laravel 构造函数无法return

在用laravel写对外接口时发现laravel构造函数中是无法return,如果要使用return的话就需要用中间键了
流程：
1.创建中间件,创建成功后在/app/Http/Middlewar下会生成ApiCheck.php文件

php artisan make:middleware ApiCheck

2.在/app/Http/kernel.php注册中间件 ,因为我的是对外接口的中间键，所以在api中添加ApiCheck，如下

    protected $middlewareGroups = [
        'web' => [
            \App\Http\Middleware\EncryptCookies::class,
            \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
            \Illuminate\Session\Middleware\StartSession::class,
            // \Illuminate\Session\Middleware\AuthenticateSession::class,
            \Illuminate\View\Middleware\ShareErrorsFromSession::class,
            \App\Http\Middleware\VerifyCsrfToken::class,
            \Illuminate\Routing\Middleware\SubstituteBindings::class,
        ],

        'api' => [
            'throttle:60,1',
            'bindings',
            \App\Http\Middleware\ApiCheck::class,
        ],
    ];

3.ApiCheck中间键中就可以修改代码，添加return的相关操作了，如下，判断config参数是否存在

<?php

namespace App\Http\Middleware;

use Closure;

class ApiCheck
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        if(!$request["config"]) return response()->json(["errorCode"=>1,"data"=> ["msg"=>"config is invild"]]);
        return $next($request);
    }
}

4.接口测试访问

test.png