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JS控制圖片翻轉示例代碼
本篇文章主要介紹了JS控制圖片翻轉示例代碼(兼容firefox,ie,chrome) 需要的朋友可以過來參考下，希望對大家有所幫助
代碼如下: <!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> <title>圖片旋轉效果</title> <meta http-equiv="content-type" content="text/html;charset=gb2312"> <!--把下面代碼加到<head>與</head>之間--> <style type="text/css"> ul{padding:0 15px;} ul li{padding-bottom:15px;border-bottom:1px dashed #EEE;} .caption{padding:15px 0 5px;} .caption input{margin-right:10px;padding:0 10px;} </style> <script type="text/javascript"> /* * www.byzuo.com * ok!: MSIE 6, 7, 8, Firefox 3.6, chrome 4, Safari 4, Opera 10 * o 旋轉圖片ID; * p 選擇旋轉方向，固定值為'left'或'right'; */ function rotate(o,p){ var img = document.getElementById(o); if(!img || !p) return false; var n = img.getAttribute('step'); if(n== null) n=0; if(p=='right'){ (n==3)? n=0:n++; }else if(p=='left'){ (n==0)? n=3:n--; } img.setAttribute('step',n); //MSIE if(document.all) { img.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(rotation='+ n +')'; //HACK FOR MSIE 8 switch(n){ case 0: imgimg.parentNode.style.height = img.height; break; case 1: imgimg.parentNode.style.height = img.width; break; case 2: imgimg.parentNode.style.height = img.height; break; case 3: imgimg.parentNode.style.height = img.width; break; } //DOM }else{ var c = document.getElementById('canvas_'+o); if(c== null){ img.style.visibility = 'hidden'; img.style.position = 'absolute'; c = document.createElement('canvas'); c.setAttribute("id",'canvas_'+o); img.parentNode.appendChild(c); } var ccanvasContext = c.getContext('2d'); switch(n) { default : case 0 : c.setAttribute('width', img.width); c.setAttribute('height', img.height); canvasContext.rotate(0 * Math.PI / 180); canvasContext.drawImage(img, 0, 0); break; case 1 : c.setAttribute('width', img.height); c.setAttribute('height', img.width); canvasContext.rotate(90 * Math.PI / 180); canvasContext.drawImage(img, 0, -img.height); break; case 2 : c.setAttribute('width', img.width); c.setAttribute('height', img.height); canvasContext.rotate(180 * Math.PI / 180); canvasContext.drawImage(img, -img.width, -img.height); break; case 3 : c.setAttribute('width', img.height); c.setAttribute('height', img.width); canvasContext.rotate(270 * Math.PI / 180); canvasContext.drawImage(img, -img.width, 0); break; } } } </script> </head> <body> <!--把下面代碼加到<body>與</body>之間--> <ul class="clearfix"> <li> <div class="caption"> <input type="button" value="turn left" onclick="rotate('pic_1','left')"> <input type="button" value="turn right" onclick="rotate('pic_1','right')"> </div> <div class="cont"> <img alt="javascript 圖片旋轉效果" id="pic_1" src="1.gif" alt=""> </div> </li> </ul> </body> </html>javascript排行
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