通俗理解“回调函数”

咱们先来看看回调的英文定义：ajax A callback is a function that is passed as an argument to another function and is executed after its parent function has completed。函数 字面上的理解，回调函数就是一个参数，将这个函数做为参数传到另外一个函数里面，当那个函数执行完以

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