获取浏览器滚动条距离顶部位置

import { ref, onMounted, onUnmounted } from 'vue'
   export function handleScroll () {
     const scrollTopNum = ref('')
     const Scroll = () => {
       const top =
         document.documentElement.scrollTop ||
         document.body.scrollTop ||
         window.pageYOffset
       scrollTopNum.value = top
     }
     onMounted(() => {
       document.addEventListener('scroll', Scroll)
     })
     onUnmounted(() => {
       document.removeEventListener('scroll', Scroll)
     })
     return scrollTopNum
   }