下拉列表如何实现双向绑定呀?在angualr2里面怎么实现
<div class="form-group"> <select class="form-control" [(ngModel)]="newbook.bookcycle"> <option value="">{{ 'Cycle' | translate }}</option> <option *ngFor="let c of bookcycle" [value]="c.bookcycle"> {{pod.code}} </option> </select> </div>