lw_test/app/mobile/controller/Download.php

<?php

namespace app\mobile\controller;

use app\mobile\MobileBaseController;

class Download extends MobileBaseController
{
    public function index()
    {
        return view();
    }

    public function down()
    {
        $file_url = input('file_url', '');
        $file_path = public_path('static/mobile/download').$file_url;
        if (!file_exists($file_path)) {
            jump('文件不存在或已过期！');
        }
        return download($file_path,$file_url);
    }
}