最主要的index.js文件
import React, { Component } from ‘react’;
import ReactDOM from ‘react-dom’;
import { createStore } from ‘redux’;
import { Provider, connect } from ‘react-redux’;

//定义组件
class App extends Component{

render() {
    const {text, onChangeText, onButtonClick} = this.props;
    return (

        <div>
            <p onClick={onChangeText}> {text} </p>
            <button onClick={onButtonClick}>click me</button>
        </div>
    );
}

};

//action
const changeTextAction = { type:’CHANGE_TEXT’ };
const buttonClickAction = { type:’BUTTON_CLICK’ };
//reducer
const initialState = {
text: ‘Hello’
}
const reducer = (state = initialState, action) => {
switch (action.type) {
case ‘CHANGE_TEXT’:
return {
text: state.text==’Hello’ ? ‘world’:’Hello’
}
case ‘BUTTON_CLICK’:
return {
text: ‘Hello world’
}
default:
return initialState;
}
}

//store
let store = createStore(reducer);

//映射Redux state到组件的属性
function mapStateToProps(state) {
return { text: state.text }
}

//映射Redux actions到组件的属性
function mapDispatchToProps(dispatch){

return{
    onButtonClick:()=>dispatch(buttonClickAction),
    onChangeText:()=>dispatch(changeTextAction)
}

}

//连接组件
App = connect(mapStateToProps, mapDispatchToProps)(App)

//渲染组件
ReactDOM.render(

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

)