gistfile1.js

/**
 * localStorage with expire wrapper
 */
var myStorage = (function() {
	var self = {};

	/**
	 * Method unsets value in localStorage
	 */
	self.unset = function(key) {
		localStorage.removeItem(key);
	};

	/**
	 * Method gets value from localStorage
	 * @param key 
	 */
	self.get = function(key) {

		if (!localStorage[key]) {
			return null;
		}

		var object = JSON.parse(localStorage[key]);

		if (object.timestamp === null || new Date().getTime() < object.timestamp) {
			return object.value;
		} else {
			return null;
		}

	};

	/**
	 * Method sets value in local storage
	 * 
	 * @param key
	 * @param value
	 * @param expire in seconds
	 */
	self.set = function(key, value, expire) {

		var object;

		if (!expire) {
			object = {
				value : value,
				timestamp : null
			};
		} else {
			object = {
				value : value,
				timestamp : new Date().getTime() + (expire * 1000)
			};
		}

		localStorage[key] = JSON.stringify(object);
	};

	return self;
})();