引入 flutter_pickers: ^2.1.9
import 'package:flutter_pickers/pickers.dart';
import 'package:flutter_pickers/style/default_style.dart';
import 'package:flutter_pickers/style/picker_style.dart';
List<String> _numberList = [
'99','98','97','96','95','94','93','92','91',
'90','89','88','87','86','85','84','83','82','81',
'80','79','78','77','76'

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