Hub

// Config s.t. subdomains can get, but only the root domain can set and del
CrossStorageHub.init([
  {origin: /.example.com$/,            allow: ['get']},
  {origin: /://(www.)?example.com$/, allow: ['get', 'set', 'del']}
]);

Client

var storage = new CrossStorageClient('https://store.example.com/hub.html');

storage.onConnect().then(function() {
  return storage.set('newKey', 'foobar');
}).then(function() {
  return storage.get('existingKey', 'newKey');
}).then(function(res) {
  console.log(res.length); // 2
}).catch(function(err) {
  // Handle error
});