Js中关于top、clientTop、scrollTop、offsetTop等

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http://www.cnblogs.com/freewind/archive/2008/05/20/1203183.html

一个重要的实例，选摘处忘记了

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Js中 关于top、clientTop、scrollTop、offsetTop等

Js中关于top、clientTop、scrollTop、offsetTop等