14.6 Dart 导入Pub包管理系统中的库

pub包管理系统:

• 1、从下面网址找到要用的库

https://pub.dev/packages
https://pub.flutter-io.cn/packages
https://pub.dartlang.org/flutter/

• 2、创建一个pubspec.yaml文件，内容如下

    name: xxx
    description: A new flutter module project.
    dependencies:  
        http: ^0.12.0+2
        date_format: ^1.0.6

• 3、配置dependencies
• 4、运行pub get 获取远程库
• 5、看文档引入库使用

import 'dart:convert' as convert;
import 'package:http/http.dart' as http;
import 'package:date_format/date_format.dart';

main() async {
  // var url = "http://www.phonegap100.com/appapi.php?a=getPortalList&catid=20&page=1";

  //   // Await the http get response, then decode the json-formatted responce.
  //   var response = await http.get(url);
  //   if (response.statusCode == 200) {
  //     var jsonResponse = convert.jsonDecode(response.body);
     
  //     print(jsonResponse);
  //   } else {
  //     print("Request failed with status: ${response.statusCode}.");
  //   }

    print(formatDate(DateTime(1989, 2, 21), [yyyy, '*', mm, '*', dd]));
}