scroll-view据顶部距离计算高度_scroll-view 当前元素距离顶端的scrolltop

<template>
	<view>
		<view class="tablist">
			<text v-for="item in tablist" :class="item.id==id?'text':''" @click="tabclick(item)">{
  {item.title}}</text>
		</view>
		<h3>{
  {title}}</h3>
		<scroll-view scroll-y="true" :style="`height: calc(100vh - ${top}px);`">
			<view class="list">
				<view class="listitem" v-for="item in list">
					{
  {item.title}}
				</view>
			</view>
		</scroll-view>
	</view>
</template>
 
<script>
	import {
		sbsdcat,
		sbsdlist
	} from '@/config/api/index.js'
	export default {
		data() {
			return {
				tablist: [],
				id: 35,
				title: '公共英语',
				list: [],
				top:''
			}
		},
		created() {
			this.getdata()
		},
		mounted() {
			cons