js比例缩小显示图片

设定图片最大允许显示的尺寸

<SCRIPT LANGUAGE="JavaScript">

<!--

function DownImage(ImgD,MaxWidth,MaxHeight){

var image=new Image();

image.src=ImgD.src;

if(image.width>0 && image.height>0){

var rate = (MaxWidth/image.width < MaxHeight/image.height)?MaxWidth/image.width:MaxHeight/image.height;

if(rate <= 1){

ImgD.width = image.width*rate;

ImgD.height =image.height*rate;

}

}

}

//-->

</SCRIPT>

<img src="1.jpg" border="0" id="img" onload="DownImage(this,130,130);"/>