javascript 图片等比例缩放

<SCRIPT LANGUAGE="JavaScript">
<!--
//图片等比例缩放

var FitWidth = 250; //图片宽度
var FitHeight = 176; //图片高度
function ResizePic(ImgTag)
{
var image = new Image();
image.src = ImgTag.src;
if(image.width>0 && image.height>0){
if(image.width/image.height >= FitWidth/FitHeight){
if(image.width > FitWidth){
ImgTag.width = FitWidth;
ImgTag.height = (image.height*FitWidth)/image.width;
}
else{
ImgTag.width = image.width;
ImgTag.height = image.height;
}
}
else{
if(image.height > FitHeight){
ImgTag.height = FitHeight;
ImgTag.width = (image.width*FitHeight)/image.height;
}
else{
ImgTag.width = image.width;
ImgTag.height = image.height;
}
}
}
}
-->
</script>

为了避免加载时图片暂时没有缩小，可以将图片设置一个默认的大小。
<img width="30" height="30" src="../honor/1.jpg" onload="javascript:ResizePic(this)">
<img width="30" height="30" src="../honor/2.jpg" onload="javascript:ResizePic(this)">
<img width="30" height="30" src="../honor/3.jpg" onload="javascript:ResizePic(this)">