js禁止蒙层底部页面跟随滚动

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 } }