cd\u306b\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3057\u3066\u3044\u304f\u6226\u7565\u3092\u69cb\u7bc9\u3059\u308b\u3053\u3068\u304c\u9375\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><em>\u4ed6\u306b\u307e\u3060\u89e3\u6c7a\u3067\u304d\u3066\u3044\u306a\u3044<\/em><em>JavaScript<\/em><em>\u306e\u30a8\u30e9\u30fc\u306f\u3042\u308a\u307e\u3059\u304b\uff1f<\/em><em>JS<\/em><em>\u306e\u30a8\u30e9\u30fc\u3092\u5efa\u8a2d\u7684\u306b\u51e6\u7406\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af\u304c\u3042\u308c\u3070\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u4ee5\u4e0b\u306e\u30b3\u30e1\u30f3\u30c8\u6b04\u3067\u304a\u805e\u304b\u305b\u304f\u3060\u3055\u3044\u3002<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u304b\u306e\u6709\u540d\u306a\u30de\u30fc\u30d5\u30a3\u30fc\u306e\u6cd5\u5247\u306b\u3053\u3093\u306a\u8a00\u8449\u304c\u3042\u308a\u307e\u3059\u2500\u300c &#8230;<\/p>\n","protected":false},"author":238,"featured_media":35977,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[288,482,45],"topic":[776],"class_list":["post-35976","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-development","tag-javascript","tag-webdev","topic-javascript-errors"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.6 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JavaScript\u306e\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u306e\u89e3\u6c7a\u65b9\u6cd5\uff08\u6c7a\u5b9a\u7248\uff09<\/title>\n<meta name=\"description\" content=\"JavaScript\u306e\u30a8\u30e9\u30fc\u3067\u3064\u307e\u3065\u3044\u3066\u3044\u307e\u305b\u3093\u304b\uff1f\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u958b\u767a\u3092\u8ecc\u9053\u306b\u4e57\u305b\u3089\u308c\u308b\u3088\u3046\u306b\u3001\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u306b\u5bfe\u51e6\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kinsta.com\/jp\/blog\/errors-in-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript\u306e\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u306e\u89e3\u6c7a\u65b9\u6cd5\uff08\u6c7a\u5b9a\u7248\uff09\" \/>\n<meta property=\"og:description\" content=\"JavaScript\u306e\u30a8\u30e9\u30fc\u3067\u3064\u307e\u3065\u3044\u3066\u3044\u307e\u305b\u3093\u304b\uff1f\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u958b\u767a\u3092\u8ecc\u9053\u306b\u4e57\u305b\u3089\u308c\u308b\u3088\u3046\u306b\u3001\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u306b\u5bfe\u51e6\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kinsta.com\/jp\/blog\/errors-in-javascript\/\" \/>\n<meta property=\"og:site_name\" content=\"Kinsta\u00ae\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Kinsta-Japan-334616080691171\/\" \/>\n<meta property=\"article:published_time\" content=\"2022-08-17T07:22:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-08-25T07:30:50+00:00\" \/>\n<meta property=\"og:image\" 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