创建中间件：
php artisan make:middleware CrossHttp
在中间件的中添加下列代码：这个是所有域都能访问
public function handle($request, Closure $next)
{
$response = $next($request);
$response->header('Access-Control-Allow-Origin', '*');
$response->header('Access-Control-Allow-Headers', 'Origin, Content-Type, Cookie, Accept');
$response->header('Access-Control-Allow-Methods', 'GET, POST, PATCH, PUT, OPTIONS');
$response->header('Access-Control-Allow-Credentials', 'false');
return $response;
}
指定域名访问：
$response->header('Access-Control-Allow-Origin', 'http://mytest.com');
设置\app\Http\Kernel.php
全局访问：
指定域名访问：
