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<script type="text/javascript">
function init(){
var img = document.getElementById(‘the_img‘);
var width = img.width;
var height = img.height;
var div = img.parentNode;
var w = div.offsetWidth;
var h = div.offsetHeight;
if(width < w && height < h)
return;
if(width/height > w/h){
img.width = w - 20;
img.height = (w-20) * (h-20) / width;
}
}
</script>
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<style>
div{width:100px;height:200px;border:1px solid black;margin:10px auto;padding:10px;}
</style>
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<body style="text-align:center" onload="init();">
<div>
<img src="1.jpg" id="the_img"/>
</div>
</body>
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原文地址：http://www.cnblogs.com/hanxuming/p/5920392.html
