Dart 异步

本文介绍Dart的异步的处理方法，并且介绍了语法糖的使用方法。

异步回调then

• import 'package:dio/dio.dart';
  
  void main() async {
    final dio = Dio();
    const url = "https://wpapi.ducafecat.tech/products/categories";
  
    dio.get(url).then((response) {
      print(response.data);
    });
  }
  

语法糖await

• import 'package:dio/dio.dart';
  
  void main() async {
    final dio = Dio();
    const url = "https://wpapi.ducafecat.tech/products/categories";
  
    Response<String> response = await dio.get(url);
    print(response);
  }
  

异步返回值

定义 Future<T> 返回对象；

• // dart_learn
  import 'package:dio/dio.dart';
  
  Future<String?> getUrl(String url) async {
    final dio = Dio();
    Response<String> response = await dio.get(url);
    return response.data;
  }
  

• import 'package:dart_learn/dart_learn.dart';
  
  void main() async {
    const url = "https://wpapi.ducafecat.tech/products/categories";
  
    var res = await getUrl(url);
    print(res);
  }