angular-docs-cn/public/docs/_examples/toh-4/ts/app/hero.service.ts

// #docplaster
// #docregion
// #docregion just-get-heroes
import { Injectable } from '@angular/core';

import { Hero } from './hero';
import { HEROES } from './mock-heroes';

@Injectable()
export class HeroService {
  // #docregion get-heroes
  getHeroes(): Promise<Hero[]> {
    return Promise.resolve(HEROES);
  }
  // #enddocregion get-heroes, just-get-heroes
  // #enddocregion
  // See the "Take it slow" appendix
  // #docregion get-heroes-slowly
  getHeroesSlowly(): Promise<Hero[]> {
    return new Promise<Hero[]>(resolve =>
      setTimeout(resolve, 2000)) // delay 2 seconds
      .then(() => this.getHeroes());
  }
  // #enddocregion get-heroes-slowly
  // #docregion
  // #docregion just-get-heroes
}