实现图片等比例缩放的js代码

<script type="text/javascript">
var imgObj = new Image();
imgObj.src=document.getElementById("img1").src;

 

if(imgObj.width>500)
{var rw=imgObj.width;
document.all("img1").width=500;
document.all("img1").height=500/rw*document.all("img1").height;
}
</script>

 

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