react-redux

import React,{ Component,PropTypes } from 'react'
import ReactDOM from 'react-dom'
import { createStore } from 'redux'
import { Provider,connect } from 'react-redux'

// React component
class CounterC extends Component {
  render() {
    const { value,onIncreaseClick } = this.props
    return (
      <div>
        <span>{value}</span>
        <button onClick={onIncreaseClick}>Increase</button>
      </div>
    )
  }
}

Counter.propTypes = {
  value: PropTypes.number.isRequired,onIncreaseClick: PropTypes.func.isRequired
}

// Action
const increaseAction = { type: 'increase' }

// Reducer
function counter(state = { count: 0 },action) {
  const count = state.count
  switch (action.type) {
    case 'increase':
      return { count: count + 1 }
    default:
      return state
  }
}

// Store
const store = createStore(counter)

// Map Redux state to component props
function mapStateToProps(state) {
  return {
    value: state.count
  }
}

// Map Redux actions to component props
function mapDispatchToProps(dispatch) {
  return {
    onIncreaseClick: () => dispatch(increaseAction)
  }
}

// Connected Component
const App = connect(
  mapStateToProps,mapDispatchToProps
)(CounterC)

ReactDOM.render(
  <Provider store={store}>
    <App />
  </Provider>,document.getElementById('root')
)

（编辑：李大同）

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