CSS之图片旋转

主方法为:

var Img = function() {
    var T$ = function(id) { return document.getElementById(id); }
    var ua = navigator.userAgent,
        isIE = /msie/i.test(ua) && !window.opera;
    var i = 0, sinDeg = 0, cosDeg = 0, timer = null ;
    var rotate = function(target, degree) {
        target = T$(target);
        var orginW = target.clientWidth, orginH = target.clientHeight;
            clearInterval(timer);
        function run(angle) {
             //兼容IE
            if (isIE) {
                cosDeg = Math.cos(angle * Math.PI / 180);
                sinDeg = Math.sin(angle * Math.PI / 180);
                with(target.filters.item(0)) {
                    M11 = M22 = cosDeg; M12 = -(M21 = sinDeg);
                }
                target.style.top = (orginH - target.offsetHeight) / 2 + 'px';
                target.style.left = (orginW - target.offsetWidth) / 2 + 'px';
		//兼容其他浏览器
            } else if (target.style.MozTransform !== undefined) {
                target.style.MozTransform = 'rotate(' + angle + 'deg)';
            } else if (target.style.OTransform !== undefined) {
                target.style.OTransform = 'rotate(' + angle + 'deg)';
            } else if (target.style.webkitTransform !== undefined) {
                target.style.webkitTransform = 'rotate(' + angle + 'deg)';
            } else {
                target.style.transform = "rotate(" + angle + "deg)";
            }
        }

        timer = setInterval(function() {
            i += 10;
            run(i);
            if (i > degree - 1) {
                i = 0;
                clearInterval(timer);
            }
        }, 10);
    }
    return {rotate: rotate}
}();
window.onload = function() {
    Img.rotate('demo', 720);
    document.getElementById('demo').onclick = function() {
        Img.rotate('demo', 720);
    }
}

点击图片可以旋转：