Replace the current state with the state provided, if the noEvent is true it will not emit a change event to the listeners.
Calls to setState and replaceState emit a change event that notifies listeners, only if the state has been changed by the call.
fluxapp.registerStore('user', {
actions: {
onUserLogout: 'user.logout',
},
onUserLogout: function() {
this.replaceState({});
}
});
On to getState()