technician/public/plugins/demo/controller/ApiIndexController.php

<?php
// +----------------------------------------------------------------------
// | ThinkCMF [ WE CAN DO IT MORE SIMPLE ]
// +----------------------------------------------------------------------
// | Copyright (c) 2013-2018 http://www.thinkcmf.com All rights reserved.
// +----------------------------------------------------------------------
// | Author: Dean <zxxjjforever@163.com>
// +----------------------------------------------------------------------

namespace plugins\demo\controller;

//Demo插件英文名，改成你的插件英文就行了
use cmf\controller\PluginRestBaseController;

class ApiIndexController extends PluginRestBaseController
{
    public function index()
    {
        $this->success('success', ['hello' => 'hello ThinkCMF!']);
    }
}