JS回调函数--简单易懂有实例

　　初学js的时候，被回调函数搞得很晕，如今回过头来总结一下什么是回调函数。html 　　咱们先来看看回调的英文定义：A callback is a function that is passed as an argument to another function and is executed after its parent function has completed。web 　　字面上的

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