HarmonyOS listItem怎么获取每条的高度，这样获取的高度不是按照顺序来的？

Swiper(this.swiperController!!) {  
     LazyForEach(this.calendarDataSource, (item: CalendarModelList) => {  
       Column() {  
         //日期列表  
         List() {  
           ForEach(this.changeData(item), (item: CalendarModelList) => {  
             ListItem() {  
               CalendarListItem({ dateList: item })  
             }.onAreaChange((oldValue: Area, newValue: Area) => {  
               if (newValue.height as number != oldValue.height as number) {  
                 console.info("item高度" + (newValue.height as number))  
               }  
             })  
           })  
         }