var drag = function(){
var obj = document.getElementById("id");
var s = obj.style;
var b = document.body;
var x = event.clientX + b.scrollLeft - s.pixelLeft;
var y = event.clientY + b.scrollTop - s.pixelTop;
var m = function(){
if(event.button == 1){
s.pixelLeft = event.clientX + b.scrollLeft - x;
s.pixelTop = event.clientY + b.scrollTop - y;
}else {
document.detachEvent("onmousemove", m);
}
};
document.attachEvent("onmousemove", m);
if(!this.z)
this.z = 999;
s.zIndex = ++this.z;
event.cancelBubble = true;
};
然后在div中
<div onmousedown='subway.encapsulate.drag();return false;'/>
另外，DIV中有自己的拖动事件ondrag()，但是下面的函数还有点问题是拖动时有重影。
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
</head>
<style type="text/css">
#myDiv{
background-color:#01ff32;
height:200px;
200px;
top:100px;
left:300px;
position:absolute;
}
h1{
font-size:40px;
}
font{
color:red;
}
</style>
<script>
function drag(event){
document.getElementById('myDiv').style.top = event.clientY;
document.getElementById('myDiv').style.left = event.clientX;
document.getElementById('myDiv').style.cursor='default'
//event.cancelBubble = true;
document.getElementById('myDiv')
}
function changeCousor(){
}
</script>
<body>
<div id="myDiv" ondrag ="drag(event);" onmousedown = "this.draggable = true; " onmouseover="this.style.cursor='hand'">
<center>
<h1><font>drag me</font></h1>
</center>
</div>
</body>
</html>
红色部分标记出来的部分比较重要。再有就是问题出现的原因应该是坐标的计算有点问题。目前的几个坐标还没有考虑清楚，后面会详细介绍几种坐标！