<script language="javascript">

    $(".login").live('click',function(){

        var username=$(".input_user").val();

        var password=$(".input_ps").val();

        if(username==""){

            alert("用户名不能为空");

            return false;

        }

        if(password==""){

            alert("密码不能为空");

            return false;

        }

        var URL="checkLogin.php?";

        var DATA="&username="+username+"&password="+password;

        $.getJSON(URL+DATA,function(json){

            if(json.username=='true_u'&&json.password=='true_p'){

                //alert(json.username+"|"+username+'...1');

                window.location="index.php";

            }

            if(json.username=='error_u'||json.password=='error_p'){

                alert("用户名输入或密码输入有误，请检查后重新登陆!");

                window.location="login.php";

            }

        });

    });

</script>

    include_once('connect.php');

    $username=$_GET['username'];

    $password=MD5($_GET['password']);

    //echo $username.'###'.$password;

    $sql="select * from admin";

    $result=mysql_query($sql);

    if(!$result){

        mysql_close();

        echo "登陆失败，请输入正确的用户名和密码！";

    }else{

        while($row=mysql_fetch_array($result)){

            if($row['username']==$username&&$row['password']==$password){

                session_start();

                $_SESSION['username']=$row['username'];

                $adminInfo['username']='true_u';

                $adminInfo['password']='true_p';

                mysql_close();

            }else

            if($row['username']!=$username){

                $adminInfo['username']='error_u';

            }

            if($row['password']!=$password){

                $adminInfo['password']='error_p';

            }

            //var_dump($adminInfo);exit;

            echo json_encode($adminInfo);

        }

    }

?>