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浅析回调机制，这是一篇骚骚的文章
source link: https://juejin.im/post/59f92262f265da430b7a8cbe
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序：先给一个，我对回调机制的认识：回调就是我不知道你调用这个 具体 干嘛，但是我知道你 大概 要干嘛比如点击，写源码的人不知道点击按钮之后登陆，还是弹出对话框，但是写源码的人知道按钮加载出来并
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