private function _createDefaultChannel($accountId)
 {
     $defaultChannel = ArticleChannel::getDefault($accountId);
     if (empty($defaultChannel)) {
         $channel = new ArticleChannel();
         $channel->name = '默认频道';
         $channel->fields = [];
         $channel->isDefault = true;
         $channel->accountId = $accountId;
         if (!$channel->save()) {
             echo $channel->getErrors() . PHP_EOL;
             exit;
         }
     } else {
         echo $accountId . 'data is exists' . PHP_EOL;
     }
 }