使用RxJS刷新/重新加载Hot Observable序列

您可以尝试引入subject触发器获取:

private fetchTrigger = new BehaviorSubject(null);

triggerFetch() {
  this.fetchTrigger.next();
}

fetch() {
  this.userObservable = Observable
    .combineLatest(
      Observable.fromPromise(this.getToken()),
      this.fetchTrigger
    )
    .switchMap(([token]) => {
      ...
    })
    ...
    .publishLast()
    .refCount();
}

private fetchTrigger = new BehaviorSubject(null);

triggerFetch() {
  this.fetchTrigger.next();
}

fetch() {
  this.userObservable = this.fetchTrigger
    .switchMap(() => Observable.fromPromise(this.getToken()))
    .switchMap(token => {
      ...
    })
    ...
    .publishLast()
    .refCount();
}