我需要该应用程序在加载数据之前不做任何事情.

app.module.ts

import { NgModule,APP_INITIALIZER } from '@angular/core';
import { Http,HttpModule,JsonpModule } from '@angular/http';
import { UserService } from '../services/user.service';

<...>
@NgModule({
  imports: [
    BrowserModule,FormsModule,JsonpModule,routing
  ],declarations: [
    AppComponent,<...>
  ],providers: [
    <...>
    UserService,{provide: APP_INITIALIZER,useFactory: (userServ: UserService) => () => userServ.getUser(),deps: [UserService,Http],multi: true
    }
  ],bootstrap: [AppComponent]

user.service.ts

@Injectable()
export class UserService {

    public user: User;
    constructor(private http: Http) { }

    getUser(): Promise<User> {
        console.log('get user called');
        var observable= this.http.get('/auth/getuser',{ headers: getHeaders() })
            .map(extractData);

        observable.subscribe(user => {this.user = user;
            console.log(this.user)});
        return observable.toPromise();
    }
}