HarmonyOS List, LazyForEach调用删除方法，删除比如2-4，只会删除掉3和4

//批量删除 收件箱
private deleteMsgList(positionArray: Array<number>) {
  let sender = MessageApi.deleteMsgList(this.idList)
  JUNetRequest.request(sender, (resultCallBack) => {
    Logger.debug(`批量删除接口:${JSON.stringify(resultCallBack.result)}`)
    Logger.debug(`批量删除接口:${positionArray}`)
    this.idList.length = 0
    if (resultCallBack.success) {
      positionArray.forEach(position => {
        this.dataList.deleteData(position)
      })
      this.dataList.reloadData();
    }
  })
}                Array<Number>比如是1.2.3我，调用 上述代码后，只删除了2，3没有删除1.   //删除单个数据
public deleteData(index:number):void{
  this.dataList.splice(index,1)
  this.notifyDataDelete(index)
}，
public reloadData():void{
  this.notifyDataReload()
}