php_ajax实现登录

Login
User Name:
Password:

//login.php

header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");//不使用缓存
header("Content-Type:text/html;charset=gb2312");//使用gb2312编码，为返回中文值设定
$username=$_GET["username"];
$password=$_GET["password"];
if($username=="admin" && $password=="admin"){echo "yes";}else{echo "No";}

?>