JS控制图片显示的大小（图片等比例缩放）

 1 代码 
 2 
 3 Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 4 <html xmlns="http://www.w3.org/1999/xhtml">
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 7 <title>最新javascript自动按比例显示图片，按比例压缩图片显示</title>
 8 <script type="text/javascript">
 9 function AutoResizeImage(maxWidth,maxHeight,objImg){
10 var img = new Image();
11 img.src = objImg.src;
12 var hRatio;
13 var wRatio;
14 var Ratio = 1;
15 var w = img.width;
16 var h = img.height;
17 wRatio = maxWidth / w;
18 hRatio = maxHeight / h;
19 if (maxWidth ==0 && maxHeight==0){
20 Ratio = 1;
21 }else if (maxWidth==0){//
22 if (hRatio<1) Ratio = hRatio;
23 }else if (maxHeight==0){
24 if (wRatio<1) Ratio = wRatio;
25 }else if (wRatio<1 || hRatio<1){
26 Ratio = (wRatio<=hRatio?wRatio:hRatio);
27 }
28 if (Ratio<1){
29 w = w * Ratio;
30 h = h * Ratio;
31 }
32 objImg.height = h;
33 objImg.width = w;
34 }
35 </script>
36 </head>
37 <body>
38 <br />
39 原图显示（534 X 800）<br />
40 onload="AutoResizeImage(0,0,this)<br />
41 <a href="http://p.blog.csdn.net/images/p_blog_csdn_net/feng_sundy/421506/o_09925c7bcead8c60f683298dacf497a6.jpg" target="_blank"><img src="http://p.blog.csdn.net/images/p_blog_csdn_net/feng_sundy/421506/o_09925c7bcead8c60f683298dacf497a6.jpg" border="0" width="0" height="0" onload="AutoResizeImage(0,0,this)" alt="534 X 800"/></a><br/><br />
42 .按宽度250压缩,不限制高度 按比例压缩<br />
43 onload="AutoResizeImage(250,0,this)"<br />
44 <a href="http://blog.csdn.net/feng_sundy/archive/2008/06/19/2566028.aspx" target="_blank"><img src="http://p.blog.csdn.net/images/p_blog_csdn_net/feng_sundy/421506/o_09925c7bcead8c60f683298dacf497a6.jpg" border="0" width="0" height="0" onload="AutoResizeImage(250,0,this)"  alt="250 X 374"/></a><br /><br />
45 .按高度250压缩,不限制宽度 按比例压缩<br />
46 onload="AutoResizeImage(0,250,this)"<br />
47 <a href="http://blog.csdn.net/feng_sundy/archive/2008/06/19/2566028.aspx" target="_blank"><img src="http://p.blog.csdn.net/images/p_blog_csdn_net/feng_sundy/421506/o_09925c7bcead8c60f683298dacf497a6.jpg" border="0" width="0" height="0" onload="AutoResizeImage(0,250,this)"  alt="166 X 250"/></a><br /><br />
48 .按高度250宽度250 按比例压缩<br />
49 onload="AutoResizeImage(250,250,this)"<br />
50 <a href="http://blog.csdn.net/feng_sundy/archive/2008/06/19/2566028.aspx" target="_blank"><img src="http://p.blog.csdn.net/images/p_blog_csdn_net/feng_sundy/421506/o_09925c7bcead8c60f683298dacf497a6.jpg" border="0" width="0" height="0" onload="AutoResizeImage(250,250,this)"  alt="200 X 300"/></a><br /><br />
51 .高宽不等比例压缩 （400 X 512）,此时高度不变，会自动按高度的比例压缩。<br />
52 onload="AutoResizeImage(400,512,this)"<br />
53 <a href="http://blog.csdn.net/feng_sundy/archive/2008/06/19/2566028.aspx" target="_blank"><img src="http://p.blog.csdn.net/images/p_blog_csdn_net/feng_sundy/421506/o_09925c7bcead8c60f683298dacf497a6.jpg" border="0" width="0" height="0" onload="AutoResizeImage(400,512,this)"  alt="341 X 512"/></a><br /><br />
54 .高宽不等比例压缩 （300 X 600）,此时宽度不变，会自动按宽度的比例压缩。<br />
55 onload="AutoResizeImage(300,600,this)"<br />
56 <a href="http://blog.csdn.net/feng_sundy/archive/2008/06/19/2566028.aspx" target="_blank"><img src="http://p.blog.csdn.net/images/p_blog_csdn_net/feng_sundy/421506/o_09925c7bcead8c60f683298dacf497a6.jpg" border="0" width="0" height="0" onload="AutoResizeImage(300,600,this)"  alt="300 X 449"/></a><br /><br />
57 .如果图片本来的高度和宽度小于压缩的最大高度和宽度，则不会拉大显示图片（按原图显示）<br />
58 原图444 x 207,压缩为 500 x 600,将保持原图显示<br />
59 onload="AutoResizeImage(500,600,this)"<br />
60 <a href="http://blog.csdn.net/feng_sundy/archive/2008/06/19/2566028.aspx" target="_blank"><img src="http://p.blog.csdn.net/images/p_blog_csdn_net/feng_sundy/242776/o_20070410_b7409cd284a0f799a357uePcEFa6ty0X.jpg" border="0" width="0" height="0" onload="AutoResizeImage(500,600,this)"  alt="444 X 207"/></a><br /><br />
61 </body>
62 </html>
效果图：
posted on 2012-12-08 10:13 游鱼阅读(452) 评论(1) 收藏举报