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              <p>SCROLL KE ATAS / BAWAH </p>

<div style="position:fixed; width: 100%; background:#ddd">
  <p><strong>Function calls:</strong></p>  
    <li>Ga pake debounce: <span id="count1">0</span></li>
    <li>Pake debounce: <span id="count2">0</span></li>
 * Dikopi dari underscore.js
function debounce(func, wait) {
	var timeout;
	return function() {
		var context = this, args = arguments;
		var later = function() {
			timeout = null;
			func.apply(context, args);
		var callNow = !timeout;
		timeout = setTimeout(later, wait);
		if (callNow) func.apply(context, args);

var count1 = 0;
var msg1 = document.getElementById("count1");
var fn1 = function(e) {
  msg1.innerText = 'call count: '+count1++ + ", scrollY:" + this.scrollY;

var count2 = 0;
var msg2 = document.getElementById("count2");
var fn2 = function(e) {
  msg2.innerText = 'call count: '+count2++ + ", scrollY:" + this.scrollY;

window.addEventListener("scroll", fn1);
//jalanin fn2 setelah scroll berhenti selama 500ms
window.addEventListener("scroll", debounce(fn2, 500));

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