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<!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>
<script type="text/javascript">
function AutoResizeImage(maxWidth,maxHeight,objImg){
var img=new Image();
img.src=objImg.src;
var realHeight=img.height;//图片真实高度
var realWidth=img.width;//图片真实宽度
if(realWidth<maxWidth&&realHeight>maxHeight){
objImg.width=maxHeight*realWidth/realHeight;
objImg.height=maxHeight;
}
else if(realWidth>maxWidth&&realHeight<maxHeight){
objImg.width=maxWidth;
objImg.height=realHeight*maxWidth/realWidth;
}
else if(realWidth<=maxWidth&&realHeight<=maxHeight){
objImg.height=realHeight;
objImg.width=realWidth;
}
else{
var rateHeight=realHeight/maxHeight;
var rateWeight=realWidth/maxWidth;
if(rateHeight<rateWeight)
{
objImg.width=maxWidth;
objImg.height=realHeight*maxWidth/realWidth;
}
else
{
objImg.height=maxHeight;
objImg.width=maxHeight*realWidth/realHeight;
}
}
}
</script>
</head>
<body>
<div style=" background:#f00; width:500px; height:800px;">
<img src="u.jpg" border=0 onload="javascript:AutoResizeImage(120,160,this)">
</div>
</body>
</html>
虽然能实现等比缩放，总感觉代码太菜了。。。求指教。。。。
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原文地址：http://www.cnblogs.com/thekingofreturn/p/4318658.html
