angular - rxjs takeUntil 不执行finalize

Question

我有以下倒计时:

userClick=new Subject()

resetCountdown(){this.userClick.next()}

setCountDown() {
    let counter = 5;
    let tick = 1000;
    this.countDown = timer(0, tick)
    .pipe(
      take(counter),
      map(() => --counter),
      takeUntil(this.userClick),
      finalize(() => {
        if (this.currentQuestionNumber < this.questionsToAsk)
          this.showNextQuestion();
        else {
          this.endQuiz();
        }

      })
    );
}

当 takeUntil(this.userClick) 发生时，我不希望执行 finalize。有没有可能实现这一目标？我只希望在倒计时达到 0 并且之前未被 takeUntil

打断时执行 finalize

Answer 1

您可以使用tap 来检查该值是否已达到您的目标并执行副作用。
有点像

function setCountDown() {
    let counter = 5;
    let tick = 1000;
    this.countDown = timer(0, tick)
      .pipe(
        take(counter + 1),
        map(value => counter - value),
        tap(value => {
          if (value === 0) {
            console.log('OUT OF TIME');
          }
        }),
        takeUntil(userClick)
      )
}

查看此 example