public function actionComment()
 {
     $comment = new Comment();
     if (isset($_POST['Comment'])) {
         $comment->shareId = $_POST['Comment']['shareId'];
         $comment->createTime = time();
         $comment->replyId = $_POST['Comment']['replyId'];
         $comment->content = $_POST['Comment']['content'];
         $comment->userId = Yii::app()->user->userId;
         $clientFlash = new ClientFlash();
         if ($comment->validate() && $comment->save()) {
             $clientFlash->setFlash(0, 'comment', '评论成功');
         } else {
             $clientFlash->setFlash(1, 'comment', '评论失败');
         }
     }
     $this->render('comment', array('commentForm' => $comment));
 }