laravel框架中间件 except 和 only 的用法示例

class UserController extends Controller
{
  public function __construct()
  {
    $this->middleware('auth', ['except' => 'show']);
   }
  public function show(User $user)
  {
    return view('users.show', pact('user'));
  }
 public function edit(User $user)
  {
     return view('users.edit', pact('user'));
  }
}

class UserController extends Controller
{
  public function __construct()
  {
    $this->middleware('auth', ['only' => 'edit']);
   }
  public function show(User $user)
  {
    return view('users.show', pact('user'));
  }
 public function edit(User $user)
  {
     return view('users.edit', pact('user'));
  }
}