public function article($id)
 {
     $model = new ArticleCategoryViewModel();
     $article = $model->where(array('articleId' => $id))->find();
     if (empty($article)) {
         $this->error('文章不存在');
     }
     $isHits = S('article-view-' . $id . '-' . get_client_ip());
     if (!$isHits) {
         $model->where(array('articleId' => $id))->setInc('hits');
         S('article-view-' . $id . '-' . get_client_ip(), 1, 600);
         $article['hits']++;
     }
     //评论
     $commentModel = new Model('Comment');
     $comments = $commentModel->where(array('articleId' => $id))->limit(30)->order('commentId DESC')->select();
     $this->assign('article', $article);
     $this->assign('comments', $comments);
     $this->display();
 }