<!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">
<title>css等比例缩小图片</title>
<head>
<style type="text/css">
<!--
body {
text-align: center;
margin: 20px auto;
padding: 0px;
font-size:14px;
color:red
}
#pic{
margin:5px auto;
width:500px;
padding:0;
border:1px solid #333;
}
#pic img{
max-width:200px;
width:expression(document.body.clientWidth > 200?"200px":"auto" );
display:block;
border:0
}
-->
</style>
</head>
<body>将宽度强制为200px后图片高度被等比例缩小
<div id="pic">
<a href="#"><img src="wall5.jpg" /></a>
</div>
原图：
<br />
<img src="wall5.jpg" />
</body>