vue项目中获取body滚动距离

created() {
    window.addEventListener('scroll', this.handleScroll)
}
beforeDestroy() {
    window.removeEventListener('scroll', this.handleScroll)
},
methods: {
    handleScroll() {
      let top = Math.floor(document.documentElement.scrollTop || document.body.scrollTop)
      ...代码处理
    }
 }