typescript mergeMap Rxjs嵌套请求

Posted 2021-05-20

import { Component } from '@angular/core';
import { Http } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import { mergeMap } from 'rxjs/operators';

@Component({
  selector: 'app-root',
  templateUrl: 'app/app.component.html'
})
export class AppComponent {
  homeworld: Observable<{}>;
  constructor(private http: HttpClient) { }
  
  ngOnInit() {
    this.homeworld = this.http.get('/api/people/1').pipe(
      mergeMap(character => this.http.get(character.homeworld))
    );
  }
}