经过几个实例理解 JS回调函数 callback

基本理解一个概念 回调函数回头再调用函数，等主干事情干完了，再回头干分支上的事情。javascript 官方定义 A callback is a function that is passed as an argument to another function and is executed after its parent function has completed.java 实例1 //定

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