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JS圖片成比例縮放代碼,圖片按指定寬度和高度成比例縮小的JS代碼。
<script language="JavaScript">
<!--
//易天科技圖片按比例縮放
var flag=false;
function DrawImage(ImgD,iwidth,iheight){
//易天科技參數(shù)(圖片,允許的寬度,允許的高度)
var image=new Image();
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>

調(diào)用：<img src="images/toplogo.gif" onload="javascript:DrawImage(this,100,100)">