如何在angular 2中绑定双向单选按钮

<div>
  <input type="radio" name="option" [(ngModel)]="selectedOption" value="option1"> Option 1
  <input type="radio" name="option" [(ngModel)]="selectedOption" value="option2"> Option 2
  <input type="radio" name="option" [(ngModel)]="selectedOption" value="option3"> Option 3
</div>

export class MyComponent {
  selectedOption: string;
}

export class MyComponent {
  selectedOption: string;

  constructor() {
    this.selectedOption = 'option1'; // 初始化为选中的值
  }
}