请问为什么非得用 this 而不可以用aLi[i]呢？
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window.onload=function () { var aLi=document.getElementsByTagName('a'); for (var i=0; i |
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同步执行, 循环不会等待你的点击所触发的函数的执行,当你点击的时候,全局变量i已经经过循环变为了length |
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