js实现完美拖拽效果可拖动层与回放拖动规迹并显示拖动距离参数

<meta http-equiv="content-type" content="text/html; charset=utf-8"> <title>完美拖拽</title> <style type="text/css"> html,body{overflow:hidden;} body,div,h2,p{margin:0;padding:0;} body{color:#fff;background:#000;font:12px/2 arial;} p{padding:0 10px;margin-top:10px;} span{color:#ff0;padding-left:5px;} #box{position:absolute;width:300px;height:150px;background:#333;border:2px solid #ccc;top:50%;left:50%;margin:-75px 0 0 -150px;} #box h2{height:25px;cursor:move;background:#222;border-bottom:2px solid #ccc;text-align:right;padding:0 10px;} #box h2 a{color:#fff;font:12px/25px arial;text-decoration:none;outline:none;} </style> <div id="box"> <h2><a href="/default/index/url?u=aHR0cHM6Ly93d3cuMTBxaWFud2FuLmNvbWphdmFzY3JpcHQ6Ow==" target="_blank" rel="nofollow">点击回放拖动轨迹</a></h2> <p><strong>drag:</strong><span></span></p> <p><strong>offsettop:</strong><span></span></p> <p><strong>offsetleft:</strong><span></span></p> </div>
[ctrl+a 全选 注:引入外部js需再刷新一下页面才能执行]