index.js

"use strict";

// $(window).on("load", function() {
//   $("#countdown").countdown($("#countdown").attr("data-time"), function(e) {
//       $(this).html(e.strftime("<div>%D<span>Days</span></div> <div>%H<span>Hours</span></div> <div>%M<span>Minutes</span></div> <div>%S<span>Seconds</span></div>"))
//   });
// });

function animateWithRandomNumber(myClass, from, to) {
    TweenMax.fromTo(myClass, Math.floor(Math.random() * (60 - 2 + 1) + 2) * 0.5 + 0.5, { y: from }, { y: to,
        onComplete: animateWithRandomNumber,
        onCompleteParams: [myClass, from, to],
        ease: Linear.easeNone });
}

var itemsDown = [".light4", ".light5", ".light6", ".light7", ".light8", ".light11", ".light12", ".light13", ".light14", ".light15", ".light16"].forEach(function (e) {
    return animateWithRandomNumber(e, -1080, 1080);
});
var itemsUp = [".light1", ".light2", ".light3", ".light9", ".light10", ".light17"].forEach(function (e) {
    return animateWithRandomNumber(e, 1080, -1080);
});