无限位置拖动DIV，随你怎么拖动（代码）
样例代码：
把这个代码保存成deom.html执行一下看，你会发现，每一个层都可以被无限拖动的
哈哈是不是很开心～～～
复制内容到剪贴板
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;
oo.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.cn
d.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";
oo.style.zIndex = o.orig_index;
}
}
if (s)
{
var orig_scroll = window.onscroll?window.onscroll:function (){};
window.onscroll = function ()
{
orig_scroll();
oo.style.left = o.orig_x + document.body.scrollLeft;
oo.style.top = o.orig_y + document.body.scrollTop;
}
}
}
</script>
<div id="div1" style="left:10px;top:10px;">div1:拖吧，往死里拖</div>
<div id="div2" style="left:120px;top:10px;background-color : #f3d9ff">div2:来拖我呀</div>
<div id="div3" style="left:230px;top:10px;background-color : #c3ffff">div3:随你怎么拖</div>
<div id="div4" style="left:10px;top:120px;background-color : #c3d944">div4:我可以随窗口滑动，把我拖到最下面，然后滚动网页看看</div>
<div id="div5" style="left:120px;top:120px;background-color : #f3d944">php同盟会<br/><a href=http://www.dophp.net target=_blank>www.dophp.net</a>
</div>
<div id="div6" style="left:230px;top:120px;background-color : #e3f944;width:200px;">参数说明:<br/>
drag(obj [,scroll]);<br/>
obj:对象的id或对象本身;<br/>
scroll(可选):对象是否随窗口拖动而滑动，默认为否<br/>
鼠标右键查看源代码
</div>
<script>
drag("div1");
drag("div2");
drag("div3");
drag("div4",1);
drag("div5",1);
drag("div6",1);
</script>
</body> 接下来贴一个drag函数的代码 这个可是最关键的哦
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代码:
function drag(o,s) 两个参数 第一个事元素id或者元素本身 第二个是可选参数，0或1，表示层是否随滚动条的滚动一起运动
{
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;
oo.orig_index = o.style.zIndex;
//author: www.longbill.cn
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;
d.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";
oo.style.zIndex = o.orig_index;
}
}
if (s)
{
var orig_scroll = window.onscroll?window.onscroll:function (){};
window.onscroll = function ()
{
orig_scroll();
oo.style.left = o.orig_x + document.body.scrollLeft;
oo.style.top = o.orig_y + document.body.scrollTop;
}
}
} 
