How to stop rxjs timer

问题:

I have the following timer:

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

          })
        );
      }

How can I stop the timer? E.g. when a user clicks on a button...

回答1:

assuming you are using angular, if you use javascript only you can just us fromEvent() to create userClick

userClick=new Subject()

click(){userClick.next()}

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

          })
        );
      }