localStorage

function set(key, value) {
	var curTime = new Date().getTime();
	localStorage.setItem(key, JSON.stringify({
		data: value,
		time: curTime
	}));
}

function get(key) {
	var data = localStorage.getItem(key);
	if(data) {
		var dataObj = JSON.parse(data);
		if(new Date().getTime() - dataObj.time > 1000 * 60 * 60 * 4) {
			localStorage.removeItem(key);
		} else {
			var dataObjDatatoJson = JSON.parse(dataObj.data)
			return dataObjDatatoJson;
		}
	}

}