HarmonyOS 分段按钮的监听事件

// 1. 单选模式  
@State singleSelectCapsuleOptions: SegmentButtonOptions = SegmentButtonOptions.capsule({  
  buttons: [{ text: '单选按钮1' }, { text: '单选按钮2' }, { text: '单选按钮3' }] as SegmentButtonItemTuple,  
  multiply: false,  
  backgroundBlurStyle: BlurStyle.BACKGROUND_THICK  
})  
// 2、监听索引变化  
@State @Watch('onSegmentButtonChange') singleSelectCapsuleSelectedIndexes: number[] = [0]  
  
// @Watch 回调  
onSegmentButtonChange() {  
  console.log(`选中按钮索引 -- ${this.singleSelectCapsuleSelectedIndexes}`);  
}  
  
// 3、组件声明  
SegmentButton({ options: this.singleSelectCapsuleOptions,  
  selectedIndexes: $singleSelectCapsuleSelectedIndexes })