限制访问者浏览页面的时间的特效
<html>
<head>
<title>
狡猾的按钮
</title>
<script>
function slip()
{
var x=Math.round(Math.random()*400);
var y=Math.round(Math.random()*400);
document.getElementById("move").style.left=x;
document.getElementById("move").style.top=y;
}
</script>
</head>
<body>
<form name="myform">
你不喜欢我？
<p><div id=move style="position:absolute;"><input type=button value="是" onmouseover="slip()"></div>
<div style="position:relative;left:20pt;"><input type=button value="否"></div>
</form>
</body>
</html>