JS控制图片翻转示例代码（兼容firefox,ie,chrome）

复制代码代码如下:
<！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>图片旋转效果</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<！--把下面代码加到<head>与</head>之间-->
<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 旋转图片ID;
* p 选择旋转方向，固定值为"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>
<！--把下面代码加到<body>与</body>之间-->
<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 图片旋转效果" id="pic_1" src="1.gif" alt="">
        </div>
    </li>
</ul>
</body>
</html>