tp6/app/admin/route/app.php

<?php
use think\facade\Route;
Route::get('',function (){
    return 'error url';
});

Route::get('hello', 'Index/index');

Route::get('core', 'Core/xs');

Route::get('cars', 'Index/carRes');

//Route::group('xx', function (){
//    Route::get('hello', 'index/index');
//});