图片等比缩放后为什么时大时小?解决思路

图片等比缩放后为什么时大时小?
<script language="javascript"> 
var flag=false; 
function MyImage(Img){ 
var WIDTH=600;
var HEIGHT=600;
var image=new Image(); 
image.src=Img.src; 
width=WIDTH
height=HEIGHT;
if(image.width>width||image.height>height){
w=image.width/width; 
h=image.height/height; 
if(w>h){
Img.width=width; 

Img.height=image.height/w; 

}else{
Img.height=height; 

Img.width=image.width/h; 
} 
} 
} 
</script> 
<img src='images/ppd14.jpg' onload='javascript:MyImage(this)' border='0'>
以上是代码，麻烦各位大侠帮忙解决下，谢谢了．

[解决办法]
应该是你用onload='javascript:MyImage(this)'导入，网页就先加载原图片，再调用你的JS

代码改成如下试试

JScript code

<img src='Winter.jpg' id="im" border='0'> <script language="javascript"> var flag=false; function MyImage(Img){ var WIDTH=600; var HEIGHT=600; var image=new Image(); image.src=Img.src; width=WIDTH height=HEIGHT; if(image.width>width ||image.height>height){ w=image.width/width; h=image.height/height; if(w>h){ Img.width=width; Img.height=image.height/w; }else{ Img.height=height; Img.width=image.width/h; } } } MyImage(im);</script>