当用户输入 pwd 密码是 123 就跳到第二个页面，4秒后，自动跳转到第三个页面
login.html
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<script type="text/javascript">
//进行检查
function check(){
//window.alert($("username").value);
if($("username").value=="pwd" && $("pwd").value=="123"){
return true;
}else{
$("username").value="";
$("pwd").value="";
return false;
}
}
//获取文档对象
function $(id){
return document.getElementById(id);
}
</script>
</head>
<body>
<form action="ok.html">
u:<input type="text" id="username" /><br/>
p:<input type="password" id="pwd" /><br/>
<input type="submit" value="提交" onclick="return check()"/>
</form>
</body>
</html>
ok.html
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<script type="text/javascript">
//跳转到指定页面
function tiao(){
clearInterval(myInterval);
window.open("success.html","_self");
}
//设置5秒跳转
setTimeout("tiao()",5000);
//改变秒数
function changeSec(){
//改变数字
$("myspan").innerText=parseInt($("myspan").innerText)-1;
}
var myInterval=setInterval("changeSec()",1000);
//获取对象
function $(id){
return document.getElementById(id);
}
</script>
</head>
<body>
登录成功<span id="myspan">5</span>秒后自动跳转
</body>
</html>
success.html
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<script type="text/javascript">
</script>
</head>
<body>
欢迎.......
</body>
</html>