react redux 使用

详情可查看github dome 演示文件   https://github.com/fuyunchun/react-redux-demo.git

index.js 入口文件

import React from 'react';
import ReactDOM from 'react-dom';
import App from './app'
import {Provider} from 'react-redux' 
import {createStore,applyMiddleware} from 'redux'
import {BrowserRouter} from 'react-router-dom'
import thunk from 'redux-thunk'; //处理异步的中间件，（和applyMiddleware一起使用）
import reducer from './reducer'

const store = createStore(reducer,applyMiddleware(thunk))

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

app.js自定义组件

import React from 'react'
import {Link , Route} from 'react-router-dom'
import {connect} from 'react-redux'
import {ADD,REMOVE,ASYNC} from './counder'

function kehuan(){
    return <h1>《科幻类图书》</h1>
}

function xiaoshui(){
    return <h1>《小说类图书》</h1>
}

// 使用 @connect 需要安装redux装饰器，详情见下
https://www.cnblogs.com/tlfe/p/13930332.html

@connect(
    // state => ({num:state}), 没有合并reducer之前这么用
    state => ({num:state.counder}),
    {ADD,REMOVE,ASYNC}
)

class App extends React.Component{
    render(){
        return (
            <div>
                <ul>
                    <li>
                        <Link to="/">科幻类图书</Link>
                    </li>
                    <li>
                        <Link to="/xiaoshui">小说类图书</Link>
                    </li>
                </ul>
                <Route path="/" exact component={kehuan}></Route>
                <Route path="/xiaoshui" component={xiaoshui}></Route>
                <div>还剩{this.props.num}本图书</div>
                <button onClick={this.props.ADD.bind(this)}>申请图书</button>
                <button onClick={this.props.REMOVE.bind(this)}>上交图书</button>
                <button onClick={this.props.ASYNC}>缓两天在交</button>
            </div>
        )
    }
}

export default App

counder.js 文件

const add = '申请图书'
const remove = '上交图书'

function counder(state=0,action){
    switch(action.type){
        case add : return state + 1
        case remove : return state - 1
        default : return 10
    }
}

function ADD(){
    return {type:add}
}

function REMOVE(){
    return {type:remove}
}

// 处理异步的
function ASYNC(){
    return dispatch => {
        setTimeout(() => {
            dispatch(REMOVE())
        },2000)
    }
}

export {
    counder,
    ADD,
    REMOVE,
    ASYNC
}

reducer.js 合并多个reducer

// 合并多个 reducer

import {combineReducers} from 'redux'

import {counder} from './counder'  

// 有多少个直接在下面加
export default combineReducers({
    counder
})