问从ajax获取数据后无法重定向url

EN

<div id="loginContainer">
   <form id="loginFrm" method="post">
      <h3>Members Login Area</h3>
      <img id="divider" src="images/divider.png">
      <input type="email" name="lemail" required placeholder="Enter a valid email address">
      <input name="lpassword" placeholder="Password" type="password" required>
      <input type="submit" value="Sign In">
      <input id="submit" type="hidden" name="submit">
      <p><a href="#">Forgot Password ?</a></p>
      <p id="bottom">Don't have account? <a href="#" id="signup">Sign up here</a></p>
   </form>
</div>
<script>
   $(document).ready(function () {
       $("#loginFrm").submit(function () {
           var data = $("#loginFrm").serialize();
           insertRecords(data);
           return false;
       });
       function insertRecords(data) {
           $.ajax({
               url: 'loginProcess.php',
               data: data,
               type: 'POST',
               dataType: 'html',
               success: function (data) {
                   $("#result").html(data);
                   },
                   error: function () {
                       alert('Error : COde not work properly');
                   }
               });
           }
       });
</script>

<?php
ob_start();
error_reporting(E_ALL);
print_r($_POST);// see all result in network console
require_once('inc/dbconnection.php');
require_once('inc/functions.php');
$emailErr = $password="";
if (isset($_POST['submit'])) {

if (empty($_POST["lemail"])) {
    $emailErr = 'Please enter your email address.';
} else {
    $email = filterEmail($_POST["lemail"]);
    if ($email == FALSE) {
        $emailErr = 'Please enter a valid email address.';
    }
}
if (empty($_POST["lpassword"])) {
    $passwordErr = 'Please enter your password here.';
} else {
    $password = sha1($_POST['lpassword']);
}
}
// after pressing login, checking if the variables exist in the database
if (empty($emailErr) && empty($passwordErr)) {
    $query = $db->prepare("SELECT password FROM users WHERE email=?");
    $query->execute(array($email));
    if ($query->fetchColumn() === $password) {
        // starts the session created if login info is correct
        session_start();
        $_SESSION['email'] = $email;
        header("Location: dashboard.php",true, 302);
        exit;
    } else {
        header("Location: restrict.php",true, 302);
        exit;
    }
} else {
    header("Location: index.php?Email=$emailErr&Password=$passwordErr",true, 302);
    die;
}
ob_end_flush();
?>