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javascript图片缩放

在处理网页图片时，特别是一些图片列表的应用里面，很难保证图片统一大小，直接设置图片大小又会导致图片拉伸，造成图片模糊，本文介绍的代码可以在图片加载完成后自动按比例调整图片大小。
Javascript：
<script language="javascript" type="text/javascript">
<!--
// 说明：用 JavaScript 实现网页图片等比例缩放
// 整理：http://www.CodeBit.cn
function DrawImage(ImgD,FitWidth,FitHeight)
{
var image=new Image();
image.src=ImgD.src;
if(image.width>0 && image.height>0)
{
if(image.width/image.height>= FitWidth/FitHeight)
{
if(image.width>FitWidth)
{
ImgD.width=FitWidth;
ImgD.height=(image.height*FitWidth)/image.width;
}
else
{
ImgD.width=image.width;
ImgD.height=image.height;
}
}
else
{
if(image.height>FitHeight)
{
ImgD.height=FitHeight;
ImgD.width=(image.width*FitHeight)/image.height;
}
else
{
ImgD.width=image.width;
ImgD.height=image.height;
}
}
}
}
//-->
<script>
调用方式：
Code:
<img src="1148202890.jpg" alt="自动缩放后的效果" onload="javascript:DrawImage(this,200,200);" />
如果图片较大，建议在图片标签里面同时设置期望的图片大小，这样不会导致页面在加载中撑开，该大小不会影响最终缩放效果。可以修改上面的代码为：
Code:
<img src="1148202890.jpg" alt="自动缩放后的效果" width="200" height="200" onload="javascript:DrawImage(this,200,200);"/>