public function add($order_id)
 {
     AuthPlugins::required($this, array('销售经理', '销售顾问'));
     $order_id = abs(intval($order_id));
     $content = trim(nl2br(strip_tags($_POST['content'])));
     if (!$order_id || !$this->is_post() || !$content) {
         return false;
     }
     parent::load('model', 'Order.Communication');
     $c = new Communication();
     $c->order_id = $order_id;
     $c->content = $content;
     $c->user_id = User::info('id');
     $c->save();
     echo 'ok';
 }