js 页面平滑滚动到页面顶部

//回到顶部
const scrollToTop = () => {
const fromTopDistance = document.documentElement.scrollTop || document.body.scrollTop;
if (fromTopDistance > 0) {
window.requestAnimationFrame(scrollToTop);
window.scrollTo(0, fromTopDistance - fromTopDistance/ 8);
}
}
//执行此方法
scrollToTop()