Row(
                            children: [
                              Text(
                                "发布时间",
                                style: TextStyle(
                                    fontSize: 20, color: Colors.black54),
                              ),
                              Expanded(
                                child: Text(''), // 中间用Expanded控件
                              ),
                              Text(
                                DateTime.fromMillisecondsSinceEpoch(
                                        int.parse(_goods.create_time) * 1000)
                                    .toString()
                                    .substring(0, 19),
                                style: TextStyle(
                                    fontSize: 20, color: Colors.black54),
                              ),
                            ],
                          ),