小编Thu*_*asi的帖子

我试过像英雄之旅这样的示例应用程序.

我试图将服务cal转换为http get(InMemoryDbService),如下所示

hero.service.ts

import {Injectable} from '@angular/core';
import {HttpModule, Headers, Http} from '@angular/http';
import 'rxjs/add/operator/toPromise';

import {Hero} from './hero';

@Injectable()
export class HeroService {

    private heroesUrl = 'app/heroes'; 

    constructor(private http : Http) { }

    // working code
    //getHeroes(): Promise<Hero[]> {
    //    return Promise.resolve(HEROS);
    //}

    getHeroes(): Promise<Hero[]> {
        debugger;
        return this.http.get(this.heroesUrl).toPromise().then(responce => responce.json().data as Hero[]).catch(this.handleError);

    }
    private handleError(error: any): Promise<any> {
        console.error('An error occurred', error); // for demo purposes only
        return Promise.reject(error.message || error);
    }
}

内存-data.service.ts

    import {InMemoryDbService} from …