react redux入门示例

create-react-app mydemo

npm run eject

npm i redux --save

const Add = 'addGirl', Remove = "removeGirl";export function reducer(state = 0, action) {  switch (action.type) {    case Add:      return state + 1;    case Remove:      return state - 1;    default:      return 10;  }}//action creator,把action封装成一个方法，这样用的时候不用每次定义，避免出错export function addCreator() {  return { type: Add };}export function removeCreator() {  return { type: Remove };}export function addAsync() {  return (dispatch, getState) => {    setTimeout(function () {      dispatch(addCreator());    }, 1000);  }}

import React from 'react';import ReactDOM from 'react-dom';import './index.css';import App from './App';import registerServiceWorker from './registerServiceWorker';import { createStore } from 'redux';import thunk from 'redux-thunk';import { reducer,addCreator,removeCreaator } from './index.redux';import { Provider } from 'react-redux'const store = createStore(reducer);function render() {  ReactDOM.render(    <App store={store} addCreator={addCreator} removeCreator={removeCreator} />,    document.getElementById('root')  );}//封装成方法，方便下面的store的订阅调用render();//每当dispatch时，订阅的函数就会执行store.subscribe(render);registerServiceWorker();

import React, { Component } from 'react';import './App.css';class App extends Component { render() {  var store=this.props.store;  var num=store.getState();  return (   <div className="App">    <h1>现在有机关枪{this.props.num}把。</h1>    <button onClick={() => { store.dispatch(this.props.addCreator()) }}>add</button>    <button onClick={() => { store.dispatch(this.props.removeCreator()) }}>remove</button>   </div >  ); }}export default App;

npm i react-thunk --save

import thunk from 'redux-thunk';const store = createStore(reducer, applyMiddleware(thunk));

export function addAsync() {  return (dispatch, getState) => {    setTimeout(function () {      dispatch(addCreator());    }, 1000);  }}

<button onClick={() => { store.dispatch(this.props.addAsync()) }}>addAsync</button>