Php Ajax在登录页面中不起作用

我正在学习Ajax，并试图用php创建一个登录页面。我不明白为什么我的代码不起作用。每当我点击login按钮，我的页面就会重定向到另一个页面（例如exam.php），而不检查我的登录功能。我的代码如下。如果有人帮我找出问题，我会很高兴的

HTML

<form action="" method="post">
 <input name="email" type="text" id="email">
 <input name="password" type="password" id="password">
 <input type="submit" name="login" id="loginsubmit" value="Login">
</form>
   <span class="empty" style="display:none">Field must be empty..</span>
   <span class="error" style="display:none">Email or Password not matched !!!</span>
   <span class="disable" style="display:none">User Id Disabled.</span>

getlogin.php

$filepath = realpath(dirname(__FILE__));
include_once ($filepath.'/classes/user.php');
$usr = new User();

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // this values are coming from main.js
    $email    = $_POST['email'];
    $password = md5($_POST['password']);        
    $userlogin = $usr->userLogin($email, $password ); // function created in user.php page
}

$filepath = realpath(dirname(__FILE__));
include_once ($filepath.'/../lib/Session.php');
include_once ($filepath.'/../lib/Database.php');
include_once ($filepath.'/../helpers/Format.php');

public function userLogin($email, $password ){
    $email      = $this->fm->validation($email);
    $password   = $this->fm->validation($password);
    $email      = mysqli_real_escape_string($this->db->link, $email);
    $password   = mysqli_real_escape_string($this->db->link, $password);

        if ($email == "" || $password == "" )
         {
            echo " empty";
            exit();
        } else {
            $query = "SELECT * FROM tbl_user WHERE email = '$email' AND password = '$password'";
            $result = $this->db->select($query);
            if ($result != false) {
                $value = $result->fetch_assoc();
                if ($value['status'] == '1') {
                    echo " disable";
                    exit();
                } else {
                    Session::init();
                    Session::set("login", true);
                    Session::set("userid", $value['userid']);
                    Session::set("username", $value['username']);
                    Session::set("name", $value['name']);
                }
            } else {
                echo " error";
                exit();
            }
        }
    }

user.php

$filepath = realpath(dirname(__FILE__));
include_once ($filepath.'/classes/user.php');
$usr = new User();

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // this values are coming from main.js
    $email    = $_POST['email'];
    $password = md5($_POST['password']);        
    $userlogin = $usr->userLogin($email, $password ); // function created in user.php page
}

$filepath = realpath(dirname(__FILE__));
include_once ($filepath.'/../lib/Session.php');
include_once ($filepath.'/../lib/Database.php');
include_once ($filepath.'/../helpers/Format.php');

public function userLogin($email, $password ){
    $email      = $this->fm->validation($email);
    $password   = $this->fm->validation($password);
    $email      = mysqli_real_escape_string($this->db->link, $email);
    $password   = mysqli_real_escape_string($this->db->link, $password);

        if ($email == "" || $password == "" )
         {
            echo " empty";
            exit();
        } else {
            $query = "SELECT * FROM tbl_user WHERE email = '$email' AND password = '$password'";
            $result = $this->db->select($query);
            if ($result != false) {
                $value = $result->fetch_assoc();
                if ($value['status'] == '1') {
                    echo " disable";
                    exit();
                } else {
                    Session::init();
                    Session::set("login", true);
                    Session::set("userid", $value['userid']);
                    Session::set("username", $value['username']);
                    Session::set("name", $value['name']);
                }
            } else {
                echo " error";
                exit();
            }
        }
    }

---

我认为问题是因为缺少

User

类定义，所以这个脚本的输出是致命错误，它直接进入ajax调用中的

else

语句

---

在chrome中，您可以使用“网络”选项卡下的开发人员工具检查ajax请求的输出。

将按钮类型从提交更改为按钮。

签出。另请参见用户类定义的位置？$usr=new User（）；在getlogin.php页面中添加了它。$usr=new User（）；在getlogin.php页面中添加了它类本身的定义不应该在user.php中吗？您正在调用类的

userLogin

方法

User

，而不在任何地方定义类。类用户{private$db；private$fm；公共函数uu construct（）{$this->db=new Database（）；$this->fm=new Format（）；}在user.php中添加了它。这里没有提到它。您可以使用chrome开发者工具检查ajax调用的结果吗？