[ruslan_mart]

pepel266, лучше так:

function storageObject(itemName) {
	var object = window.localStorage.getItem(itemName);
	this.itemName = itemName;
	this.data = object ? JSON.parse(object) : {};
};
storageObject.prototype.remove = function() {
	window.localStorage.removeItem(this.itemName);
};
storageObject.prototype.save = function() {
	window.localStorage.setItem(this.itemName, JSON.stringify(this.data));
};




var base = new storageObject('base');

base.data.foo = 'bar';
base.data.one = 'two';
base.data.bla = {};

base.save();