debounce

debounce.js

function debounce(fn){
		var id, timestamp;
		var wait = 99;
		var check = function(){
			var last = (Date.now()) - timestamp;

			if (last < wait) {
				id = setTimeout(check, wait - last);
			} else {
				id = null;
				fn();
			}
		};
		return function(){
			timestamp = Date.now();
			if(!id){
				id = setTimeout(check, wait);
			}
		};
	}