Angular/RxJS如何使用可观察管道生成ajax调用层次结构，但返回单个响应？

npm install rxjs

import { Observable } from 'rxjs';
import { map, catchError } from 'rxjs/operators';

import { Observable } from 'rxjs';
import { map, catchError } from 'rxjs/operators';
import { HttpClient } from '@angular/common/http';

@Injectable()
export class DataService {
  constructor(private http: HttpClient) {}

  getData(): Observable<any> {
    return this.http.get('https://api.example.com/data').pipe(
      map(response => {
        // 对响应进行处理
        return response;
      }),
      catchError(error => {
        // 处理错误
        return Observable.throw(error);
      })
    );
  }
}

import { Component, OnInit } from '@angular/core';
import { DataService } from './data.service';

@Component({
  selector: 'app-data',
  template: `
    <div>{{ data }}</div>
  `
})
export class DataComponent implements OnInit {
  data: any;

  constructor(private dataService: DataService) {}

  ngOnInit() {
    this.dataService.getData().subscribe(
      response => {
        // 处理响应数据
        this.data = response;
      },
      error => {
        // 处理错误
        console.error(error);
      }
    );
  }
}