js 图片缩放（按比例）控制代码

缩放代码：

缩放代码： 
<script type="text/javascript"> 
//图片按比例缩放 
var flag = false; 
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) { 
flag = true; 
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; 
} 
ImgD.alt = image.width + "×" + 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; 
} 
ImgD.alt = image.width + "×" + image.height; 
} 
} 
} 
</script> 
页面代码： 
<img onload="javascript:DrawImage(this,89,63)" src="https://3water.com/images/logo.gif" width="89" height="63" border="0" /> 
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页面代码：
1. <img onload="javascript:DrawImage(this,89,63)" src="http://www.baidu.com/img/baidu_logo.gif" width="89" height="63" border="0" />
觉得不错的发个言！