(function(window, undefined){  function userData(){    var doc = document;    var name = location.host || ‘localhost‘;    var store = doc.createElement(‘div‘);    var expires = new Date();    var keys = [];    store.style.display = ‘none‘;    store.style.behavior = ‘url("#default#userData")‘;    doc.body.appendChild(store);    expires.setDate(expires.getDate()+365);    store.expires = expires.toUTCString();    store.load(name);    function getItem(key){      return store.getAttribute(key);    }    function setItem(key, val){      store.setAttribute(key, val);      store.save(name);      return this;    }    function removeItem(key){      store.removeAttribute(key);      store.save(name);      return this;    }    return {      length: length,      getItem: getItem,      setItem: setItem,      removeItem: removeItem    }  }  function winLocalStorage(store){    function getItem(key){      return store.getItem(key);    }    function setItem(key,val){      store.setItem(key, val);      return store;    }    function removeItem(key){      store.removeItem(key);      return store;    }    return {      getItem: getItem,      setItem: setItem,      removeItem: removeItem    }  }    window.LocalStorage = window.localStorage && (new winLocalStorage(window.localStorage)) || new userData();})(window)alert(LocalStorage.setItem(‘aa‘, 123).getItem(‘aa‘));