const $window = $(window)
const $document = $(document)
const $nav = $('nav')
const $next = $nav.next()

const nail = e => {
  console.log($window.scrollTop())
  if ($window.scrollTop() > 600) {
    $nav.addClass('fix-top')
    $next.addClass('fix-top-next')
  } else {
    $nav.removeClass('fix-top')
    $next.removeClass('fix-top-next')
  }
}

$window.on('touchmove', nail)
$window.on('scroll', nail)