.pipe(
    switchMap(data => {
      this.ticketService.setListOfTickets(data.game.tickets);
      return this.ticketService.getListOfTickets().pipe(
        map(listOfTickets => ({ ...data, listOfTickets }))
      );
    })
)
.subscribe(({ game, prizes, listOfTickets }) => {
    this.listOfTickets = listOfTickets;
    this.game = game;
    this.type = game.type;
    this.combinations = prizes.map((el: Prize) => el.patterns).flat();
});

switchMap获取firstCall的结果，并使用该结果切换到内部可观察对象。

你可以使用forkJoin将多个调用加入到一个订阅中。在你的代码中看不到你订阅的函数的名称，所以我只使用name：* 游戏服务.getGames（）*

forkJoin([this.gameService.getGames(),this.ticketService.getListOfTickets()]).subscribe((data) => {
        const { game, prizes } = data[0];
        this.ticketService.setListOfTickets(game.tickets);
        this.listOfTickets = data[1];
        this.game = game;
        this.type = game.type;
        this.combinations = prizes.map((el: Prize) => el.patterns).flat();
      });