public function index()
 {
     $this->display();
     self::$WX = new Wechat(self::$token);
     /* 获取请求信息 */
     $data = self::$WX->request();
     if ($data && is_array($data)) {
         $this->reply($data);
     }
 }
 public function _initialize()
 {
     self::$WX = new Wechat(self::$token);
 }