A simple storage object in JavaScript using localStorage.

storage.js

var Storage = {
	_cache: {},

	get: function (key) {
		if (!this._cache[key]) {
			this._cache[key] = localStorage[key];
		}
		return this._cache[key];
	},

	set: function (key, value) {
		this._cache[key] = value;
	},

	sync: function () {
		for (var key in this._cache) {
			if (this._cache.hasOwnProperty(key)) {
				localStorage[key] = this._cache[key];
			}
		}
	}
}

Usage

• Storage.get(key) - Return the saved item by key.
• Storage.set(key, value) - Saved an item by key.
• Storage.sync() - Sync all new data to localStorage. Do not use this method during gameplay.