//图片等比例缩放
<
html
>
<
head
>
<
title
>等比例缩放图片</
title
>
<
script
>
function DrawImage(ImgD,iwidth,iheight){
//参数(图片,允许的宽度,允许的高度)
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
=
"/images/logo.gif"
alt
=
"自动缩放后的效果"
width
=
"220"
height
=
"80"
onload
=
"javascript:DrawImage(this,100,100)"
/>
</
body
>
</
html
>