Angular 表单

<!--响应式表单-->
<form [formGroup]="formModel" (submit)="submit()">

   <input formControlName="username">
  <div formGroupName="dateRange">
    起始日期：<input  type="date" formControlName="from">
    截止日期：<input  type="date" formControlName="to">
  </div>

 <div>
   <ul formArrayName="emails">
     <li *ngFor="let e of this.formModel.get(‘emails‘).controls; let i=index;">
       <input type="text" [formControlName]="i">
     </li>
   </ul>
 </div>
  <button type="button" (click)="addEmail()">增加</button>
  <div><button type="submit">保存</button></div>
</form>