代码如下：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>可拖拽特效</title> <style type="text/css"> *{margin: 0;padding: 0;} .header{width:100%;height:30px;background:#036663;line-height:30px;color:#fff;text-indent:30px;} #demo{width:400px;height:300px;border:solid 5px #eee;box-shadow:0 0 5px #666;position:absolute;top:40%;left:40%;} #innerht{height:25px;background:#036663;border-bottom:solid 1px #369;color:#fff;text-indent:10px;cursor:move;} #close{float:right;cursor:pointer;} </style> </head> <body> <div>注册信息</div> <div> <div>注册信息（可拖拽）<span>【关闭】</span></div> <div></div> </div> </body> <script type="text/javascript"> (function(window){ function $(id){ return document.getElementById(id); }; // 获取对象 var innerht = $("innerht"),demo = $("demo"),close = $("close"); // 给innerht绑定鼠标事件 innerht.onmousedown = function(event){ // 解决event兼容问题 var event = event || window.event; // 获取鼠标在页面上坐标 var pageX = event.pageX || event.clientX + document.documentElement.scrollLeft; var pageY = event.pageY || event.clientY + document.documentElement.scrollTop; // 获取鼠标在innerht内部的坐标 var innerX = pageX - demo.offsetLeft; var innerY = pageY - demo.offsetTop; // 给document绑定鼠标移动事件，防止鼠标快速滑动时滑出innerht document.onmousemove = function(event){ var event = event || window.event; // 获取鼠标移动时的坐标 var moveX = event.pageX || event.clientX + document.documentElement.scrollLeft; var moveY = event.pageY || event.clientY + document.documentElement.scrollTop; // 鼠标移动时demo的位置坐标 var demoX = moveX - innerX ; var demoY = moveY - innerY ; // 鼠标移动时demo的位置坐标 demo.style.left = demoX + "px"; demo.style.top = demoY + "px"; //清除选中文字 window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty(); } }; // 鼠标抬起清除拖拽效果 document.onmouseup = function(){ document.onmousemove = null ; }; // 点击关闭按钮关闭跟随框 close.onclick = function(){ this.parentNode.parentNode.style.display = "none"; }; })(window) </script> </html>