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                ## 什么是閉包?請寫一個閉包的簡單例子 ~~~ function a() { // 函數a的變量i被函數b引用了,所以變量i是不會被垃圾回收的 var i=0 function b() { alert(++i) } return b } var c=a() c() c() c() c() ~~~ <span style="color:red">閉包就是</span>(能夠讀取其他函數內部變量的)<span style="color:red">函數</span>,函數b就是閉包 這樣可以保護內部變量不那么容易被誤修改
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