如何在 Angular 中动态加载外部脚本?

问题描述

我有这个模块将外部库与附加逻辑一起组件化，而无需将 <script> 标签直接添加到 index.html 中:

I have this module which componentize the external library together with additional logic without adding the <script> tag directly into the index.html:

import 'http://external.com/path/file.js'
//import '../js/file.js'

@Component({
    selector: 'my-app',
    template: `
        <script src="http://iknow.com/this/does/not/work/either/file.js"></script>
        <div>Template</div>`
})
export class MyAppComponent {...}

我注意到 ES6 规范中的 import 是静态的，并且在 TypeScript 转译期间而不是在运行时解析.

I notice the import by ES6 spec is static and resolved during TypeScript transpiling rather than at runtime.

无论如何要使其可配置，以便 file.js 将从 CDN 或本地文件夹加载?如何告诉 Angular 2 动态加载脚本?

Anyway to make it configurable so the file.js will be loading either from CDN or local folder?How to tell Angular 2 to load a script dynamically?

推荐答案

如果你使用 system.js，你可以在运行时使用 System.import():

If you're using system.js, you can use System.import() at runtime:

export class MyAppComponent {
  constructor(){
    System.import('path/to/your/module').then(refToLoadedModule => {
      refToLoadedModule.someFunction();
    }
  );
}

如果您使用 webpack，您可以通过 充分利用其强大的代码拆分支持require.ensure :

If you're using webpack, you can take full advantage of its robust code splitting support with require.ensure :

export class MyAppComponent {
  constructor() {
     require.ensure(['path/to/your/module'], require => {
        let yourModule = require('path/to/your/module');
        yourModule.someFunction();
     });
  }
}

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