HarmonyOS radio组件问题

@Entry  
@Component  
struct Page5 {  
  @State @Watch('radioChangeA') flagA : boolean = false;  
  @State @Watch('radioChangeB') flagB : boolean = false;  
  radioChangeA(){  
    console.info('触发修改A');  
  }  
  radioChangeB(){  
    console.info('触发修改B');  
  }  
  build() {  
    Row() {  
      Column() {  
        Text('Radio1')  
        Radio({ value: 'Radio1', group: 'radioGroup' }).checked($$this.flagA)  
        Radio({ value: 'Radio2', group: 'radioGroup' }).checked($$this.flagB)  
      }  
      .width('100%')  
    }  
    .height('100%')  
  }  
}