以前的贴子发过
<script>
function
DrawImage(ImgD){
var
image=new
Image();
var
iwidth
=
120;
//定义允许图片宽度
var
iheight
=
90;
//定义允许图片高度
image.src=ImgD.src;
if(image.width>0
&&
image.height>0){
flag=true;
if(image.width/image.height>=
iwidth/iheight){
if(image.width>iwidth){
ImgD.width=iwidth;
ImgD.height=(image.height*iwidth)/image.width;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
ImgD.alt=image.width+"×"+image.height;
}
else{
if(image.height>iheight){
ImgD.height=iheight;
ImgD.width=(image.width*iheight)/image.height;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
ImgD.alt=image.width+"×"+image.height;
}
}
}
</script>
<html><body>
<img
src="http://img.blog.
name="dd"
onload="DrawImage(this);">
</body>
</html>
自己可以根据自己的需要去修改成适合的~~~