anchor.diff:    1. Implement `gotoDetail` by calling the `router.navigate` method
   
     1. 实现`gotoDetail`，调用`router.navigate`方法
  -
  +  
   +makeExcerpt('app/heroes.component.ts', 'gotoDetail')
   :marked
     Note that we're passing a two-element **link parameters !{_array}**
  
positive.code: 
  :marked
    #### Add navigation to the template
  
    #### 添加导航到模版中
  
    Finally, add a dashboard navigation link to the template, just above the *Heroes* link.
  
    最后，在模板上添加一个到仪表盘的导航链接，就放在*Heroes（英雄列表）*链接的上方。
  
  - var _vers = _docsFor == 'dart' ? '' : '.1'
  +makeExcerpt('app/app.component' + _vers + '.ts', 'template-v3')
  
  
negative.code:     :marked
        To see the URL changes in the browser address bar,
        pop out the preview window by clicking the blue 'X' button in the upper right corner:
    
        注意看浏览器地址栏中的URL变化，点击右上角的蓝色'X'按钮，弹出预览窗口。
  
  .l-main-section
  