在angular 2.0中使用Heroes示例中的实时API需要做哪些更改

import { HttpClientModule } from '@angular/common/http';

@NgModule({
  imports: [
    HttpClientModule
  ],
  ...
})
export class AppModule { }

ng generate service api

import { HttpClient } from '@angular/common/http';

@Injectable({
  providedIn: 'root'
})
export class ApiService {
  private apiUrl = 'https://api.example.com'; // 实时API的URL

  constructor(private http: HttpClient) { }

  getHeroes(): Observable<Hero[]> {
    return this.http.get<Hero[]>(`${this.apiUrl}/heroes`);
  }

  // 其他API请求方法...
}

import { Component, OnInit } from '@angular/core';
import { ApiService } from './api.service';

@Component({
  selector: 'app-heroes',
  templateUrl: './heroes.component.html',
  styleUrls: ['./heroes.component.css']
})
export class HeroesComponent implements OnInit {
  heroes: Hero[];

  constructor(private apiService: ApiService) { }

  ngOnInit() {
    this.getHeroes();
  }

  getHeroes(): void {
    this.apiService.getHeroes()
      .subscribe(heroes => this.heroes = heroes);
  }
}