### 定义中间件 ``` php think make:middleware 中间件的名称 这个指令会 application/http/middleware目录下面生成一个中间件文件 ``` ``` namespace app\http\middleware; class checkLogin { public function handle($request, \Closure $next) { echo "你好 "; return $next($request); } } ``` ``` class Index extends Controller { protected $middleware = [ 'checkLogin' ]; public function index() { return 'hello, tp5.1 '; } } ```