大家好，伊人来为大家解答以上问题。分外妖娆是什么意思，分外妖娆是啥意思很多人还不知道，现在让我们一起来看看吧！
I\'ve read that if I have a for loop, I should not use string concation because it\'s slow. Such as: for (i=0;i<10000000;i++) {
In one article I have seen that it may be good to clear all expandos on window.unload event to prevent memory leaks.
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