比较精简的Javascript拖动效果函数代码

<html><head><title>拖动效果函数演示 by Longbill.cn</title><style>body {font-size:12px;color:#333333;border : 0px solid blue;}div{position : absolute;background-color : #c3d9ff;margin : 0px;padding : 5px;border : 0px;width : 100px;height:100px;}</style></head><body><script>function drag（o,s）{if （typeof o == "string"） o = document.getElementById（o）;o.orig_x = parseInt（o.style.left） - document.body.scrollLeft;o.orig_y = parseInt（o.style.top） - document.body.scrollTop;o.orig_index = o.style.zIndex;o.onmousedown = function（a）{this.style.cursor = "move";this.style.zIndex = 10000;var d=document;if（！a）a=window.event;var x = a.clientX+d.body.scrollLeft-o.offsetLeft;var y = a.clientY+d.body.scrollTop-o.offsetTop;//author: www.longbill.cnd.ondragstart = "return false;"d.onselectstart = "return false;"d.onselect = "document.selection.empty（）;"if（o.setCapture）o.setCapture（）;else if（window.captureEvents）window.captureEvents（Event.MOUSEMOVE|Event.MOUSEUP）;d.onmousemove = function（a）{if（！a）a=window.event;o.style.left = a.clientX+document.body.scrollLeft-x;o.style.top = a.clientY+document.body.scrollTop-y;o.orig_x = parseInt（o.style.left） - document.body.scrollLeft;o.orig_y = parseInt（o.style.top） - document.body.scrollTop;}d.onmouseup = function（）{if（o.releaseCapture）o.releaseCapture（）;else if（window.captureEvents）window.captureEvents（Event.MOUSEMOVE|Event.MOUSEUP）;d.onmousemove = null;d.onmouseup = null;d.ondragstart = null;d.onselectstart = null;d.onselect = null;o.style.cursor = "normal";o.style.zIndex = o.orig_index;}}if （s）{var orig_scroll = window.onscroll？window.onscroll:function （）{};window.onscroll = function （）{orig_scroll（）;o.style.left = o.orig_x + document.body.scrollLeft;o.style.top = o.orig_y + document.body.scrollTop;}}}</script>div1:我可以被拖动div2:来拖我呀div3:我随便你拖div4:我可以随窗口滑动，把我拖到最下面，然后滚动网页看看作者: Longbillwww.longbill.cn参数说明:drag（obj [,scroll]）;obj:对象的id或对象本身;scroll（可选）:对象是否随窗口拖动而滑动，默认为否鼠标右键查看源代码<script>drag（"div1"）;drag（"div2"）;drag（"div3"）;drag（"div4",1）;drag（"div5",1）;drag（"div6",1）;</script></body>
[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]