window.fakeStorage = { _data: {}, setItem: function (id, val) { return this._data[id] = String(val); }, getItem: function (id) { return this._data.hasOwnProperty(id) ? this._data[id] : undefined; }, removeItem: function (id) { return delete this._data[id]; }, clear: function () { return this._data = {}; } }; function LocalStorageManager() { this.bestScoreKey = "bestScore"; this.gameStateKey = "gameState"; var supported = this.localStorageSupported(); this.storage = supported ? window.localStorage : window.fakeStorage; } LocalStorageManager.prototype.localStorageSupported = function () { var testKey = "test"; var storage = window.localStorage; try { storage.setItem(testKey, "1"); storage.removeItem(testKey); return true; } catch (error) { return false; } }; // Best score getters/setters LocalStorageManager.prototype.getBestScore = function () { return this.storage.getItem(this.bestScoreKey) || 0; }; LocalStorageManager.prototype.setBestScore = function (score) { this.storage.setItem(this.bestScoreKey, score); }; // Game state getters/setters and clearing LocalStorageManager.prototype.getGameState = function () { var stateJSON = this.storage.getItem(this.gameStateKey); return stateJSON ? JSON.parse(stateJSON) : null; }; LocalStorageManager.prototype.setGameState = function (gameState) { this.storage.setItem(this.gameStateKey, JSON.stringify(gameState)); }; LocalStorageManager.prototype.clearGameState = function () { this.storage.removeItem(this.gameStateKey); };