弹窗下面的页面滚动问题

let bodyEl = document.body

let top = 0

 

function stopBodyScroll (isFixed) {

 if (isFixed) {

 top = window.scrollY

 

 bodyEl.style.position = 'fixed'

 bodyEl.style.top = -top + 'px'

 } else {

 bodyEl.style.position = ''

 bodyEl.style.top = ''

 

 window.scrollTo(0, top) // 回到原先的top

 }

}