composer require fruitcake/laravel-cors
    php artisan vendor:publish --tag="cors"

生成config/cors配置文件

    <?php    
    return [
        /*
        |--------------------------------------------------------------------------
        | Laravel CORS Options
        |--------------------------------------------------------------------------
        |
        | The allowed_methods and allowed_headers options are case-insensitive.
        |
        | You don't need to provide both allowed_origins and allowed_origins_patterns.
        | If one of the strings passed matches, it is considered a valid origin.
        |
        | If array('*') is provided to allowed_methods, allowed_origins or allowed_headers
        | all methods / origins / headers are allowed.
        |
        */
        /*
         * You can enable CORS for 1 or multiple paths.
         * Example: ['api/*']
         */
        'paths' => ['api/*'],
        /*
        * Matches the request method. `[*]` allows all methods.
        */
        'allowed_methods' => ['*'],
        /*
         * Matches the request origin. `[*]` allows all origins. Wildcards can be used, eg `*.mydomain.com`
         */
        'allowed_origins' => ['*'],
        /*
         * Patterns that can be used with `preg_match` to match the origin.
         */
        'allowed_origins_patterns' => [],
        /*
         * Sets the Access-Control-Allow-Headers response header. `[*]` allows all headers.
         */
        'allowed_headers' => ['*'],
        /*
         * Sets the Access-Control-Expose-Headers response header with these headers.
         */
        'exposed_headers' => [],
        /*
         * Sets the Access-Control-Max-Age response header when > 0.
         */
        'max_age' => 0,
        /*
         * Sets the Access-Control-Allow-Credentials header.
         */
        'supports_credentials' => false,
    ];

在config/app  providers 添加 Fruitcake\Cors\CorsServiceProvider::class,

    <?php    
    return [
        /*
        |--------------------------------------------------------------------------
        | Application Name
        |--------------------------------------------------------------------------
        |
        | This value is the name of your application. This value is used when the
        | framework needs to place the application's name in a notification or
        | any other location as required by the application or its packages.
        |
        */
        'name' => env('APP_NAME', 'Laravel'),
        /*
        |--------------------------------------------------------------------------
        | Application Environment
        |--------------------------------------------------------------------------
        |
        | This value determines the "environment" your application is currently
        | running in. This may determine how you prefer to configure various
        | services the application utilizes. Set this in your ".env" file.
        |
        */
        'env' => env('APP_ENV', 'production'),
        /*
        |--------------------------------------------------------------------------
        | Application Debug Mode
        |--------------------------------------------------------------------------
        |
        | When your application is in debug mode, detailed error messages with
        | stack traces will be shown on every error that occurs within your
        | application. If disabled, a simple generic error page is shown.
        |
        */
        'debug' => env('APP_DEBUG', false),
        /*
        |--------------------------------------------------------------------------
        | Application URL
        |--------------------------------------------------------------------------
        |
        | This URL is used by the console to properly generate URLs when using
        | the Artisan command line tool. You should set this to the root of
        | your application so that it is used when running Artisan tasks.
        |
        */
        'url' => env('APP_URL', 'http://localhost'),
        'asset_url' => env('ASSET_URL', null),
        /*
        |--------------------------------------------------------------------------
        | Application Timezone
        |--------------------------------------------------------------------------
        |
        | Here you may specify the default timezone for your application, which
        | will be used by the PHP date and date-time functions. We have gone
        | ahead and set this to a sensible default for you out of the box.
        |
        */
        'timezone' => 'PRC',
        /*
        |--------------------------------------------------------------------------
        | Application Locale Configuration
        |--------------------------------------------------------------------------
        |
        | The application locale determines the default locale that will be used
        | by the translation service provider. You are free to set this value
        | to any of the locales which will be supported by the application.
        |
        */
        'locale' => 'en',
        /*
        |--------------------------------------------------------------------------
        | Application Fallback Locale
        |--------------------------------------------------------------------------
        |
        | The fallback locale determines the locale to use when the current one
        | is not available. You may change the value to correspond to any of
        | the language folders that are provided through your application.
        |
        */
        'fallback_locale' => 'en',
        /*
        |--------------------------------------------------------------------------
        | Faker Locale
        |--------------------------------------------------------------------------
        |
        | This locale will be used by the Faker PHP library when generating fake
        | data for your database seeds. For example, this will be used to get
        | localized telephone numbers, street address information and more.
        |
        */
        'faker_locale' => 'en_US',
        /*
        |--------------------------------------------------------------------------
        | Encryption Key
        |--------------------------------------------------------------------------
        |
        | This key is used by the Illuminate encrypter service and should be set
        | to a random, 32 character string, otherwise these encrypted strings
        | will not be safe. Please do this before deploying an application!
        |
        */
        'key' => env('APP_KEY'),
        'cipher' => 'AES-256-CBC',
        /*
        |--------------------------------------------------------------------------
        | Autoloaded Service Providers
        |--------------------------------------------------------------------------
        |
        | The service providers listed here will be automatically loaded on the
        | request to your application. Feel free to add your own services to
        | this array to grant expanded functionality to your applications.
        |
        */
        'providers' => [
            /*
             * Laravel Framework Service Providers...
             */
            Illuminate\Auth\AuthServiceProvider::class,
            Illuminate\Broadcasting\BroadcastServiceProvider::class,
            Illuminate\Bus\BusServiceProvider::class,
            Illuminate\Cache\CacheServiceProvider::class,
            Illuminate\Foundation\Providers\ConsoleSupportServiceProvider::class,
            Illuminate\Cookie\CookieServiceProvider::class,
            Illuminate\Database\DatabaseServiceProvider::class,
            Illuminate\Encryption\EncryptionServiceProvider::class,
            Illuminate\Filesystem\FilesystemServiceProvider::class,
            Illuminate\Foundation\Providers\FoundationServiceProvider::class,
            Illuminate\Hashing\HashServiceProvider::class,
            Illuminate\Mail\MailServiceProvider::class,
            Illuminate\Notifications\NotificationServiceProvider::class,
            Illuminate\Pagination\PaginationServiceProvider::class,
            Illuminate\Pipeline\PipelineServiceProvider::class,
            Illuminate\Queue\QueueServiceProvider::class,
            Illuminate\Redis\RedisServiceProvider::class,
            Illuminate\Auth\Passwords\PasswordResetServiceProvider::class,
            Illuminate\Session\SessionServiceProvider::class,
            Illuminate\Translation\TranslationServiceProvider::class,
            Illuminate\Validation\ValidationServiceProvider::class,
            Illuminate\View\ViewServiceProvider::class,
            /*
             * Package Service Providers...
             */
            /*
             * Application Service Providers...
             */
            App\Providers\AppServiceProvider::class,
            App\Providers\AuthServiceProvider::class,
            // App\Providers\BroadcastServiceProvider::class,
            App\Providers\EventServiceProvider::class,
            App\Providers\RouteServiceProvider::class,
            Mews\Captcha\CaptchaServiceProvider::class,
            Maatwebsite\Excel\ExcelServiceProvider::class,
            Fruitcake\Cors\CorsServiceProvider::class,
        ],
        /*
        |--------------------------------------------------------------------------
        | Class Aliases
        |--------------------------------------------------------------------------
        |
        | This array of class aliases will be registered when this application
        | is started. However, feel free to register as many as you wish as
        | the aliases are "lazy" loaded so they don't hinder performance.
        |
        */
        'aliases' => [
            'App' => Illuminate\Support\Facades\App::class,
            'Arr' => Illuminate\Support\Arr::class,
            'Artisan' => Illuminate\Support\Facades\Artisan::class,
            'Auth' => Illuminate\Support\Facades\Auth::class,
            'Blade' => Illuminate\Support\Facades\Blade::class,
            'Broadcast' => Illuminate\Support\Facades\Broadcast::class,
            'Bus' => Illuminate\Support\Facades\Bus::class,
            'Cache' => Illuminate\Support\Facades\Cache::class,
            'Config' => Illuminate\Support\Facades\Config::class,
            'Cookie' => Illuminate\Support\Facades\Cookie::class,
            'Crypt' => Illuminate\Support\Facades\Crypt::class,
            'DB' => Illuminate\Support\Facades\DB::class,
            'Eloquent' => Illuminate\Database\Eloquent\Model::class,
            'Event' => Illuminate\Support\Facades\Event::class,
            'File' => Illuminate\Support\Facades\File::class,
            'Gate' => Illuminate\Support\Facades\Gate::class,
            'Hash' => Illuminate\Support\Facades\Hash::class,
            'Lang' => Illuminate\Support\Facades\Lang::class,
            'Log' => Illuminate\Support\Facades\Log::class,
            'Mail' => Illuminate\Support\Facades\Mail::class,
            'Notification' => Illuminate\Support\Facades\Notification::class,
            'Password' => Illuminate\Support\Facades\Password::class,
            'Queue' => Illuminate\Support\Facades\Queue::class,
            'Redirect' => Illuminate\Support\Facades\Redirect::class,
            'Redis' => Illuminate\Support\Facades\Redis::class,
            'Request' => Illuminate\Support\Facades\Request::class,
            'Response' => Illuminate\Support\Facades\Response::class,
            'Route' => Illuminate\Support\Facades\Route::class,
            'Schema' => Illuminate\Support\Facades\Schema::class,
            'Session' => Illuminate\Support\Facades\Session::class,
            'Storage' => Illuminate\Support\Facades\Storage::class,
            'Str' => Illuminate\Support\Str::class,
            'URL' => Illuminate\Support\Facades\URL::class,
            'Validator' => Illuminate\Support\Facades\Validator::class,
            'View' => Illuminate\Support\Facades\View::class,
            'Captcha' => Mews\Captcha\Facades\Captcha::class,
            'Excel' => Maatwebsite\Excel\Facades\Excel::class,
        ],
         'm_domain' => env('M_APP_DOMAIN', 'm.chemicalseller.cn'),
    ];

在kernel 里middleware添加 \Fruitcake\Cors\HandleCors::class

    <?php    
    namespace App\Http;
    use App\Http\Middleware\OperationLog;
    use Illuminate\Foundation\Http\Kernel as HttpKernel;
    use Illuminate\Support\Facades\App;
    class Kernel extends HttpKernel
    {
        /**
         * The application's global HTTP middleware stack.
         *
         * These middleware are run during every request to your application.
         *
         * @var array
         */
        protected $middleware = [
            \App\Http\Middleware\CheckForMaintenanceMode::class,
            \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
            \App\Http\Middleware\TrimStrings::class,
            \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
            \App\Http\Middleware\TrustProxies::class,
             \Fruitcake\Cors\HandleCors::class,
        ];
        /**
         * The application's route middleware groups.
         *
         * @var array
         */
        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,
                OperationLog::class,
            ],
            'api' => [
                //\Barryvdh\Cors\HandleCors::class,
                'throttle:600,1',
                'bindings',
            ],
        ];
        /**
         * The application's route middleware.
         *
         * These middleware may be assigned to groups or used individually.
         *
         * @var array
         */
        protected $routeMiddleware = [
    //        'auth' => \App\Http\Middleware\Authenticate::class,
            'auth' => \Illuminate\Auth\Middleware\Authenticate::class,
            'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
            'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
            'cache.headers' => \Illuminate\Http\Middleware\SetCacheHeaders::class,
            'can' => \Illuminate\Auth\Middleware\Authorize::class,
            'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
            'signed' => \Illuminate\Routing\Middleware\ValidateSignature::class,
            'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
            'verified' => \Illuminate\Auth\Middleware\EnsureEmailIsVerified::class,
            'permission' => \Spatie\Permission\Middlewares\PermissionMiddleware::class,
            'role'       => \Spatie\Permission\Middlewares\RoleMiddleware::class,
            'isMobile'  => \App\Http\Middleware\isMobile::class,
            'wechat'  => \App\Http\Middleware\Wechat::class,
            // 'cors' => \Fruitcake\Cors\HandleCors::class,
        ];
        /**
         * The priority-sorted list of middleware.
         *
         * This forces non-global middleware to always be in the given order.
         *
         * @var array
         */
        protected $middlewarePriority = [
            \Illuminate\Session\Middleware\StartSession::class,
            \Illuminate\View\Middleware\ShareErrorsFromSession::class,
            \App\Http\Middleware\Authenticate::class,
            \Illuminate\Session\Middleware\AuthenticateSession::class,
            \Illuminate\Routing\Middleware\SubstituteBindings::class,
            \Illuminate\Auth\Middleware\Authorize::class,
        ];
    }

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