问具有可观测性的ngFor？

EN

@Component({
   selector: 'my-app',
   template: `
   <div>
     <h2>Wikipedia Search</h2>
     <input type="text" [formControl]="term"/>
     <ul>
       <li *ngFor="let item of items | async">{{item}}</li>
     </ul>
   </div>
 `
 })
export class App {

   items: Observable<Array<string>>;
   term = new FormControl();

   constructor(private wikipediaService: WikipediaService) {
        this.items = this.term.valueChanges
             .debounceTime(400)
             .distinctUntilChanged()
             .switchMap(term => this.wikipediaService.search(term));
    }
 }

// in the service
getItems(){
    return Observable.interval(2200).map(i=> [{name: 'obj 1'},{name: 'obj 2'}])
}

// in the controller
Items: Observable<Array<any>>
ngOnInit() {
    this.items = this._itemService.getItems();
}

 // in template
 <div *ngFor='let item of items | async'>
      {{item.name}}
 </div>