Question

我有两个这样的订阅：

this.birthdays = await this.birthdaySP.getBirthdays();
this.birthdays.subscribe(groups => {
    const allBirthdayT = [];
    groups.map(c => {
      allBirthdayT.push({
        key: c.payload.key, 
        ...c.payload.val()
      })
    })

    console.log(allBirthdayT);
});

this.birthdaysInGroups = await this.birthdaySP.getBirthdaysInGroups();
this.birthdaysInGroups.subscribe(groups => {
    const allBirthdayB = [];
    groups.map(c => {
      c.birthdays.subscribe(d => {
        d.map(e => {
          allBirthdayB.push(e);
        })
      })
    })

    console.log(allBirthdayB);
});

我想等待这两个订阅的结尾，比较allBirthdayB和allBirthdayT数组（我在两个console.log中接收数据）。

this.birthdaySP.getBirthdays（）和 this.birthdaySP.getBirthdaysInGroups（）是两个从Firebase接收数据的可观察对象。

第一个Observable就是这样：

async getBirthdays() {
   const user = await this.authSP.getUserInfo();
   return this.angularFire.list('birthdays', ref => ref.orderByChild('creator_user_id').equalTo(user.uid)).snapshotChanges();
}

我尝试使用forkJoin，但我不知道如何使用它来解决此问题

有什么提示吗？

Answer 1

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示例：

combineLatest()

等待两个订阅结束

1 个答案: