纯js实现页面返回顶部的动画(超简单)

var scrollTop = document.body.scrollTop;  document.body.style.marginTop = -scrollTop + 'px';  document.body.scrollTop = 0;  document.body.style.transition = 'all 1s ease-in-out';  document.body.style.marginTop = 0;  setTimeout(function () { document.body.style.transition = 'none'; }, 1000);