HarmonyOS lazyForEach数据应用问题

清除dataArray中的数据：
deleteDataUseContent(data: T): void {
  let delIndex: number = -1
  for (let index = 0; index < this.originDataArray.length; index++) {
  const element = this.originDataArray[index];
  if (data === element) {
  delIndex = index
}
}
if (delIndex != -1) {
  this.deleteData(delIndex)
}
}

deleteData(index: number): void {
  this.originDataArray.splice(index, 1);
  this.notifyDataDelete(index);
}

clear() {
  this.originDataArray.splice(0, this.originDataArray.length)
  this.listeners.forEach(listener => {
    listener.onDataDelete(0)
  })
}
页面刷新：
refreshData() {
  let listData: listItemData[] = []
  for (let i = 0; i < titleCount; i++) {
    let text = '内容' + i + '-' + this.getRandomVal()
    let itemData: listItemData = {
      text,
      id: text
    }
    listData.push(itemData)
  }
  // 只刷新当前显示在屏幕的数据
  for (let i = this.startIndex; i <= this.endIndex; i++) {
    this.showList[i].textDataSource.setData(listData)
  }
  this.dataSource.refreshDataByIndex(this.startIndex, this.endIndex, this.showList.slice(this.startIndex, this.endIndex))
}