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img等比缩放demo.html
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img等比缩放demo.html
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>自动按比例显示图片，按比例压缩图片显示</title>
<script type="text/javascript">
function AutoResizeImage(maxWidth, maxHeight, objImg) {
var img = new Image();
img.src = objImg.src;
var hRatio;
var wRatio;
var Ratio = 1;
var w = img.width;
var h = img.height;
wRatio = maxWidth / w;
hRatio = maxHeight / h;
if (maxWidth == 0 && maxHeight == 0) {
Ratio = 1;
} else if (maxWidth == 0) {//
if (hRatio < 1) Ratio = hRatio;
} else if (maxHeight == 0) {
if (wRatio < 1) Ratio = wRatio;
} else if (wRatio < 1 || hRatio < 1) {
Ratio = (wRatio <= hRatio ? wRatio : hRatio);
}
if (Ratio < 1) {
w = w * Ratio;
h = h * Ratio;
}
objImg.height = h;
objImg.width = w;
}
</script>
</head>
<body>
<br/>
原图显示（534 X 800）<br/>
onload="AutoResizeImage(0,0,this)<br/>
<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/>
1.按宽度250压缩,不限制高度 按比例压缩<br/>
onload="AutoResizeImage(250,0,this)"<br/>
<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"/><br/><br/>
2.按高度250压缩,不限制宽度 按比例压缩<br/>
onload="AutoResizeImage(0,250,this)"<br/>
<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"/><br/><br/>
3.按高度250宽度250 按比例压缩<br/>
onload="AutoResizeImage(250,250,this)"<br/>
<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"/><br/><br/>
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/>
onload="AutoResizeImage(400,512,this)"<br/>
<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"/><br/><br/>
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/>
onload="AutoResizeImage(300,600,this)"<br/>
<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"/><br/><br/>
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/>
原图444 x 207,压缩为 500 x 600,将保持原图显示<br/>
onload="AutoResizeImage(500,600,this)"<br/>
<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"/><br/><br/>
</body>
</html>