问在AngularJS 2中可以有两个用于单次呼叫服务模板

EN

class MyService {
  private _list1;
  private _list2;

  getList1() {
    if(this._list1) {
      return Observable.of(this._list1);
    } else {
      return _getList(1);
    }
  }

  getList2() {
    if(this._list2) {
      return Observable.of(this._list2);
    } else {
      return _getList(2);
    }
  }

  private _getList(listNo) {
    return this.http.get(url).map(res => {
      var json = res.json();
      this._list1 = value.list1;
      this._list2 = value.list2;
      if(listNo == 1) {
        return json.list1;
      }
      if(listNo == 2) {
        return json.list2;
      }
    });
  }
}

@Component({
  selector: 'my-component1',
  pipes: [KeysPipe],
  template: `
  <ul>
     <li *ngFor="let item of list | keys">{{item.key}} - {{item.value}}</li>
  </ul>
`
})
export class MyComponent1 {
  constructor(private MyService myService) {
    myService.getList1().subscribe.(value => this.list = value);
  }
}

@Component({
  selector: 'my-component2',
  pipes: [KeysPipe],
  template: `
  <ul>
     <li *ngFor="let item of list | keys">{{item.key}} - {{item.value}}</li>
  </ul>
`
})
export class MyComponent2 {
  constructor(private MyService myService) {
    myService.getList2().subscribe.(value => this.list = value);
  }
}