localStorage For Everybody

localStorage.js

// localStorage For Everybody (but namely old ie)
!this.localStorage && ('addBehavior' in document.documentElement) && (this.localStorage = (function (glo) {
	var localStorageElement = document.appendChild(document.createElement('x-local-storage'));
	var localStorageKey = 'localStorage';
	var localStorageDataPrefix = 'data-';

	localStorageElement.addBehavior('#default#userData');

	localStorageElement.load(localStorageKey);

	var attrs = localStorageElement.getAttribute(localStorageKey) || '';

	return {
		getItem: function (key) {
			key = escape(key);
			return localStorageElement.getAttribute(localStorageDataPrefix + key);
		},
		setItem: function (key, value) {
			key = escape(key);

			localStorageElement.setAttribute(localStorageKey, attrs += ' ' + key + ' ');
			localStorageElement.setAttribute(localStorageDataPrefix + key, value);

			localStorageElement.save(localStorageKey);
		},
		removeItem: function (key) {
			key = escape(key);

			localStorageElement.setAttribute(localStorageKey, attrs = attrs.replace(' ' + key + ' ', ''));
			localStorageElement.removeAttribute(localStorageDataPrefix + key);

			localStorageElement.save(localStorageKey);
		},
		clear: function () {
			localStorageElement.expires = (new Date()).toUTCString();

			for (var a = localStorageElement.getAttribute(localStorageKey).split(' '), l = a.length, i = 0; i < l; ++i) {
				localStorageElement.removeAttribute(localStorageDataPrefix + a[i]);
			}

			localStorageElement.save(localStorageKey);

			return;
		}
	};
})(this));