<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>reg</title>
</head>
<body>
<script type="text/jscript">
function move(event) {
document.getElementById("no1").style.left = event.clientX;
document.getElementById("no1").style.top = event.clientY;
}
document.onmouseup = function () {
document.onmousemove = null;
}
</script>
<style>
#no1 {
border: 4px;
border-color: #F00;
position: absolute;
height: 165px;
width: 270px;
border-style: solid;
left: 68px;
top: 197px;
}
</style>
<div id="no1" onmousedown="document.onmousemove=move"></div>
</body>
</html>
原文：http://www.cnblogs.com/wangtiantian/p/5045593.html