const mapStateToProps = state=>{
console.log(state);  // this 'state' return undefined.
return {
loginform: state
}};

export default connect(mapStateToProps)(LoginForm)

let store = createStore(showUsername,
window.devToolsExtension && window.devToolsExtension() );

ReactDOM.render(
<Provider store={store}>
<Router history={browserHistory}>
    <Route component={AppNavBar}>
        <IndexRedirect to='/login'>
        <Route path='/login' component={LoginForm} />
    </Route>
</Router>
</Provider>
,
document.getElementById('root')
);

class LoginForm extends Component {
    ...
}

const mapStateToProps = state=>{
console.log(state);  // this 'state' return undefined.
return {
    loginform: state
}};


export default connect(mapStateToProps)(LoginForm)

export const showusername = 'showUsername';

export const showUsername =(username,index)=>{
console.log(username,index);
return{
    type:showusername,
    username,
    payload:index
}

};

const initialState = {
        username: '',
        password: '',
        submit: false,
        //request: 'self',
        showselectfield: false
    };

export default function showUsername(state = initialState, action) {
switch (action.type) {
  case type.showusername:
  return (
      Object.assign({},initialState ,{username:action.username,password:action.password})
      );

default:
  return state