public function closeAction()
 {
     Site::loadSettings();
     $settings = C('SITE');
     if (IS_POST) {
         $close = coll_elements(array('close', 'tips'), I('post.'));
         $settings[Site::OPT_CLOSE] = intval($close['close']);
         $settings[Site::OPT_CLOSETIPS] = $close['tips'];
         Site::saveSettings($settings);
         $this->success('操作成功');
         exit;
     }
     $entity = array();
     $entity['close'] = $settings[Site::OPT_CLOSE];
     $entity['tips'] = $settings[Site::OPT_CLOSETIPS];
     $this->assign('entity', $entity);
     C('FRAME_CURRENT', U('control/site/common'));
     $this->display();
 }