两个JS实现自动按比例缩放图片

两个,JS实现自动按比例缩放图片,但一小BUG 要是图片在下载中,还是会和原先一样大,下载完后才会执行.如果网速慢的话,就会把页面撑地很大.

1、
<script language="JavaScript">
 var flag=false;
 function DrawImage(ImgD){
 var image=new Image();
 image.src=ImgD.src;
 if(image.width>0 && image.height>0){
  flag=true;
  if(image.width/image.height>= 450/338){
   if(image.width>450){
    ImgD.width=450;
    ImgD.height=(image.height*450)/image.width;
   }else{
    ImgD.width=image.width;
    ImgD.height=image.height;
   }
    ImgD.alt=image.width+"×"+image.height;
   }
   else{
    if(image.height>338){
     ImgD.height=338;
     ImgD.width=(image.width*338)/image.height;
    }else{
     ImgD.width=image.width;
     ImgD.height=image.height;
    }
   ImgD.alt=image.width+"×"+image.height;
   }
  }
 }
</script>

 〈IMG src="<%= url %>" onload="javascript:DrawImage(this);"〉

<script language="javascript">
function DImage(ImgD){
    var image=new Image();
  //  alert(ImgD.src);
    image.src= ImgD.src;
    if(image.width>0 && image.height>0){
        //flag=true;
        if(image.height>=100){
            ImgD.height=100;
            ImgD.width=(image.width*100)/image.height;
        }else{
            ImgD.width=image.width;
            ImgD.height=image.height;
        } 
    }
}

</script>

     〈img border="0" src="<%=info.getReserve2() %>" onload="javascript:DrawImage(this);"〉