anchor.diff:    You'll need polyfills to run an Angular application in most browsers as explained
     in the [_Browser Support_](browser-support.html) guide.
   
  +  我们在[_浏览器支持_](browser-support.html)章节里解释过，Angular应用要能在大多数的浏览器里运行，它还需要一些polyfills。
  +
     Polyfills should be bundled separately from the application and vendor bundles.
     Add a `polyfills.ts` like this one to the `src/` folder.
  +
  +  Polyfills最好跟应用代码和vendor代码区分开来单独打包，所以我们需要在`src/`文件夹里添加一个`polyfills.ts`文件，代码如下：
   
   +makeExample('webpack/ts/src/polyfills.ts', '', 'src/polyfills.ts')(format=".")
   
  
positive.code:     especially the [_Typescript configuration_](../guide/typescript-configuration.html) and
      [_npm packages_](../guide/npm-packages.html) guides.
  
      Webpack, the plugins, and the loaders are also installed as packages. 
      They are listed in the updated `packages.json`.
  
  :marked
    Open a terminal window and (re)install the *npm* packages
  code-example(language="sh" class="code-shell").
    npm install
  
  
negative.code:   After that brief orientation, you are ready to build your own Webpack configuration for Angular apps.
  
    经过简短的培训之后，我们准备为Angular应用构建一份自己的Webpack配置了。
  
    Begin by setting up the development environment.
  
    从设置开发环境开始。
  