JS控制图片翻转示例代码(兼容firefox,ie,chrome)

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>