gistfile1.js

function responsive() {
      function initResponsive() {}
      $(window).scroll(function () {
        if (window.matchMedia("(max-width: 1024px)").matches && $(document).scrollTop() > 0) {
          $('.main-header').addClass('u-fixed');
        } else {
          $('.main-header').removeClass('u-fixed');
        }
      });
      $(window).resize(function () {
        initResponsive();
      });
      $(document).ready(function () {
        initResponsive();
      });
    }