如何在RXJS中满足条件后立即取消订阅

takeWhile

this.router.events
  .pipe(
    takeWhile(url => url === ...), // when the condition isn't met it'll complete immediatelly
  )
  .subscribe(...);

this.router.events
  .pipe(
    concatMap(url => url === ... ? of(url, null) : of(url)),
    takeWhile(Boolean),
  )
  .subscribe(...);

Subject takeUntil

unsubscribe = new Subject<any>();

this.router.events.pipe(takeUntil(unsubscribe)).subscribe((url: any) => {
    url = this.router.url;
    if ((url === "/profile" || url === "/summary") && this.filterConfigFlag === false) {

        /*
        Perform operations
        */
this.unsubscribe.next();
    } else {
        console.log(typeof (url), url);
this.unsubscribe.next();
    }
});