HarmonyOS 点击事件的回调方法

示例参考如下：

@Component
export struct ListChildItem {
  onClickOK?: (isOn: boolean) => void;

  build() {
    Column() {
      Toggle({ type: ToggleType.Switch, isOn: false })
        .selectedColor($r('app.color.start_window_background'))
        .onChange((isOn: boolean) => {
          if (this.onClickOK !== undefined) {
            this.onClickOK(isOn)
          }
        })
    }
  }
}

List({ space: 20, initialIndex: 0 }) {
  ForEach(this.dataList, (item: number) => {

    ListChildItem({
      onClickOK: (isOk: boolean) => {
        console.log('isok------', isOk)
      }
    })

  }, (item: string) => item)
}