經過幾個實例理解 JS回調函數 callback

基本理解一個概念 回調函數回頭再調用函數，等主幹事情幹完了，再回頭幹分支上的事情。javascript 官方定義 A callback is a function that is passed as an argument to another function and is executed after its parent function has completed.java 實例1 //定

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