HarmonyOS scroll滑动问题

import Curves from '@ohos.curves'  
@Entry  
@Component  
struct Index {  
  scroller: Scroller = new Scroller()  
  private arr: number[] = [0,1,2,3,4,5,6]  
  build() {  
    Stack({ alignContent: Alignment.TopStart }) {  
      Scroll(this.scroller) {  
        Column() {  
          ForEach(this.arr, (item: number) => {  
            Text(item.toString())  
              .width('90%')  
              .height(150)  
              .backgroundColor(0xFFFFFF)  
              .borderRadius(15)  
              .fontSize(16)  
              .textAlign(TextAlign.Center)  
              .margin({ top: 10 })  
          }, (item: string) => item)  
        }.width('100%')  
      }  
      .scrollable(ScrollDirection.Vertical) // 滚动方向纵向  
      .scrollBar(BarState.On) // 滚动条常驻显示  
      .scrollBarColor(Color.Gray) // 滚动条颜色  
      .scrollBarWidth(10) // 滚动条宽度  
      .friction(0.6)  
      .edgeEffect(EdgeEffect.None)  
    }.width('100%').height('100%').backgroundColor(0xDCDCDC)  
  }  
}