/**
  * 添加评论
  * post: blog_id, content
  */
 public function postComment()
 {
     if (!$this->hasLoginCheck()) {
         return;
     }
     $blog_id = $_POST['blog_id'];
     $content = $_POST['content'];
     $user_id = session('user_id');
     $commentModel = new CommentModel();
     $commentModel->addComment($blog_id, $content);
     $userModel = M('user');
     $comment_user = $userModel->find($user_id);
     $comment = array('user_name' => $comment_user['name'], 'user_id' => $comment_user['id'], 'user_homepage' => $this->conf['APP_ROOT'] . 'Home/userblog/user_id/' . $comment_user['id'], 'user_head_picpath' => $comment_user['head_pic_path'], 'user_comment' => $content);
     $li_html = $this->tpl->getSingleCommentLi($comment, $commentModel->getSomeBlogCommentCount($blog_id));
     echo json_encode(array('status' => 'true', 'li_html' => $li_html));
 }