<!DOCTYPE html>
<html>
<head>
<title>浏览器对象</title>
<meta http-equiv="Content-Type" content="text/html; charset=gkb"/>
</head>
<body>
<!--先编写好网页布局-->
<h1>操作成功</h1>
<h3><span id="con">5</span>
<span>秒后回到主页</span><a href=window.history.back()>返回</a></h3>
<script type="text/javascript">
var num = 5;
function count(){
num--;
document.getElementById("con").innerHTML = num; //获取显示秒数的元素，通过定时器来更改秒数。
if(num==1){
window.location.assign("http://www.imooc.com/");
}
}
setInterval(count,1000);
</script>
</body>
</html>终于跑起来了