react redux

    

App.js
import React, { Component } from 'react';
import store from './redux';
import Com from "./com"
class App extends Component {
	constructor(props){
		super(props);
		console.log(store);
		console.log(store.getState());//获取数据
		this.save = this.save.bind(this);
		this.state = {
			message: "",
			inputValue: ""
		};
		store.subscribe(this.handleStoreChange);//监听store中的state改变
	}
	
  render() {
    return (
      <div className="App">
      	<input value = {this.inputValue} onChange={this.inputChange} />
        <button onClick={this.save}>存储state</button>
        <p>{this.state.message}</p>
        <Com />
      </div>
    );
  }
  
  save(){
  	
  	const action = {
  		type: "msg",//必须有
  		value: this.state.inputValue
  	}
  	store.dispatch(action);//改变redux/reducer.js的state
  }
  
  handleStoreChange = () => {
  	
  	this.setState((preState) => {
  		const newState = JSON.parse(JSON.stringify(preState));
  		const storeData = store.getState();
  		console.log(storeData)
  		newState.message = storeData.message;
  		return newState;
  	});
  	
  }
  
  inputChange = (e) => {
  	const value = e.target.value;
  	this.setState((preState) => {
  		const newState = JSON.parse(JSON.stringify(preState));
  		newState.inputValue = value;
  		return newState;
  	});
  }
}

export default App;

redux/index.js
import { createStore } from 'redux';
import reducer from './reducer.js';

export default createStore(reducer); 

redux/reducer.js
export default (state = {}, action) => {
	console.log(state,action);
	const newState = JSON.parse(JSON.stringify(state));
	if(action.type == "msg"){
		newState.message = action.value;
		return newState;
	}
	
	if(action.type == "msg-msg"){
		newState.message = action.value;
		return newState;
	}
	
	return newState;
}