tp5 session_id 跨域

<?php
namespace appappApicontroller;
header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");
header("Access-Control-Allow-Methods: GET, POST, PUT");
use thinkController;
use thinkRequest;
use thinkSession;
use appadmincontrollerCommPublic;

class Index extends Controller
{

    public function __construct(Request $request)
    {
        parent::__construct($request);

//        关闭session_star
        Session::init([
                "prefix"         => "module",
                "type"           => "",
                "auto_start"     => false,//先关闭session
        ]);

       if (input("sid")) {

	//登录时发送session_id给前端然后再让前端发送过来

           session_id(input("sid"));

       }
          session_start();

	//下面正常使用session("user_id");就可以的到user_id的值了

    }

}