先来看运行效果截图如下：
在线演示地址如下：
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>自写的拖动类……</title> <script type="text/javascript"> var d=document;//给document对象一个通用的事件侦听方法 d.addListener=function(e,f,b){ this.attachEvent?this.attachEvent('on'+e,f):this.addEventListener(e,f,b); } d.removeListener=function(e,f,b){ this.detachEvent?this.detachEvent('on'+e,f):this.removeEventListener(e,f,b); } function $(){//接收一个id参数，返回带有startDrag方法的对象 var o=document.getElementById(arguments[0]); o.addListener=function(e,f,b){ this.attachEvent?this.attachEvent('on'+e,f):this.addEventListener(e,f,b); } o.removeListener=function(e,f,b){ this.detachEvent?this.detachEvent('on'+e,f):this.removeEventListener(e,f,b); } o.startDrag=function(obj){//参数obj默认为o本身，可以传其它参数以确定要移动的对象 var obj=obj?obj:o; var sx,sy; o.style.cursor="move"; o.addListener("mousedown",function(e){ e||event; if(e.button==1||e.button==0){ sx=e.clientX-obj.offsetLeft;sy=e.clientY-obj.offsetTop; d.addListener("mousemove",move,false); d.addListener("mouseup",stopDrag,false); } },false); var stopDrag=function(){ d.removeListener("mousemove",move,false); d.removeListener("mouseup",stopDrag,false); } var move=function(e){ e||event; window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty(); if(e.preventDefault)e.preventDefault();//这两句便是解决firefox拖动问题的. with (obj.style){ position="absolute" left=e.clientX-sx+"px"; top=e.clientY-sy+"px"; } } } return o; } window.onload=function(){$("ok").startDrag($("os"))}//本例中拖动ok元素，移动其父元素 </script> <style type="text/css"> *{margin:0;padding:0} #ok{width:215px;height:170px;background:url(images/sample1.gif)} #os{width:400px;height:300px;background:#09f;left:300px} #os2{width:400px;height:300px;background:#f90;} </style> </head> <body> <div><p></p></div> <div></div> </body> </html>