Angular Observables 和 Http

使用Angular Observables和Http进行异步操作

typescript
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
@Injectable({
  providedIn: 'root'
})
export class UserService {
  private apiUrl = 'https://jsonplaceholder.typicode.com/users';
  constructor(private http: HttpClient) { }
  getUsers(): Observable {
    return this.http.get(this.apiUrl);
  }
}

typescript
import { Component, OnInit } from '@angular/core';
import { UserService } from './user.service';
@Component({
  selector: 'app-user-list',
  template: `
    
User List
    
      
{{ user.name }}
    
  `
})
export class UserListComponent implements OnInit {
  users$;
  constructor(private userService: UserService) { }
  ngOnInit() {
    this.users$ = this.userService.getUsers();
  }
}