anchor.diff:    **Add a component file** named *app.component.ts* and paste the following lines:
     **添加一个组件文件** ，命名为 *app.component.ts* 并粘贴下列代码：
   +makeExample('quickstart/ts/app/app.component.ts', null, 'app/app.component.ts')(format=".")
  -  
  +
   .l-verbose-section
     :marked
       ### AppComponent is the root of the application
  
positive.code:     metadata, finds the `my-app` selector, locates an element tag named `my-app`,
      and loads our application between those tags.
  
  .l-main-section
  :marked
    ## Add some style
    Styles aren't essential but they're nice and the `index.html` assumes we have
    a stylesheet called `styles.css`.
  
    Create a `styles.css` in the root folder and start styling, perhaps with this set:
  +makeExample('quickstart/ts/styles.1.css', null, 'styles.css (excerpt)')(format=".")
  
  .l-main-section
  :marked
    ## Compile and run!
    
    Open a terminal window and enter this command:
  code-example(format="").
    npm start
  :marked
  
negative.code:     当我们需要一个模块中的某些东西时，我们引入（import）它。
      在这里，我们从Angular的主模块中引入了`Component`装饰器，我们需要它来定义我们的组件。
  
    +makeExample('quickstart/ts/app/app.component.ts', 'import', 'app/app.component.ts (导入)')(format=".")
  
    a(id="component-decorator")
    :marked
  