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qwwee
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樓主  發(fā)表于: 2009-09-11 18:15
上升沿和下降沿固然有很多好處，但是，大量使用，或有些地方可以不用，究竟是用好還是不用好，對待上升沿和下降沿究竟是不得不用時(shí)才用，還是能用時(shí)就用？
neilnie
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1樓  發(fā)表于: 2009-09-11 18:29
有必要就用嗎，沒(méi)什么限制。
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