watercat_website/public/plugins/demo/controller/IndexController.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 app\user\model\UserModel;
use cmf\controller\PluginBaseController;

class IndexController extends PluginBaseController
{
    public function index()
    {
        $users = UserModel::limit(0, 5)->select();
        $this->assign('users', $users);

        return $this->fetch('/index');
    }
}