<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>自由拖动的DIV层方块</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<style type="text/css">
#draggable{
background-color:green;
font-size:9pt;
padding:30px;
color:white;
width:360px;
height:224px;
position:absolute;
}
</style>
<script type="text/javascript">
var rDrag = {
o:null,
init:function(o){
o.onmousedown = this.start;
},
start:function(e){
var o;
e = rDrag.fixEvent(e);
e.preventDefault && e.preventDefault();
rDrag.o = o = this;
o.x = e.clientX - rDrag.o.offsetLeft;
o.y = e.clientY - rDrag.o.offsetTop;
document.onmousemove = rDrag.move;
document.onmouseup = rDrag.end;
},
move:function(e){
e = rDrag.fixEvent(e);
var oLeft,oTop;
oLeft = e.clientX - rDrag.o.x;
oTop = e.clientY - rDrag.o.y;
rDrag.o.style.left = oLeft + 'px';
rDrag.o.style.top = oTop + 'px';
},
end:function(e){
e = rDrag.fixEvent(e);
rDrag.o = document.onmousemove = document.onmouseup = null;
},
fixEvent: function(e){
if (!e) {
e = window.event;
e.target = e.srcElement;
e.layerX = e.offsetX;
e.layerY = e.offsetY;
}
return e;
}
}
window.onload = function(){
var obj = document.getElementById('draggable');
rDrag.init(obj);
}
</script>
</head>
<body>
<div id="draggable">这个可以拖动！</a></div>
</body>
</html>
