jquery简单的拖动效果

<!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>


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