angular-docs-cn/public/docs/_examples/testing/ts/app/hero.service.ts

// #docplaster
// #docregion
import { Hero } from './hero';
import { HEROES } from './mock-heroes';
import { Injectable } from '@angular/core';

@Injectable()
export class HeroService {
  getHeroes() {
    return Promise.resolve(HEROES);
  }

  // See the "Take it slow" appendix
  getHeroesSlowly() {
    return new Promise<Hero[]>(resolve =>
      setTimeout(() => resolve(HEROES), 2000) // 2 seconds
    );
  }

  // #docregion get-hero
  getHero(id: number) {
    return Promise.resolve(HEROES).then(
      heroes => heroes.filter(hero => hero.id === id)[0]
    );
  }
  // #enddocregion get-hero
}
// #enddocregion