<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>

<?php
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);
        }
    }
?>