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JS控制图片显示的大小(图片等比例缩放) |
来源:博客园 更新时间:2010/9/21 16:53:54 阅读次数: 我要投稿 |
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <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://www.cwydesign.com/effects/UploadFiles_7074/201009/2010092116560653.jpg" target="_blank"><img src="http://www.cwydesign.com/effects/UploadFiles_7074/201009/2010092116560653.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 /> <a href="http://www.cwydesign.com" target="_blank"><img src="http://www.cwydesign.com/effects/UploadFiles_7074/201009/2010092116560653.jpg" border="0" width="0" height="0" onload="AutoResizeImage(250,0,this)" alt="250 X 374"/></a><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 /> <a href="http://www.cwydesign.com" target="_blank"><img src="http://www.cwydesign.com/effects/UploadFiles_7074/201009/2010092116560653.jpg" border="0" width="0" height="0" onload="AutoResizeImage(0,250,this)" alt="166 X 250"/></a><br /><br /> 3.按高度250宽度250 按比例压缩<br /> onload="AutoResizeImage(250,250,this)"<br /> <a href="http://www.cwydesign.com" target="_blank"><img src="http://www.cwydesign.com/effects/UploadFiles_7074/201009/2010092116560653.jpg" border="0" width="0" height="0" onload="AutoResizeImage(250,250,this)" alt="200 X 300"/></a><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 /> <a href="http://www.cwydesign.com" target="_blank"><img src="http://www.cwydesign.com/effects/UploadFiles_7074/201009/2010092116560653.jpg" border="0" width="0" height="0" onload="AutoResizeImage(400,512,this)" alt="341 X 512"/></a><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 /> <a href="http://www.cwydesign.com" target="_blank"><img src="http://www.cwydesign.com/effects/UploadFiles_7074/201009/2010092116560653.jpg" border="0" width="0" height="0" onload="AutoResizeImage(300,600,this)" alt="300 X 449"/></a><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 /> <a href="http://www.cwydesign.com" target="_blank"><img src="http://www.cwydesign.com/effects/UploadFiles_7074/201009/2010092116560645.jpg" border="0" width="0" height="0" onload="AutoResizeImage(500,600,this)" alt="444 X 207"/></a><br /><br /> </body> </html> |
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JS控制图片显示的大小(图片等比例缩放) |
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