localStorage polyfill with cookie storage

best-localStorage-polyfill-evar.js

try {
    localStorage.setItem('test', 1);
    localStorage.removeItem('test');
} catch(e) {
    window.localStorage = {
        _data       : JSON.parse(document.cookie.replace(/(?:(?:^|.*;\s*)localStorage\s*\=\s*([^;]*).*$)|^.*$/, "$1") || '{}'),
        _save       : function() { document.cookie = "localStorage=" + JSON.stringify(this._data) + "; expires=Tue, 19 Jan 2038 03:14:07 GMT; path=/"; },
        setItem     : function(id, val) { this._data[id] = String(val); this._save(); },
        getItem     : function(id) { return this._data.hasOwnProperty(id) ? this._data[id] : null; },
        removeItem  : function(id) { delete this._data[id]; this._save(); },
        clear       : function() { this._data = {}; this._save(); }
    };
}