HarmonyOS Scroll组件回调事件问题

.onScroll((xOffset: number, yOffset: number) => { 
  // console.log(yOffset.toString()) 
  // this.scrollY += yOffset 
 
  // this.tabPosY = this.topAreaHeight - this.scrollY <= 0 ? 0 : this.topAreaHeight - this.scrollY 
  this.tabPosY = this.topAreaHeight - this.scroller.currentOffset() 
    .yOffset <= 0 ? 0 : this.topAreaHeight - this.scroller.currentOffset() 
    .yOffset 
  // console.log(TAG, `Scrollview is scrolling, scrollY: ${this.scrollY}, tabPosY: ${this.tabPosY}`); 
})