Scroll function cause zepto doesn't have scrolltop animation

scrollTo.js

// Scroll function cause zepto doesn't have scrolltop animation
;function scrollNew(scrollTo, time) {
  var scrollFrom = parseInt(document.body.scrollTop),
    i = 0,
    runEvery = 5,  // run every 5ms
    time = time || 1000,
    interval
    ;

  scrollTo = parseInt(scrollTo);
  time = time / runEvery;

  interval = setInterval(function () {
    i++;
    document.body.scrollTop = (scrollTo - scrollFrom) / time * i + scrollFrom;
    document.documentElement.scrollTop = (scrollTo - scrollFrom) / time * i + scrollFrom;
    if (i >= time) {
        clearInterval(interval);
    }
  }, runEvery);
}