angular-docs-cn/public/docs/_examples/hierarchical-dependency-injection/ts/app/heroes.service.ts

import { Hero } from './hero';

export class HeroesService {
  heroes: Array<Hero> = [
    { name: 'RubberMan', power: 'flexibility'},
    { name: 'Tornado', power: 'Weather changer'}
  ];

  getHeroes () {
    return this.heroes;
  }
}