通俗理解「回調函數」

咱們先來看看回調的英文定義：ajax A callback is a function that is passed as an argument to another function and is executed after its parent function has completed。函數 字面上的理解，回調函數就是一個參數，將這個函數做爲參數傳到另外一個函數裏面，當那個函數執行完以

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