HarmonyOS 怎么设置list滚动条距离顶部位置

onDataReloaded会重新加载列表导致，可以给List添加scroller控制器，将列表跳回原先所在位置this.scroller.scrollToIndex，示例参考如下：

@Entry
@Component
struct RefreshDemo {
  @State isRefreshing: boolean = false
  @State arr: String[] = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10']
  private listScroller: Scroller = new Scroller();

  build() {
    Column() {
      Refresh({ refreshing: $$this.isRefreshing }) {
        List({ scroller: this.listScroller }) {
          ForEach(this.arr, (item: string) => {
            ListItem() {
              Text('' + item)
                .width('100%')
                .height(100)
                .fontSize(16)
                .textAlign(TextAlign.Center)
                .borderRadius(10)
                .backgroundColor(0xFFFFFF)
            }
          }, (item: string) => item)
        }
        .onScrollIndex((first: number) => {
          console.info(first.toString())
        })
        .width('100%')
        .height('100%')
        .divider({
          strokeWidth: 1,
          color: Color.Yellow,
          startMargin: 10,
          endMargin: 10
        })
        .scrollBar(BarState.Off)
      }
      .onRefreshing(() => {
        setTimeout(() => {
          this.isRefreshing = false
        }, 2000)
        this.arr.unshift('11')
        this.arr.unshift('12')
        this.listScroller.scrollToIndex(2)
      })
      .backgroundColor(0x89CFF0)
    }
  }
}
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可以通过滑动监听获取到index：

onScrollIndex(event: (start: number, end: number, center: number) => void): ListAttribute;
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