Prevent different types of scrolling, with disable and enable functions

prevent-scroll.js

/* Prevent Different Types of scrolling */
// left: 37, up: 38, right: 39, down: 40,
// spacebar: 32, pageup: 33, pagedown: 34, end: 35, home: 36
var keys = { 37: 1, 38: 1, 39: 1, 40: 1 };

function preventDefault(e) {
	e = e || window.event;
	console.log(e.target);
	if (e.preventDefault) e.preventDefault();
	e.returnValue = false;
}

function preventDefaultForScrollKeys(e) {
	if (keys[e.keyCode]) {
		preventDefault(e);
		return false;
	}
}

window.disableScroll = function () {
	if (window.addEventListener) // older FF
		window.addEventListener('DOMMouseScroll', preventDefault, false);
	window.onwheel = preventDefault; // modern standard
	window.onmousewheel = document.onmousewheel = preventDefault; // older browsers, IE
	window.ontouchmove = preventDefault; // mobile
	document.onkeydown = preventDefaultForScrollKeys;
};

window.enableScroll = function () {
	if (window.removeEventListener) window.removeEventListener('DOMMouseScroll', preventDefault, false);
	window.onmousewheel = document.onmousewheel = null;
	window.onwheel = null;
	window.ontouchmove = null;
	document.onkeydown = null;
};