// 获取元素
let div = document.getElementsByClassName('goods_detail')[0]
// 获取距离页面顶部的偏移值
let div_scrolltop = div.offsetTop
// 获取元素
let div = document.getElementsByClassName('goods_detail')[0]
// 获取距离页面顶部的偏移值
let div_scrolltop = div.offsetTop