如何在javascript中定义现有对象属性的setter

如何在JavaScriptES6概念中定义现有对象属性的setter。 目前,我已经直接将值赋给了true,我希望通过使用setter实现相同的值。

HTML:

<form #Form="ngForm" novalidate (ngSubmit)="saveForm()">
<label class="radio-inline pr-3">
<input type="radio" name="isCitizen" required value="yes [(ngModel)]="formList.isCitizen" #isCitizen="ngModel"> Yes
</label>
<label class="radio-inline">
<input type="radio" name="isCitizen" required value="no"[(ngModel)]="formList.isCitizen"#isCitizen="ngModel"> No
</label>
<form>

组件:

 import { Component } from '@angular/core';

 @Component({
 selector: 'my-app',
 templateUrl: './app.component.html',
 styleUrls: [ './app.component.css' ]
 })
 export class AppComponent  {
 name = 'Angular';
 formList: FormModel = new FormModel();

 saveForm(){ //how to set the value to object using setter
 if(this.formList.isCitizen === 'yes'){
 this.formList.isCitizen = true;
 }else{
 this.formList.isCitizen = false;
 }
 }
 }

 export class FormModel {
 isCitizen : boolean;
 }

Demo