public function checkLogin() {         if (Yii::app()->authority->isLogin() == Yii::app()->authority->getStatus('NOTLOGIN')) {             $url = $this->createUrl('user/login');             if (Yii::app()->request->isPostRequest && Yii::app()->request->isAjaxRequest) {                 echo json_encode(array('code' => -101, 'message' => '用户未登录。', 'callback' => 'window.location="' . $url . '";'));             } else if (Yii::app()->request->isAjaxRequest) {                 echo '<script language="javascript">window.location="' . $url . '";</script>';             } else {                 $this->redirect($url);             }             exit;         }         return true;     }

<?php /**  * 权限检查组件  */ class Authority extends CComponent {     private $NOTLOGIN = -1;     private $FAILED = -2;     private $PASS = 1;     public function init() {     }     /**      * 检查是否登陆      * @return boolean       */     function isLogin() {         return isset(Yii::app()->session['user']) ? $this->PASS : $this->NOTLOGIN;     }        /**      * 获取状态值      * @param string $name      * @return int       */     public function getStatus($name){         return $this->$name;     } }