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js判斷設備是否為PC並調整圖片大小
這篇文章主要介紹了js判斷設備是否為PC並調整圖片大小,需要的朋友可以參考下
代碼如下: <html> <head> <script type="text/javascript"> /* 判斷設備是否為PC */ function isPC() { var userAgentInfo = navigator.userAgent; var Agents = new Array("Android", "iPhone", "SymbianOS","Windows Phone", "iPad", "iPod"); var flag = true; for ( var v = 0; v < Agents.length; v++) { if (userAgentInfo.indexOf(Agents[v]) > 0) { flag = false; break; } } return flag; } /* 調整圖片大小 */ 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; } /* 設置不同設備的縮放策略 */ function setImg(tagid,pcWidth,pcHeight,appWidth,appHeight){ var tag=document.getElementById(tagid); var images=tag.getElementsByTagName("img"); for(var i=0;i<images.length;i++){ if(isPC){ AutoResizeImage(pcWidth, pcHeight, images[i]); }else{ AutoResizeImage(appWidth, appHeight, images[i]); } } } window.onload=function(){ setImg('imgDIV',300,0,300,0); } </script> </head> <body> <div id="imgDIV"> <img alt="" src="http://192.168.1.116:9999/ffzx/news/20140205/015212022_1.jpg" /> <div> <img alt="" src="http://192.168.1.116:9999/ffzx/news/20140208/1386835169183.jpg" /> </div> </div> <br> </body> </html>javascript排行
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