localStorage polyfill (non persistent)

localstorage-poly.js

try {
  window.localStorage.setItem('testKey', '1');
  window.localStorage.removeItem('testKey');
}
catch (error) {
  window.localStorage = {
    _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 = {}; }
  };
}