anchor.diff:    The application is bigger because it includes the Angular compiler
     and a lot of library code that the application won't actually need.
     Bigger apps take longer to transmit and are slower to load.
  +  
     JIT编译导致运行期间的性能损耗。
     由于需要在浏览器中执行这个编译过程，视图需要花更长时间才能渲染出来。
     由于应用包含了Angular编译器以及大量实际上并不需要的库代码，所以文件体积也会更大。
     更大的应用需要更长的时间进行传输，加载也更慢。
  +  
     Compilation can uncover many component-template binding errors.
     JIT compilation discovers them at runtime, which is late in the process.
   
  
positive.code:   A few minor changes to the lone `app.component` lead to these two class and HTML files:
  
    AOT编译需要一些简单的准备步骤。我们先从<a href='../guide/setup.html'>搭建本地开发环境</a>开始。
    只要单独对`app.component`文件的类文件和html文件做少量修改就可以了。
  
  +makeTabs(
    `cb-aot-compiler/ts/src/app/app.component.html,
  
negative.code: :marked
    ***Compiling the application***
  
    *** 编译该应用 ***
  
    Initiate AOT compilation from the command line using the previously installed `ngc` compiler by executing:
  
  