erp_yzx/app/api/controller/Demo.php

<?php

namespace app\api\controller;

use app\BaseController;

class Demo extends BaseController
{
    public function index()
    {
        return $this->ok(["hello" =>'123', "io" => "/"]);
    }

    public function hello($name = 'ThinkPHP6')
    {
        return 'hello,' . $name;
    }
}