<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>最新javascript自動按比例顯示圖片，按比例壓縮圖片顯示</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 /> 原圖顯示（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.按寬度250壓縮,不限制高度 按比例壓縮<br /> onload="AutoResizeImage(250,0,this)"<br /> <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 /> 2.按高度250壓縮,不限制寬度 按比例壓縮<br /> onload="AutoResizeImage(0,250,this)"<br /> <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 /> 3.按高度250寬度250 按比例壓縮<br /> onload="AutoResizeImage(250,250,this)"<br /> <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 /> 4.高寬不等比例壓縮 （400 X 512）,此時高度不變，會自動按高度的比例壓縮。<br /> onload="AutoResizeImage(400,512,this)"<br /> <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 /> 5.高寬不等比例壓縮 （300 X 600）,此時寬度不變，會自動按寬度的比例壓縮。<br /> onload="AutoResizeImage(300,600,this)"<br /> <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 /> 6.如果圖片本來的高度和寬度小於壓縮的最大高度和寬度，則不會拉大顯示圖片（按原圖顯示）<br /> 原圖444 x 207,壓縮為 500 x 600,將保持原圖顯示<br /> onload="AutoResizeImage(500,600,this)"<br /> <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 /> </body> </html>