JQuery众多常用方法中很经常会用到回调函数, 理解好js callback函数定义及用法,我们就可以利用callback函数帮我们做很多事情啦! A callback is a function that is passed as an argument to another function and is executed after its parent function has completed. 这是js对callback函数的解析,意思是:callback函数是一个以参数形式传递
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