图片等比例缩放
代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
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<html xmlns="http://www.w3.org/1999/xhtml"> |
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<head> |
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> |
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<title>最新javascript自动按比例显示图片，按比例压缩图片显示</title> |
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<script type="text/javascript"> |
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function AutoResizeImage(maxWidth, maxHeight, objImg) { |
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var img = new Image(); |
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img.src = objImg.src; |
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var hRatio; |
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var wRatio; |
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var Ratio = 1; |
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var w = img.width; |
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var h = img.height; |
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wRatio = maxWidth / w; |
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hRatio = maxHeight / h; |
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if (maxWidth == 0 && maxHeight == 0) { |
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Ratio = 1; |
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} else if (maxWidth == 0) { // |
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if (hRatio < 1) |
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Ratio = hRatio; |
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} else if (maxHeight == 0) { |
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if (wRatio < 1) |
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Ratio = wRatio; |
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} else if (wRatio < 1 || hRatio < 1) { |
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Ratio = (wRatio <= hRatio ? wRatio : hRatio); |
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} |
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if (Ratio < 1) { |
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w = w * Ratio; |
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h = h * Ratio; |
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} |
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objImg.height = h; |
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objImg.width = w; |
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} |
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</script> |
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</head> |
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<body> |
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<br /> |
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原图显示（534 X 800）<br /> |
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onload="AutoResizeImage(0,0,this)<br /> |
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<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 /> |
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1.按宽度250压缩,不限制高度 按比例压缩<br /> |
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onload="AutoResizeImage(250,0,this)"<br /> |
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<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 /> |
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2.按高度250压缩,不限制宽度 按比例压缩<br /> |
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onload="AutoResizeImage(0,250,this)"<br /> |
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<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 /> |
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3.按高度250宽度250 按比例压缩<br /> |
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onload="AutoResizeImage(250,250,this)"<br /> |
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<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 /> |
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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 /> |
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onload="AutoResizeImage(400,512,this)"<br /> |
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<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 /> |
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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 /> |
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onload="AutoResizeImage(300,600,this)"<br /> |
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<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 /> |
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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 /> |
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原图444 x 207,压缩为 500 x 600,将保持原图显示<br /> |
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onload="AutoResizeImage(500,600,this)"<br /> |
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<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 /> |
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</body> |
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</html> |
效果图：
