php导出excel表格 打不开 phpspreadsheet 导出的EXCEL 文件打不开

PHP 版本7.1.3我输入 网址http://localhost/fast/vendor/phpoffice/phpspreadsheet/samples/Basic/01_Simple_download_xlsx.php

我写再controller 里面导出的文件无法访问<?php

namespace app\admin\controller\customer;

use app\common\controller\Backend;

use think\Db;

use think\Session;

use think\Config;

use PhpOffice\PhpSpreadsheet\IOFactory;

use PhpOffice\PhpSpreadsheet\Spreadsheet;

/**

* 我的全部客户

*

* @icon fa fa-circle-o

*/

class Customer extends Backend

{

/**

* Customer模型对象

*/

protected $model = null;

protected $searchFields = f_user_name,f_user_tel,f_community,f_address,f_submit_user;

protected $childrenAdminIds =