Javascript 实现 div 的拖动

<html>

<head>

<script type="text/javascript">

var x;

var y;

function $(id)

{  

        return document.getElementById(id)  

} 

function mousedown()

{

x=event.clientX-$("px").style.pixelLeft;

y=event.clientY-$("px").style.pixelTop;

$("px").style.border="2px solid red";

$("px").onmousemove = mousemove;

}

function mouseup()

{

$("px").onmousemove = "";

$("px").style.border="";

}

function mousemove()

{

$("px").style.pixelLeft=event.clientX-x;

$("px").style.pixelTop=event.clientY-y;

}

 

</script>

</head>

<body>

<div id="px" style="position:absolute; left:100px; height:100px; width:100px; background-color:#FF0;"

onmousedown="mousedown()" onmouseup="mouseup()" >

</div>

</body>

</html>

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