本文实例讲述了JS图片等比例缩放方法。分享给大家供大家参考，具体如下：
<!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=gb2312" /> <title>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 /> <img src="1.jpg" border="0" width="0" height="0" onload="AutoResizeImage(100,0,this)" /> width:100px <br /> <br /> <img src="1.jpg" border="0" width="0" height="0" onload="AutoResizeImage(0,100,this)" /> height:100px <br /> <br /> <img src="1.jpg" border="0" width="0" height="0" onload="AutoResizeImage(100,100,this)" /> width:100px height:100px <br /> <br /> <br /> <br /> <br /> <br /> <br /> </body> </html>
希望本文所述对大家JavaScript程序设计有所帮助。
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