import 'dart:async';
Future<void> printDailyNewsDigest() async {
var newsDigest = await gatherNewsReports();
print(newsDigest);
}
Future printStackInfo() {
return new Future.delayed(Duration(seconds: 1)).then((_) {
return '热门股票: 中国人瘦';
});
}
printWinningLotteryNumbers() {
print('双色球: [23, 63, 87, 26, 2]');
}
printWeatherForecast() {
print("天气预报: 23°c, 晴");
}
printBaseballScore() {
print('球讯: 火箭-湖人');
}
var news = '新闻播报到次结束';
const oneSecond = Duration(seconds: 3);
Future<String> gatherNewsReports() => Future.delayed(oneSecond, () => news);
main() {
printStackInfo().then((info) {
print(info);
});
printDailyNewsDigest();
printWinningLotteryNumbers();
printWeatherForecast();
printBaseballScore();
}
执行结果：
双色球: [23, 63, 87, 26, 2]
天气预报: 23°c, 晴
球讯: 火箭-湖人
热门股票: 中国人瘦
新闻播报到次结束
