纯JS实现页面平滑滚动回顶部的简单方案

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);