本节目标

  • 调用异步 等待、递归
  • 异步返回值

环境

  • Dart 2.1.0

调用异步 回调

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import 'package:dio/dio.dart';

void main() {
  Dio dio = new Dio();
  dio.get("https://www.baidu.com").then((response) {
    print(response.data);
  });
}

then 的方式异步回调

调用异步 等待

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import 'package:dio/dio.dart';

void main() async {
  Dio dio = new Dio();
  Response<String> response = await dio.get("https://www.baidu.com");
  print(response.data);
}

async 写在函数定义
await 写在异步请求头

异步返回值

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import 'package:dio/dio.dart';

void main() async {
  var content = await getUrl('https://www.baidu.com');
  print(content);
}

Future<String> getUrl(String url) async {
  Dio dio = new Dio();
  Response<String> response = await dio.get(url);
  return response.data;
}

定义 Future<T> 返回对象

代码

参考

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