如何在angular中以单变量存储replaysubject的数组？

import { ReplaySubject } from 'rxjs';

replaySubjects: ReplaySubject<any>[] = [];

constructor() {
  const replaySubject = new ReplaySubject<any>();
  this.replaySubjects.push(replaySubject);
}

addReplaySubject() {
  const replaySubject = new ReplaySubject<any>();
  this.replaySubjects.push(replaySubject);
}

subscribeToReplaySubject(index: number) {
  this.replaySubjects[index].subscribe(value => {
    console.log(value);
  });
}