网络请求

    // 初始化页面后的下一个生命周期状态
    void didChangeDependencies() async {
      super.didChangeDependencies();
      client = new ApiClient();
      await _getData();
    }
    Future<void> _getData() async {
      Map<String, dynamic> res = null;
      var result = client.getBanben();
      print('== -- == -- == -- == -- == -- == -- ==');
      result.then((value){
        print(value);
        print(value.data['versionShort']);
      });
      print('== -- == -- == -- == -- == -- == -- ==');
    }