{"id":49120,"date":"2023-01-23T08:41:56","date_gmt":"2023-01-23T08:41:56","guid":{"rendered":"https:\/\/kinsta.com\/se\/?p=49120&#038;preview=true&#038;preview_id=49120"},"modified":"2023-09-18T10:21:46","modified_gmt":"2023-09-18T10:21:46","slug":"lat-laddning-i-angular","status":"publish","type":"post","link":"https:\/\/kinsta.com\/se\/blog\/lat-laddning-i-angular\/","title":{"rendered":"Lat Laddning i Angular (anv\u00e4nd detta p\u00e5 din webbplats)"},"content":{"rendered":"<p><a href=\"https:\/\/kinsta.com\/blog\/angular-vs-vue\/#what-is-angular\">Angular<\/a> \u00e4r ett <a href=\"https:\/\/kinsta.com\/javascript\/\">JavaScript<\/a>-ramverk f\u00f6r frontend. Det har utvecklats av Google f\u00f6r byggande av skalbara webbapplikationer i f\u00f6retagsklass. Vissa av dessa applikationer kan bli ganska stora, vilket p\u00e5verkar laddningstiden f\u00f6r din applikation.<\/p>\n<p>F\u00f6r att minska laddningstiden och f\u00f6rb\u00e4ttra helhetsupplevelsen f\u00f6r dina anv\u00e4ndare s\u00e5 kan du anv\u00e4nda en teknik som kallas lat laddning. Med denna inbyggda Angular-funktion s\u00e5 kan du f\u00f6rst ladda endast de n\u00f6dv\u00e4ndiga delarna av webbapplikationen och sedan ladda andra moduler efter behov.<\/p>\n<p>I den h\u00e4r artikeln s\u00e5 kommer du att l\u00e4ra dig mer om lat laddning och hur den kan bidra till att snabba upp din webbapplikation.<\/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<h2>Vad \u00e4r lat laddning?<\/h2>\n<p><a href=\"https:\/\/kinsta.com\/se\/blog\/wordpress-latladdning\/#what-is-lazy-loading\">Lat laddning<\/a> \u00e4r en teknik d\u00e4r webbsidans element endast laddas n\u00e4r de beh\u00f6vs. Dess motsvarighet \u00e4r <i>ivrig laddning<\/i>\u00a0n\u00e4r allt laddas &#8211; eller f\u00f6rs\u00f6ker laddas &#8211; omedelbart. Att h\u00e4mta alla bilder, videor, CSS och JavaScript-kod ivrigt kan inneb\u00e4ra l\u00e5nga laddningstider &#8211; d\u00e5liga nyheter f\u00f6r anv\u00e4ndarna.<\/p>\n<p>Lat laddning anv\u00e4nds ofta f\u00f6r bilder och videor p\u00e5 webbplatser med mycket inneh\u00e5ll. Om man laddar alla medier p\u00e5 en g\u00e5ng s\u00e5 anv\u00e4nds mycket bandbredd och sidvisningarna f\u00f6rdr\u00f6js. I lat laddning s\u00e5 laddas dessa element n\u00e4r deras plats p\u00e5 sidan \u00e4r p\u00e5 v\u00e4g att rullas in.<\/p>\n<p>Angular \u00e4r ett ramverk f\u00f6r enstaka sidor som bygger p\u00e5 JavaScript f\u00f6r en stor del av sin funktionalitet. Din applikations samling av JavaScript kan l\u00e4tt bli stor n\u00e4r appen v\u00e4xer, och detta inneb\u00e4r en motsvarande \u00f6kning av dataanv\u00e4ndning och laddningstid. F\u00f6r att snabba upp saker och ting s\u00e5 kan du anv\u00e4nda lat laddning f\u00f6r att f\u00f6rst h\u00e4mta n\u00f6dv\u00e4ndiga moduler och skjuta upp laddningen av andra moduler tills de beh\u00f6vs.<\/p>\n<h2>F\u00f6rdelar med lat laddning i Angular<\/h2>\n<p>Lat laddning erbjuder f\u00f6rdelar som g\u00f6r din webbplats mer anv\u00e4ndarv\u00e4nlig. Dessa inkluderar:<\/p>\n<ul>\n<li><strong>Snabbare laddningstid:<\/strong> JavaScript inkluderar instruktioner f\u00f6r att visa din sida och ladda dess data. P\u00e5 grund av detta s\u00e5 \u00e4r det en <em>resurs som blockerar rendering<\/em>. Det inneb\u00e4r att webbl\u00e4saren m\u00e5ste v\u00e4nta p\u00e5 att ladda in all JavaScript innan sidan visas. Vid lat laddning i Angular s\u00e5 delas JavaScript upp i delar som laddas separat. Den f\u00f6rsta biten inneh\u00e5ller endast den logik som beh\u00f6vs f\u00f6r sidans huvudmodul. Den laddas ivrigt, och de \u00e5terst\u00e5ende modulerna via lat laddning. Genom att minska storleken p\u00e5 den inledande biten s\u00e5 <a href=\"https:\/\/kinsta.com\/learn\/page-speed\/\" target=\"_blank\" rel=\"noopener noreferrer\">laddas och renderas sidan snabbare<\/a>.<\/li>\n<li><strong>Mindre dataanv\u00e4ndning:<\/strong> Genom att dela upp data i bitar och ladda vid behov s\u00e5 kan du anv\u00e4nda mindre <a href=\"https:\/\/kinsta.com\/blog\/cpanel-bandwidth-usage\/\" target=\"_blank\" rel=\"noopener noreferrer\">bandbredd<\/a>.<\/li>\n<li><strong>Bevarade webbl\u00e4sarresurser:<\/strong> Eftersom webbl\u00e4saren endast laddar de delar som beh\u00f6vs s\u00e5 sl\u00f6sar den inte bort minne och processor p\u00e5 att tolka och \u00e5terge kod som inte beh\u00f6vs.<\/li>\n<\/ul>\n\n<h2>Implementering av lat laddning i Angular<\/h2>\n<p>F\u00f6r att f\u00f6lja med i den h\u00e4r handledningen s\u00e5 beh\u00f6ver du f\u00f6ljande:<\/p>\n<ul>\n<li><a href=\"https:\/\/nodejs.org\/en\/\" target=\"_blank\" rel=\"noopener noreferrer\">NodeJS<\/a> installerat<\/li>\n<li>Grundl\u00e4ggande kunskaper om Angular<\/li>\n<\/ul>\n<h3>Uppdatera ditt projekt<\/h3>\n<p>Du kommer att anv\u00e4nda <a href=\"https:\/\/angular.io\/cli\" target=\"_blank\" rel=\"noopener noreferrer\">Angular CLI<\/a> f\u00f6r att skapa ditt projekt. Du kan installera CLI med hj\u00e4lp av <a href=\"https:\/\/kinsta.com\/blog\/what-is-npm\/\">npm<\/a> genom att k\u00f6ra kommandot:<\/p>\n<p><code class=\"language=bash\">npm install -g @angular\/cli<\/code><\/p>\n<p>D\u00e4refter s\u00e5 skapar du ett projekt som heter Lat Laddning Demo p\u00e5 f\u00f6ljande s\u00e4tt:<\/p>\n<p><code class=\"language=bash\">ng new lazy-loading-demo --routing<\/code><\/p>\n<p>Detta kommando skapar ett nytt Angular-projekt, komplett med routing. Du kommer att arbeta uteslutande i mappen <code>src\/app<\/code>, som inneh\u00e5ller koden f\u00f6r din app. Denna mapp inkluderar din huvudsakliga routing-fil, <code>app-routing.module.ts<\/code>. Strukturen i mappen b\u00f6r se ut s\u00e5 h\u00e4r:<\/p>\n<figure style=\"width: 1034px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/12\/angular-src-folder-structure-lazy-loading.png\" alt=\"Mappstrukturen i ett Angular-projekt.\" width=\"1034\" height=\"530\"><figcaption class=\"wp-caption-text\">Mappstrukturen i ett Angular-projekt.<\/figcaption><\/figure>\n<h3>Skapa en funktionsmodul med routar<\/h3>\n<p>D\u00e4refter s\u00e5 ska du skapa en funktionsmodul som kommer att laddas l\u00e5ngsamt. F\u00f6r att skapa den h\u00e4r modulen s\u00e5 k\u00f6r du det h\u00e4r kommandot:<\/p>\n<p><code class=\"language=bash\">ng generate module blog --route blog --module app.module<\/code><\/p>\n<p>Det h\u00e4r kommandot skapar en modul som heter <code>BlogModule<\/code>, tillsammans med routing. Om du \u00f6ppnar <code>src<\/code><code>\/app\/app-routing.module.ts<\/code> s\u00e5 ser den ut s\u00e5 h\u00e4r:<\/p>\n<pre><code class=\"typescript\">import { NgModule } from '@angular\/core';\nimport { RouterModule, Routes } from '@angular\/router';\n\nconst routes: Routes = [ { path: 'blog', loadChildren: () =&gt; import('.\/blog\/blog.module').then(m =&gt; m.BlogModule) }];\n\n@NgModule({\n  imports: [RouterModule.forRoot(routes)],\n  exports: [RouterModule]\n})\nexport class AppRoutingModule { } \n<\/code><\/pre>\n<p>Den del som \u00e4r viktig f\u00f6r latheten \u00e4r den tredje raden:<\/p>\n<pre><code class=\"language=typescript\">const routes: Routes = [ { path: 'blog', loadChildren: () =&gt; import('.\/blog\/blog.module').then(m =&gt; m.BlogModule) }];\n<\/code><\/pre>\n<p>P\u00e5 den raden definieras routerna. Routen f\u00f6r bloggen anv\u00e4nder argumentet <code>loadChildren<\/code> i st\u00e4llet f\u00f6r <code>component<\/code>. Argumentet <code>loadChildren<\/code> talar om f\u00f6r Angular att lat laddning ska ladda routen. Det vill s\u00e4ga att importera modulen dynamiskt endast n\u00e4r routen bes\u00f6ks, och sedan returnera den till routen. Modulen definierar sina egna underordnade router, t.ex. <code>blog\/**<\/code>, i filen <code>routing.module.ts<\/code>. Bloggmodulen som du genererade ser ut s\u00e5 h\u00e4r:<\/p>\n<pre><code class=\"typescript\">import { NgModule } from '@angular\/core';\nimport { RouterModule, Routes } from '@angular\/router';\nimport { BlogComponent } from '.\/blog.component';\n\nconst routes: Routes = [{ path: '', component: BlogComponent }];\n\n@NgModule({\n  imports: [RouterModule.forChild(routes)],\n  exports: [RouterModule]\n})\nexport class BlogRoutingModule { }\n\n<\/code><\/pre>\n<p>Du kommer att m\u00e4rka att den h\u00e4r routing-filen inneh\u00e5ller en enda route, <code>''<\/code>. Den h\u00e4r routen \u00e4r <code>\/blog<\/code> och riktas mot BlogComponent. Du kan l\u00e4gga till fler komponenter och definiera dessa router i den h\u00e4r filen.<\/p>\n<p>Om du exempelvis vill l\u00e4gga till en komponent som h\u00e4mtar information om ett visst blogginl\u00e4gg s\u00e5 kan du skapa komponenten med det h\u00e4r kommandot:<\/p>\n<p><code class=\"language=bash\">ng generate component blog\/detail<\/code><\/p>\n<p>Det skapar komponenten f\u00f6r blogginformationen och l\u00e4gger till den i blogmodulen. Om du vill l\u00e4gga till en route f\u00f6r den s\u00e5 kan du helt enkelt l\u00e4gga till den i din route-matris:<\/p>\n<pre><code class=\"typescript\">const routes: Routes = [{ path: '', component: BlogComponent },\n                        {path:\"\/:title\",component: DetailComponent}];\n<\/code><\/pre>\n<p>Detta l\u00e4gger till en route som l\u00f6ser upp f\u00f6r <code>blog\/:title<\/code> (till exempel <code>blog\/angular-tutorial<\/code>). Den h\u00e4r matrisen med router \u00e4r lat laddad och ing\u00e5r inte i det ursprungliga paketet.<\/p>\n<h2>Verifiera lat laddning<\/h2>\n<p>Du kan enkelt kontrollera att lat laddning fungerar genom att k\u00f6ra <code>ng serve<\/code> och observera resultatet. L\u00e4ngst ner i utmatningen s\u00e5 b\u00f6r du f\u00e5 n\u00e5got som liknar detta:<\/p>\n<figure style=\"width: 867px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/12\/lazy-loading-verification-via-ng-serve.png\" alt=\"Verifiering av lat laddning med hj\u00e4lp av Angular ng serve.\" width=\"867\" height=\"342\"><figcaption class=\"wp-caption-text\">Verifiering av lat laddning med hj\u00e4lp av Angular <code>ng serve<\/code>.<\/figcaption><\/figure>\n<p>Utmatningen ovan \u00e4r uppdelad i tv\u00e5 delar: <code>Initial Chunk Files<\/code> \u00e4r de filer som laddas n\u00e4r sidan laddas f\u00f6rsta g\u00e5ngen. <code>Lazy Chunk Files<\/code>\u00e4r lat laddad. Bloggmodulen \u00e4r listad i det h\u00e4r exemplet.<\/p>\n<h3>Kontroll av lat laddning med hj\u00e4lp av webbl\u00e4sarens n\u00e4tverksloggar<\/h3>\n<p>Ett annat s\u00e4tt att bekr\u00e4fta lat laddning \u00e4r att anv\u00e4nda fliken <strong>N\u00e4tverk<\/strong> i webbl\u00e4sarens panel Utvecklingsverktyg. (I Windows \u00e4r det <strong>F12<\/strong> f\u00f6r Chrome och Microsoft Edge och <strong>Ctrl<\/strong>&#8211;<strong>Shift<\/strong>&#8211;<strong>I<\/strong> f\u00f6r Firefox. P\u00e5 Mac \u00e4r det <strong>Command<\/strong>&#8211;<strong>Option<\/strong>&#8211;<strong>I<\/strong> f\u00f6r Chrome, Firefox och Safari)<\/p>\n<p>V\u00e4lj filtret <code>JS<\/code> f\u00f6r att endast visa JavaScript-filer som laddats via n\u00e4tverket. Efter den f\u00f6rsta laddningen av appen s\u00e5 b\u00f6r du f\u00e5 n\u00e5got liknande:<\/p>\n<figure style=\"width: 1040px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/12\/lazy-loading-verification-with-devtools-initial.png\" alt=\"Den f\u00f6rsta loggen \u00f6ver nedladdningar av JavaScript som visas i Utvecklingsverktyg.\" width=\"1040\" height=\"603\"><figcaption class=\"wp-caption-text\">Den f\u00f6rsta loggen \u00f6ver nedladdningar av JavaScript som visas i Utvecklingsverktyg.<\/figcaption><\/figure>\n<p>N\u00e4r du navigerar till <code>\/blog<\/code> s\u00e5 kommer du att m\u00e4rka att en ny del, <code>src_app_blog_blog_module_ts.js<\/code>, har laddats. Det betyder att din modul endast beg\u00e4rdes n\u00e4r du navigerade till den routen och att den nyttjar lat laddning. N\u00e4tverksloggen b\u00f6r se ut ungef\u00e4r s\u00e5 h\u00e4r:<\/p>\n<figure style=\"width: 1040px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/12\/lazy-loading-verification-with-devtools.png\" alt=\"Den latladdade modulen visas i nedladdningar som loggas av Utvecklingsverktyg.\" width=\"1040\" height=\"604\"><figcaption class=\"wp-caption-text\">Den latladdade modulen visas i nedladdningar som loggas av Utvecklingsverktyg.<\/figcaption><\/figure>\n\n<h2>Lat laddning vs ivrig laddning<\/h2>\n<p>Som en j\u00e4mf\u00f6relse s\u00e5 kan vi \u00e4ven skapa en modul som laddas ivrigt och se hur detta p\u00e5verkar filstorleken och laddningstiden. F\u00f6r att demonstrera detta s\u00e5 skapar du en modul f\u00f6r autentisering. En s\u00e5dan modul kan beh\u00f6va laddas ivrigt, eftersom autentisering \u00e4r n\u00e5got som du kanske kr\u00e4ver att alla anv\u00e4ndare ska g\u00f6ra.<\/p>\n<p>Generera en AuthModule genom att k\u00f6ra det h\u00e4r kommandot i CLI:<\/p>\n<p><code class=\"language=bash\">ng generate module auth --routing --module app.module<\/code><\/p>\n<p>Det genererar modulen och en routing-fil. Modulen l\u00e4ggs \u00e4ven till i filen <code>app.module.ts<\/code>. Till skillnad fr\u00e5n kommandot som vi anv\u00e4nde f\u00f6r att generera en modul f\u00f6rra g\u00e5ngen, l\u00e4gger det h\u00e4r kommandot dock inte till n\u00e5gon latladdad route. Den anv\u00e4nder parametern <code>--routing<\/code> i st\u00e4llet f\u00f6r <code>--route &lt;name&gt;<\/code>. D\u00e4rmed s\u00e5 l\u00e4ggs autentiseringsmodulen till <code>imports<\/code>-matrisen i <code>app.module.ts<\/code>:<\/p>\n<pre><code class=\"typescript\">@NgModule({\n  declarations: [\n    AppComponent\n  ],\n  imports: [\n    BrowserModule,\n    AppRoutingModule,\n    AuthModule \/\/added auth module\n  ],\n  providers: [],\n  bootstrap: [AppComponent]\n})\n<\/code><\/pre>\n<p>Om du l\u00e4gger till AuthModule i matrisen AppModule imports s\u00e5 l\u00e4ggs autentiseringsmodulen till i de inledande filerna och kommer att inkluderas i JavaScript-huvudpaketet. F\u00f6r att verifiera detta s\u00e5 kan du k\u00f6ra <code>ng serve<\/code> igen och observera resultatet:<\/p>\n<figure style=\"width: 752px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/12\/lazy-loading-verification-angular-auth-module.png\" alt=\"Utdata fr\u00e5n Angular-kommandot ng serve efter att autentiseringsmodulen har lagts till.\" width=\"752\" height=\"332\"><figcaption class=\"wp-caption-text\">Utdata fr\u00e5n Angular-kommandot <code>ng serve<\/code> efter att autentiseringsmodulen har lagts till.<\/figcaption><\/figure>\n<p>Som du kan se \u00e4r autentiseringsmodulen inte inkluderad som en del av de latladdade filerna. Storleken p\u00e5 det ursprungliga paketet har dessutom \u00f6kat. Filen <code>main.js<\/code> har n\u00e4stan f\u00f6rdubblats i storlek, fr\u00e5n 8 KB till 15 KB. I det h\u00e4r exemplet \u00e4r \u00f6kningen liten eftersom komponenterna inte inneh\u00e5ller s\u00e5 mycket kod. Men n\u00e4r du fyller komponenterna med logik s\u00e5 kommer denna filstorlek att \u00f6ka, vilket \u00e4r ett starkt argument f\u00f6r lat laddning.<\/p>\n<h2>Sammanfattning<\/h2>\n<p>Nu har du l\u00e4rt dig hur du anv\u00e4nder lat laddning i Angular f\u00f6r att endast h\u00e4mta moduler n\u00e4r de beh\u00f6vs. Lat laddning \u00e4r en bra teknik f\u00f6r att f\u00f6rb\u00e4ttra laddningstiderna, minska dataanv\u00e4ndningen och utnyttja dina <a href=\"https:\/\/kinsta.com\/blog\/backend-vs-frontend\/\">frontend- och backend<\/a>-resurser\u00a0p\u00e5 ett b\u00e4ttre s\u00e4tt.<\/p>\n<p>Lat laddning, tillsammans med teknik som <a href=\"https:\/\/kinsta.com\/se\/blog\/wordpress-cdn\/\">inneh\u00e5llsdistribueringsn\u00e4tverk<\/a> och <a href=\"https:\/\/kinsta.com\/blog\/minify-javascript\/\">minifiering av JavaScript<\/a>, kommer b\u00e5de att f\u00f6rb\u00e4ttra webbplatsens prestanda och anv\u00e4ndarnas tillfredsst\u00e4llelse.<\/p>\n<p>Om du utvecklar en WordPress-webbplats och verkligen vill \u00f6ka hastigheten s\u00e5 kan du l\u00e4sa om <a href=\"https:\/\/kinsta.com\/se\/blog\/edge-caching\/\">Kinsta&#8217;s Edge Caching<\/a> f\u00f6r att se n\u00e5gra imponerande siffror.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Angular \u00e4r ett JavaScript-ramverk f\u00f6r frontend. Det har utvecklats av Google f\u00f6r byggande av skalbara webbapplikationer i f\u00f6retagsklass. Vissa av dessa applikationer kan bli ganska stora, &#8230;<\/p>\n","protected":false},"author":271,"featured_media":49121,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[756,784],"class_list":["post-49120","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-angular","topic-javascript-sjalvstudier"],"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>Lat Laddning Angular (Anv\u00e4nd detta p\u00e5 din webbplats) - Kinsta\u00ae<\/title>\n<meta name=\"description\" content=\"Att latladda tillg\u00e5ngar kan minska flaskhalsar som h\u00e4mmar din webbplats. 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