自己写的一个非常简单的图片微缩JS代码，当然网上有很多类似的代码，在此确实是献丑了。
主要方法写在SetImgSize.js里面
![]()
http://www.blue1000.com/bkhtml/2006-10/none'; Code_Closed_Text_153844.style.display='none'; Code_Open_Image_153844.style.display='inline'; Code_Open_Text_153844.style.display='inline';" height=16 src="http://www.blue1000.com/upload/2006_10/061029104078291.gif" width=11 align=top>![]()
http://www.blue1000.com/bkhtml/2006-10/none'; Code_Open_Text_153844.style.display='none'; Code_Closed_Image_153844.style.display='inline'; Code_Closed_Text_153844.style.display='inline';" height=16 src="http://www.blue1000.com/upload/2006_10/061029104078292.gif" width=11 align=top>SetImgSize.js
<--Code highlighting produced by Actipro CodeHighlighter (freeware)
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--> 1 //智能微缩图片JS方法
2 //参数：imgID（图片的标识ID）
3 //参数：maxWidth（图片的最大宽度，值为0则表示不限制宽度）
4 //参数：maxHeight（图片的最大高度，值为0则表示不限制高度）
5 function setImgSize(imgID,maxWidth,maxHeight)
6 {
7 var img = document.images[imgID];
8 if(maxWidth < 1)
9 {
10 if(img.height > maxHeight)
11 {
12 img.height = maxHeight;
13 }
14 return true;
15 }
16 if(maxHeight < 1)
17 {
18 if(img.width > maxWidth)
19 {
20 img.width = maxWidth;
21 }
22 return true;
23 }
24 if(img.height > maxHeight || img.width > maxWidth)
25 {
26 if((img.height / maxHeight) > (img.width / maxWidth))
27 {
28 img.height = maxHeight;
29 }
30 else
31 {
32 img.width = maxWidth;
33 }
34 return true;
35 }
36 } 功能实现原理是在图片加载完毕后（onload事件）用JS实现微缩。
下面是一个测试用的文件test.htm
![]()
http://www.blue1000.com/bkhtml/2006-10/none'; Code_Closed_Text_154020.style.display='none'; Code_Open_Image_154020.style.display='inline'; Code_Open_Text_154020.style.display='inline';" height=16 src="http://www.blue1000.com/upload/2006_10/061029104078291.gif" width=11 align=top>
![]()
http://www.blue1000.com/bkhtml/2006-10/none'; Code_Open_Text_154020.style.display='none'; Code_Closed_Image_154020.style.display='inline'; Code_Closed_Text_154020.style.display='inline';" height=16 src="http://www.blue1000.com/upload/2006_10/061029104078292.gif" width=11 align=top>
test.htm
<--Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/
--> 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xHTML1/DTD/xHTML1-transitional.dtd">
2 <HTML XMLns="http://www.w3.org/1999/xHTML" >
3 <head>
4 <title>测试</title>
5 <script language="JavaScript" type="text/JavaScript" src="setImgSize.js"></script>
6 </head>
7 <body>
8 限定了宽度150px
9 <br /><img alt="" id="img1" onload="setImgSize('img1',150,0);" src="http://img.poco.cn/photo/20060602/972374149620060602140117_1.jpg" />
10 <br />限定了高度150px
11 <br /><img alt="" id="img2" onload="setImgSize('img2',0,150);" src="http://img.poco.cn/photo/20060602/972374149620060602140117_4.jpg" />
12 <br />限定了高度150px、宽度150px
13 <br /><img alt="" id="img3" onload="setImgSize('img3',150,150);" src="http://static.flickr.com/46/147572720_8b25471150_o.jpg" />
14 </body>
15 </HTML>
源码下载 SetImgSize.rar 
.text:''):(d.getSelection?d.getSelection():'');void(keyit=window.open('http://my.poco.cn/fav/storeIt.php?t='+escape(d.title)+'&u='+escape(d.location.href)+'&c='+escape(t)+'&img=http://www.h-strong.com/blog/logo.gif','keyit','scrollbars=no,width=475,height=575,status=no,resizable=yes'));keyit.focus();){kind=link}