在laravel 5中如何防止注销后的浏览器返回按钮

use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Session;

class LoginController extends Controller
{
    // ...

    public function logout(Request $request)
    {
        Auth::logout();
        Session::flush();

        return redirect('/login');
    }

    // ...
}