themes/docsy/layouts/partials/scripts-home.html

<script>
  initBanner();
  openDemoDropdown();

  function initBanner() {
    $('.banner-nav li').click(function () {
      var index = $(this).index();
      $(this).addClass('active').siblings().removeClass('active');
      $('.banner-wrapper .img-item').eq(index).fadeIn().siblings().fadeOut();
    });
  }

  function openDemoDropdown() {
    if (location.hash === '#demo') {
      $('.btn-demo').trigger('click')
    }
  }
</script>