已经解决 但是不知道问题是在什么地方~~~~~
<!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">
* {
padding:0;
margin:0;
}
.box {
width:900px;
margin:0 auto;
}
.header {
background:#999;
height:100px;
width:900px;
}
.wrap {
width:900px;
clear:both;
overflow:hidden;
}
.left {
float:left;
width:200px;
background:#F00;
padding-bottom:10000px;
margin-bottom:-10000px;
}
.right {
float:right;
width:700px;
height:500px;
background:#FF0;
z-index:100;
position:relative;
}
.right_t {
background:#090;
height:100px;
width:700px;
margin-top:400px;
}
.foot {
height:200px;
background:#CCC;
margin-top:-100px;
z-index:1;
position:relative;
}
</style>
</head>
<body>
<div class="box">
<div class="header"></div>
<div class="wrap">
<div class="left"></div>
<div class="right">
<div class="right_t"></div>
</div>
</div>
<div class="foot"></div>
</div>
</body>
</html>
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