<html><head><title>等比例縮放圖片</title><script>function
DrawImage(ImgD,iwidth,iheight){ //參數(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){ 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;
}
}else{
if(image.height>iheight){
ImgD.height=iheight;
ImgD.width=(image.width*iheight)/image.height;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
}
}
}
</script></head><body><img
src=//www.49028c.com/uploadfile/2013/0803/20130803034531502.jpg"
alt="自動縮放后的效果"
width="100"
height="100"
onload="javascript：DrawImage(this,80,80)"
/></body></html>
