原理： “margin-bottom:-1000px;”和“padding-bottom:1000px;”
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<style type="text/css">body{margin:0;}#all{ width:700px; margin:0 auto; overflow:hidden;}#left,#center,#right{ margin-bottom:-1000px; padding-bottom:1000px;}#left{ float:left; width:200px; }#center{ float:left; width:300px; }#right{ float:left; width:200px; }</style><body><div id="all"> <div id="left"> <p>left</p> <p>left</p> <p>left</p> <p>left</p> <p>left</p> </div> <div id="center">333</div> <div id="right"></div></div>
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原文：http://www.cnblogs.com/xuhuinan/p/3901808.html