获取Scroll容器组件内指定组件的坐标值

...  
    scroller: Scroller = new Scroller()  
    private componentsInfo: Position[] = []  
    private currentId: number = 1 // 要滚动的子组件索引  
... 
Stack() { 
  Scroll(this.scroller) { 
    Column() { 
      Button('LazyForEach') 
        .fontSize(20) 
        .margin({ bottom: 20 }) 
        .fontWeight(FontWeight.Bold) 
        .onAreaChange((oldValue: Area, newValue: Area) => { 
          this.componentsInfo[0] = newValue.position 
        }) 
      Button('web H5') 
        .fontSize(20) 
        .margin({ bottom: 20 }) 
        .fontWeight(FontWeight.Bold) 
        .onAreaChange((oldValue: Area, newValue: Area) => { 
          this.componentsInfo[1] = newValue.position 
        }) 
    } 
  } 
  Button('WebH5').onClick(() => { 
    this.scroller.scrollTo({ xOffset: 0, yOffset: this.componentsInfo[this.currentId].y as number }) 
  }) 
}
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