Uncaught ReferenceError: s is not defined [closed]

// Call Main Slider 
jQuery('#main-slider').slippry({
  // general elements & wrapper


  // options
  adaptiveHeight: false, // height of the sliders adapts to current slide
  start: '1', // num (starting from 1), random
  loop: true, // first -> last & last -> first arrows
  captionsSrc: 'li',
  captions: 'custom', // Position: overlay, below, custom, false
  captionsEl: '.external-captions',

  // transitions
  transition: 'fade', // fade, horizontal, kenburns, false
  easing: 'linear', // easing to use in the animation [(see... [jquery www])]
  continuous: false,

  // slideshow
  auto: true
});

// Call Services Slider 
jQuery('#services-slider').slippry({
  // general elements & wrapper


  // options
  adaptiveHeight: false, // height of the sliders adapts to current slide
  start: '1', // num (starting from 1), random
  loop: false, // first -> last & last -> first arrows
  captionsSrc: 'li',
  captions: 'custom', // Position: overlay, below, custom, false
  captionsEl: '.external-captions',

  // transitions
  transition: 'horizontal', // fade, horizontal, kenburns, false
  easing: 'linear', // easing to use in the animation [(see... [jquery www])]
  continuous: true,

  // slideshow
  auto: false
});

// Add smooth scrolling on all links inside the navbar
jQuery(".navbar a").on('click touch', function (event) {
  'use strict';
  // Get a safe height for scrolling to

  // Make sure this.hash has a value before overriding default behavior
  if (this.hash !== "") {

    // Prevent default anchor click behavior
    event.preventDefault();

    // Store hash
    var hash = this.hash;

    // Using jQuery's animate() method to add smooth page scroll
    // The optional number (800) specifies the number of milliseconds it takes to scroll to the specified area
    $('html, body').animate({
      scrollTop: $(hash).offset().top
    }, 800, function () {

      // Add hash (#) to URL when done scrolling (default click behavior)
      window.location.hash = hash;
    });

  } // End if

});

$(document).ready(function ($) {
  'use strict';
  // Setup variables
  var $window = $(window);
  var $slide = $('.homeSlide');
  var $body = $('body');

  //FadeIn all sections   
  $body.imagesLoaded(function () {
    setTimeout(function () {

      // Resize sections
      adjustWindow();

      // Fade in sections
      $body.removeClass('loading').addClass('loaded');

    }, 800);
  });

  function adjustWindow() {


    if (!(/Android|iPhone|iPad|iPod|BlackBerry|Windows Phone/i).test(navigator.userAgent || navigator.vendor || window.opera)) {
      skrollr.init({
        forceHeight: false
      });
    }

    // Get window size
    var winH = $window.height();

    // Keep minimum height 500
    if (winH <= 500) {
      winH = 500;
    }

    // Refresh Skrollr after resizing our sections
    s.refresh($('.homeSlide'));

  }

});

(function ($) {
  "use strict";

  function count($this) {
    var current = parseInt($this.html(), 10);
    current = current + 1; /* Where 50 is increment */
    $this.html(++current);
    if (current > $this.data('count')) {
      $this.html($this.data('count'));
    } else {
      setTimeout(function () {
        count($this);
      }, 50);
    }
  }
  $(".stat-count").each(function () {
    $(this).data('count', parseInt($(this).html(), 10));
    $(this).html('0');
    count($(this));
  });
})(jQuery);

window.onscroll = function () {
  'use strict';
  scrollFunction();
};

function scrollFunction() {
  'use strict';
  if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
    document.getElementById("myBtn").style.display = "block";
  } else {
    document.getElementById("myBtn").style.display = "none";
  }
}

// When the user clicks on the button, scroll to the top of the document
function topFunction() {
  'use strict';
  $("html, body").animate({
    scrollTop: 0
  }, 1000);
  document.documentElement.scrollTop = 0; // For IE and Firefox
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>