Wow.js repeat animation on scroll up or down

wowjs-repeat-animation.js

  WOW.prototype.addBox = function(element) {
    this.boxes.push(element);
  };

  // Init WOW.js and get instance
  var wow = new WOW();
  wow.init();

  // Attach scrollSpy to .wow elements for detect view exit events,
  // then reset elements and add again for animation
  $('.wow').on('scrollSpy:exit', function() {
    $(this).css({
      'visibility': 'hidden',
      'animation-name': 'none'
    }).removeClass('animated');
    wow.addBox(this);
  }).scrollSpy();