DOM中的问题，为什么新建的<div>层的坐标不是鼠标的位置，求高手解释
<head>
<title></title>
<script type="text/javascript">
function initEvent() {
var as = document.getElementsByTagName("a");
for (var i = 0; i < as.length; i++) {
var a = as[i];
a.onmouseover = aMouseOver;
}
}
function aMouseOver() {
//动态创建一个层；
var div = document.createElement("div");
div.style.position ="absolute";
div.style.top = window.event.clientY;
div.style.left = window.event.clientX;
div.innerHTML = "测试";
document.body.appendChild(div);//放到body中
}
</script>
</head>
<body onload="initEvent()">
<a href="http://www.baidu.com" >百度</a><br /><br />
<a href="http://www.baidu.com" >百度</a><br /><br />
<a href="http://www.baidu.com" >百度</a><br /><br />
</body>
为什么新建的<div>层的坐标不是鼠标的位置，求高手解释div.style.top = window.event.clientY;
div.style.left = window.event.clientX;
[解决办法]
Sets or retrieves the x-coordinate of the mouse pointer's position relative to the client area of the window, excluding window decorations and scroll bars.
用screenX，screenY试试看吧
