js实现拖动，刚学js时写的
太简单了，功能也就不完善。拖动的时候，如果鼠标移动的太快，就乱了。
/htdocs/html/dd.html
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js拖动</title>
<style type="text/css">
#test {
width: 200px;
height: 150px;
border: 1px solid #ccc;
position: absolute;
top: 100px;
left: 100px;
}
#test h5 {
width: 200px;
height: 20px;
margin: 0;
padding: 0;
background: #666;
color: #fff;
cursor: move;
}
</style>
<script type="text/javascript">
var draging = false;
function setPos(a, b){
if(draging){
document.getElementById('test').style.left = a+'px';
document.getElementById('test').style.top = b+'px';
}
}
</script>
</head>
<body>
<div id="test">
<h5 onmousemove="setPos(event.clientX-100, event.clientY-10);" onmousedown="draging = true;" onmouseup="draging = false;">title</h5>
content
</div>
</body>
</html>
