anchor.diff:      There are no **leading slashes** in our **path**. The router parses and builds the URL for us,
       allowing us to use relative and absolute paths when navigating between application views.
   
  -    在**path**中**不用斜线`/`**开头。路由器会为我们解析和生成URL，以便在多个视图间导航时，可以自由使用相对路径和绝对路径。
  +    **path**中**不能用斜线`/`**开头。路由器会为我们解析和生成URL，以便在多个视图间导航时，可以自由使用相对路径和绝对路径。
   
       The `:id` in the third route is a token for a route parameter. In a URL such as `/hero/42`, "42"
       is the value of the `id` parameter. The corresponding `HeroDetailComponent`
  
positive.code:   But most of the time we navigate as a result of some user action such as the click of
    an anchor tag.
  
    现在，我们已经有了配置好的一些路由，还找到了渲染它们的地方，但又该如何导航到它呢？固然，我们从浏览器的地址栏直接输入URL也能做到，但是大多数情况下，导航是某些用户操作的结果，比如点击一个A标签。
  
    We add a **`RouterLink`** directive to the anchor tag and bind it to a template expression that
    returns an array of route link parameters (the **link parameters array**). The router ultimately resolves that array
  
negative.code:     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.
  
      请点击右上角的蓝色'X'按钮以弹出预览窗口，这样可以看到浏览器地址栏的变化情况。
  
  .l-main-section
  
  