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代码短小的jsdiv层拖动实现代码[兼容IE与Firefox]_javascript技巧

<script type="text/javascript"> 
var ie=document.all; 
var nn6=document.getElementById&&!document.all; 
var isdrag=false; 
var x,y; 
var dobj; 
function movemouse(e) 
{ 
if (isdrag) 
{ 
dobj.style.left = nn6 ? tx + e.clientX - x : tx + event.clientX - x; 
dobj.style.top = nn6 ? ty + e.clientY - y : ty + event.clientY - y; 
return false; 
} 
} 
function selectmouse(e) 
{ 
var fobj = nn6 ? e.target : event.srcElement; 
var topelement = nn6 ? "HTML" : "BODY"; 
while (fobj.tagName != topelement && fobj.className != "dragme") 
{ 
fobj = nn6 ? fobj.parentNode : fobj.parentElement; 
} 
if (fobj.className=="dragme") 
{ 
isdrag = true; 
dobj = fobj; 
tx = parseInt(dobj.style.left+0); 
ty = parseInt(dobj.style.top+0); 
x = nn6 ? e.clientX : event.clientX; 
y = nn6 ? e.clientY : event.clientY; 
document.onmousemove=movemouse; 
return false; 
} 
} 
document.onmousedown=selectmouse; 
document.onmouseup=new Function("isdrag=false"); 
</ script> 
<div align="center"> 
<img src="http://www.gxlcms.com/images/logo.gif" style="position:relative;" width="210" height="96" class="dragme"> 
</div>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]