php – Laravel 4 Auth：尝试不工作

$userData = array('email' => 'admin@admin.com','password' => 'admin');
if(Auth::attempt($userData)){
    // redirect
}
else{
   echo 'Invalid';
}

并且每次都返回Invalid

现在我不确定究竟是什么原因.

在我的config / auth.php中,我有以下内容

<?php

   return array(
/*
|--------------------------------------------------------------------------
| Default Authentication Driver
|--------------------------------------------------------------------------
|
| This option controls the authentication driver that will be utilized.
| This drivers manages the retrieval and authentication of the users
| attempting to get access to protected areas of your application.
|
| Supported: "database","eloquent"
|
*/

'driver' => 'eloquent',/*
|--------------------------------------------------------------------------
| Authentication Model
|--------------------------------------------------------------------------
|
| When using the "Eloquent" authentication driver,we need to know which
| Eloquent model should be used to retrieve your users. Of course,it
| is often just the "User" model but you may use whatever you like.
|
*/

'model' => 'User',/*
|--------------------------------------------------------------------------
| Authentication Table
|--------------------------------------------------------------------------
|
| When using the "Database" authentication driver,we need to know which
| table should be used to retrieve your users. We have chosen a basic
| default value but you may easily change it to any table you like.
|
*/

'table' => 'users',/*
|--------------------------------------------------------------------------
| Password Reminder Settings
|--------------------------------------------------------------------------
|
| Here you may set the settings for password reminders,including a view
| that should be used as your password reminder e-mail. You will also
| be able to set the name of the table that holds the reset tokens.
|
*/
'reminder' => array(
    'email' => 'emails.auth.reminder','table' => 'password_reminders',),);
 ?>