httpservice中的Angular2错误

Question

我在＆＃39; https://angular.io/tutorial/toh-pt6＆＃39;中学习了Angular，但在编译时，它说“找不到内存中的角度 - 网络API”，所以我添加＆ ＃34;角内存的Web-API＆＃34;：＆＃34;〜0.3.0＆＃34;在package.json中。 但是当它运行时，它在英雄细节和英雄搜索

中都没有显示任何内容

https://angular.io/tutorial/toh-pt6中的所有代码都相同 有人可以帮助我

这里是app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule }   from '@angular/forms'; // <-- NgModel lives here
import {HttpModule} from '@angular/http';

import { AppComponent } from './app.component';
import {DashBoardComponent} from './dashboard.component';
import {HeroDetailComponent} from './hero-detail.component';
import {HerosComponent} from './heros.component';
import {HeroService} from './hero.service';
import {HeroSearchComponent} from './hero-search.component';

import {AppRoutingModule} from './app-routing.module';

//import for loading & configuring the in-memory web api
import {InMemoryWebApiModule} from 'angular-in-memory-web-api';
import {InMemoryDataService} from './in-memory-data.service';

@NgModule({
  declarations: [
    AppComponent,
    HeroDetailComponent,
    HerosComponent,
    DashBoardComponent,
    HeroSearchComponent
  ],
  imports: [
    BrowserModule,
    FormsModule, // <-- import the FormsModule before binding with [(ngModel)]
    AppRoutingModule,
    HttpModule,
    InMemoryWebApiModule.forRoot(InMemoryDataService)
  ],
  providers: [HeroService],
  bootstrap: [AppComponent]
})
export class AppModule { }