function index(){
//session库在构造函数里加载过了
$user = $this->session->userdata('user_session');
$s_id = $this->session->userdata('session_id');
$ip = $this->session->userdata('ip_address');
$data['user'] = $user;
$data['s_id'] = $s_id;
$data['ip'] = $ip;
$this->load->view('operation_view',$data);