main.dart

import "dart:async";

void main() {
  run();
}

Future<void> run() async {
  int count = 0;
  final timer = Timer.periodic(Duration(seconds:1), (timer) {
    print(count++);
  });
  
//   我们常用的  
//   await fakeRequest1();
//   await fakeRequest2();
  
  // 应该这么写
  final a = fakeRequest1();
  final b = fakeRequest2();
  await a;
  await b;
  
  
  timer.cancel();
}

Future<void> fakeRequest1() async {
  await Future.delayed(Duration(seconds: 5));
}

Future<void> fakeRequest2() async {
  await Future.delayed(Duration(seconds: 3));
}