纯js实现页面返回顶部的动画

啥也不说了,直接上代码

   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);

需要的请随意拿走....