本文實(shí)例講述了JS圖片等比例縮放方法。分享給大家供大家參考，具體如下：
<!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自動(dòng)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 /><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>更多關(guān)于JavaScript相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《JavaScript切換特效與技巧總結(jié)》、《JavaScript查找算法技巧總結(jié)》、《JavaScript動(dòng)畫(huà)特效與技巧匯總》、《JavaScript錯(cuò)誤與調(diào)試技巧總結(jié)》、《JavaScript數(shù)據(jù)結(jié)構(gòu)與算法技巧總結(jié)》、《JavaScript遍歷算法與技巧總結(jié)》及《JavaScript數(shù)學(xué)運(yùn)算用法總結(jié)》
希望本文所述對(duì)大家JavaScript程序設(shè)計(jì)有所幫助。
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