在一定时间段内,如何自动停止observable.timer()或observable.interval()


public function(id: number) {
    this.periodicCheckTimer = Observable.timer(10000, 5000).subscribe(
        () => {
          let model = this.find(id);
          if (model['isActivated']) {
            this.periodicCheckTimer.unsubscribe();
          }
        });
  }

如果不满足(model ['iSactivated'])不满足,我想在5分钟后自动停止计时器。但是,如果条件满足,我可以手动停止它。在这种情况下,不确定手动停止是否仍然正确。

也赞赏使用其他计时器功能的任何建议。

我没有测试,但这是您提案的替代方法,在5mn之后停止:

function (id: number) {
  // emit a value after 5mn
  const stopTimer$ = Observable.timer(5 * 60 * 1000);
  Observable
    // after 10s, tick every 5s
    .timer(10000, 5000)
    // stop this observable chain if stopTimer$ emits a value
    .takeUntil(stopTimer$)
    // select the model
    .map(_ => this.find(id))
    // do not go further unless the model has a property 'isActivated' truthy
    .filter(model => model['isActivated'])
    // only take one value so we don't need to manually unsubscribe
    .first()
    .subscribe();
}