这个问题只在Chrome和Firefox中出现。Opera和Safari可以正常工作。登录时，我没有选中rememberMe选项。

允许自动登录设置为TRUE

下面是我从LoginForm模型中登录的方法：

public function login()
{
    if ($this->_identity === NULL)
    {
        $this->_identity = new UserIdentity($this->login, $this->password);
        $this->_identity->authenticate();
    }
    if ($this->_identity->errorCode === UserIdentity::ERROR_NONE)
    {
        $duration = $this->rememberMe ? 3600 * 24 * 30 : 0; // 30 days
        Yii::app()->user->login($this->_identity, $duration);
        return TRUE;
    }
    else
        return FALSE;
}

下面是我的行动：

public function actionLogin()
{
    $model = new LoginForm;

    // if it is ajax validation request
    if (isset($_POST['ajax']) && $_POST['ajax'] === 'login-form')
    {
        echo CActiveForm::validate($model);
        Yii::app()->end();
    }

    // collect user input data
    if (isset($_POST['LoginForm']))
    {
        $model->attributes = $_POST['LoginForm'];
        // validate user input and redirect to the previous page if valid
        if ($model->validate() && $model->login()) $this->redirect(Yii::app()->user->returnUrl);
    }
    // display the login form
    $this->render('login', array('model' => $model));
}