<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title><style type="text/css">* { margin:0;padding:0;}#wrap {background:#00C;margin:0 auto;width:960px;}#header {background:#FF3300;width:100%;}#mainbody { background:#FC0; clear:both;}.left {width:800px;height:200px;background:#000; float:left;}.right {width:140px;height:500px;background:#690; float:right;}#footer {background:#639;width:100%;}</style></head><body><div id="wrap"> <div id="header">头部</div> <div id="mainbody"> <div class="left"></div> <div class="right"></div> </div> <div id="footer">版权部分</div></div></body></html>clear:both;清除其后元素的浮动，它清除了那个浮动？不懂？
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