js+html+css实现鼠标移动div实例

js：

var posX; 
var posY; 
fdiv = document.getElementById("divBody"); 
document.getElementById("divHead").onmousedown=function(e) 
{ 
if(!e) e = window.event; //IE 
posX = e.clientX - parseInt(fdiv.style.left); 
posY = e.clientY - parseInt(fdiv.style.top); 
document.onmousemove = mousemove; 
} 
document.onmouseup = function() 
{ 
document.onmousemove = null; 
} 
function mousemove(ev) 
{ 
if(ev==null) ev = window.event;//IE 
fdiv.style.left = (ev.clientX - posX) + "px"; 
fdiv.style.top = (ev.clientY - posY) + "px"; 
}

html：

<div class="divBody" id="divBody" style="left: 29px; top: 14px;"> <!--这里要加style="left: 29px; top: 14px;" 否则有问题--> 
<div class="divHead" id="divHead" style="cursor: move;"> 
</div> 
<div class="content"> 
</div> 
<div class="tail"> 
</div> 
</div>

css:

.divBody{ 
//margin-top:20px; 
border: solid #CCC 1px; 
width:500px; 
height:400px; 
position:relative; 
z-index:0; 
margin-left:auto; 
margin-right:auto; 
} 
.divHead{ 
width:500px; 
height:50px; 
background-color:#CCC; 
} 
.content 
{ 
width:500px; 
height:300px; 
} 
.tail{ 
background:#CCC; 
height:50px; 
width:500px; 
display:table-cell; 
vertical-align:middle; 
}