jquery简单的拖动效果

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<!DOCTYPE html><html><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>简单拖曵原理实例</title><style type="text/css">    #drag{width:400px;height:300px;background:url(http://upload.yxgz.cn/uploadfile/2009/0513/20090513052611873.jpg);cursor:move;position:absolute;top:100px;left:100px;border:solid 1px #ccc;}h2{color:#fff;background: none repeat scroll 0 0 rgba(16, 90, 31, 0.7);color:#FFFFFF;height:40px;line-height:40px;margin:0;}    </style><script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript"></script>    <script type="text/javascript">        $(function(){            /*--------------拖曳效果----------------            *原理：标记拖曳状态dragging ,坐标位置iX, iY            *         mousedown:fn(){dragging = true, 记录起始坐标位置，设置鼠标捕获}            *         mouseover:fn(){判断如果dragging = true, 则当前坐标位置 - 记录起始坐标位置，绝对定位的元素获得差值}            *         mouseup:fn(){dragging = false, 释放鼠标捕获，防止冒泡}            */            var dragging = false;            var iX, iY;            $("#drag").mousedown(function(e) {                dragging = true;                iX = e.clientX - this.offsetLeft;                iY = e.clientY - this.offsetTop;                this.setCapture && this.setCapture();                return false;            });            document.onmousemove = function(e) {                if (dragging) {                var e = e || window.event;                var oX = e.clientX - iX;                var oY = e.clientY - iY;                $("#drag").css({"left":oX + "px", "top":oY + "px"});                return false;                }            };            $(document).mouseup(function(e) {                dragging = false;                $("#drag")[0].releaseCapture();                e.cancelBubble = true;            })        })    </script></head><body>    <div id="drag">    <h2>来拖动我啊</h2>    </div></body></html>