页面定时自动跳转
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<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
function countdown(secs){
jump.innerHTML=secs;
if(--secs>0){
setTimeout("countdown("+secs+")" ,1000);//过1000ms做什么——递归调用本身，秒数-1
}else{
location.href="MainServlet?type=jump";//当上面的if后表达式为假时，页面将定为到首页 success.jsp
}
}
</script>
</head>
<body onload="countdown(5)">
页面将在<span id="jump"></span>秒后自动跳转到主页面
</body>
</html>
