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js实现控制图片的大小(可运行)



01 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
02 <html xmlns="http://www.w3.org/1999/xhtml">
03 <head>
04 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
05 <title>最新javascript自动按比例显示图片,按比例压缩图片显示</title>
06 <script type="text/javascript">
07 function AutoResizeImage(maxWidth, maxHeight, objImg) {
08    var img = new Image();
09    img.src = objImg.src;
10    var hRatio;
11    var wRatio;
12    var Ratio = 1;
13    var w = img.width;
14    var h = img.height;
15    wRatio = maxWidth / w;
16    hRatio = maxHeight / h;
17    if (maxWidth == 0 && maxHeight == 0) {
18        Ratio = 1;
19    } else if (maxWidth == 0) { //
20        if (hRatio < 1)
21            Ratio = hRatio;
22    } else if (maxHeight == 0) {
23        if (wRatio < 1)
24            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 1.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 2.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 3.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 4.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 5.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 6.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>

来源:http://www.cnblogs.com/xiaochaohuashengmi/archive/2010/06/01/1749571.html

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