为什么在html标签里添加ng-app就能使angular的代码识别并加载？
回复内容：
这个很简单，稍微翻翻 angular 源码就知道了angular.js/Angular.js at master · angular/angular.js · GitHub
querySelector + angular.boostrap ( 如果写到 document 上，会省略 querySelector 而更快 )
其实这个问题可以延伸出 angular 的 $compile 模块原理，不过扯开就没完没了了。。。
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