angular-docs-cn/public/docs/_examples/forms/dart/lib/hero_form_component_ngmodelchange.html

<!-- #docregion -->
<div class="container">
  <h1>Hero Form</h1>
  <form>
    <div class="form-group">
      <label for="name">Name</label>
	    <!-- #docregion ngModel-3 -->
      <input type="text" class="form-control" required
             [ngModel]="model.name"
             (ngModelChange)="model.name = $event" >
      TODO: remove this: {{model.name}}
	    <!-- #enddocregion ngModel-3 -->
    </div>

    <div class="form-group">
      <label for="alterEgo">Alter Ego</label>
      <input type="text" class="form-control"
             [(ngModel)]="model.alterEgo">
    </div>

    <div class="form-group">
      <label for="power">Hero Power</label>
      <select class="form-control" required
              [(ngModel)]="model.power">
        <option *ngFor="let p of powers" [value]="p">{{p}}</option>
      </select>
    </div>

    <button type="submit" class="btn btn-default">Submit</button>
  </form>
</div>