RxJs:一个接一个地执行3个观察结果,并使用第三个请求中的第一个和第二个请求的结果

您可以显式地将serviceN的值返回到serviceN+1。我的想法是:

private setupStuff() {
  this.initRouteParams()
    .pipe(
      switchMap(serviceId => {
        return zip(of(serviceId), this.getFileInfo(serviceId))
      }),
      switchMap(([serviceId, filename]) => {
        return zip(of(serviceId), of(filename), this.getExistingFile(serviceId, filename))
      })
    )
    .subscribe(([serviceId, filename, response]) => {
      console.log(serviceId, filename, response);
    })
}

编辑:

可以通过显式声明每个输入的类型来修复类型错误。您可能希望为 response .

成功地解决了这个问题:

private checkFilePresence(): void {
        const first$: Observable<string> = this.initRouteParams();
        const second$: Observable<string> = first$.pipe(
            switchMap(config => {
                return this.getFileInfo(config);
            })
        );
        const third$: Observable<CkitExistingFileResponse> = combineLatest(first$, second$).pipe(
            switchMap(([config, second]) => {
                return this.getExistingFile(config, second);
            })
        );
        combineLatest(first$, third$)
            .subscribe(() => {
            });
    }

您可以按如下顺序对可观测数据进行订阅:

private setupStuff(): void {
        this.initRouteParams().subscribe( serviceId => {
            this.getFileInfo(serviceId).subscribe(fileName => {
               this.getExistingFile(serviceId, fileName).subscribe( response => {
                   console.log(response);
                });
            });
        });
}