public function member_edit(Request $request, Response $response)
 {
     $uid = arg(1);
     $member = Member_Model::getMemberById($uid);
     if (empty($member)) {
         $msg = '用户不存在';
         $response->send($msg);
     }
     $v = new PageView('mod_member_info');
     $v->assign('nav', $this->_nav)->assign('nav_second', 'member');
     $v->assign('member', $member);
     $response->send($v);
 }