public function indexAction()
 {
     $sessionId = TZ_Request::checkSessionId();
     $password = TZ_Request::checkPassword();
     $oldPassword = TZ_Request::checkOldPassword();
     $changeStatus = TZ_Loader::service('User', 'User')->changePassword($sessionId, $oldPassword, $password);
     if (!$changeStatus) {
         throw new Exception('修改密码失败。');
     }
     TZ_Request::success();
 }