git clone https://gitee.com/wjj0720/react-demo.git
 cd react-demo
 yarn
 yarn start

yarn build

 +node_modules
 -src
  +asset
  +Layout
  +pages
  +redux
  +utils
  +app.js
  +index.html
  +index.js
 .babelrc 
 package.json 
 postcss.config.js
 webpack.config.js //webpack 配置

 // webpack.config.js 配置
 module: {
  rules: [
   {
    test: /\.bundle\.js$/,
    use: {
     loader: 'bundle-loader',
     options: {
      name: '[name]',
      lazy: true
     }
    }
   }
  ]
 }
 // 頁面引入組件
 import Home from "bundle-loader?lazy&name=[name]!./Home";

 // 組件使用 因?yàn)榻M件懶加載 是通過異步的形式引入 所以不能再頁面直接以標(biāo)簽的形式使用 需要做使用封裝 
 import React, {Component} from 'react'
 import { withRouter } from 'react-router-dom'
 class LazyLoad extends Component {
  state = {
   LoadOver: null
  }
  componentWillMount() {
   this.props.Loading(c => {
    this.setState({
     LoadOver: withRouter(c.default)
    })
   })
  }
 
  render() {
   let {LoadOver} = this.state;
   return (
    LoadOver ? <LoadOver/> : <div>加載動(dòng)畫</div>
   )
  }
 }
 export default LazyLoad

 // 通過封裝的懶加載組件過度 增加加載動(dòng)畫
 <LazyLoad Loading={Home} />

 // 通過require.context讀取模塊下路由文件
 const files = require.context('./pages', true, /route\.js$/)
 let routers = files.keys().reduce((routers, route) => {
  let router = files(route).default
  return routers.concat(router)
 }, [])

 // 模塊路由文件格式
 import User from "bundle-loader?lazy&name=[name]!./User";
 export default [
  {
   path: '/user',
   component: User
  },
  {
   path: '/user/:id',
   component: User
  }
 ]

 // ---------創(chuàng)建 --------
 // 為了不免action、reducer 在不同文件 來回切換 對(duì)象的形式創(chuàng)建

 // createReducer 將書寫格式創(chuàng)建成rudex認(rèn)識(shí)的reducer
 export function createReducer({state: initState, reducer}) {
  return (state = initState, action) => {
   return reducer.hasOwnProperty(action.type) ? reducer[action.type](state, action) : state
  }
 }

 // 創(chuàng)建頁面級(jí)別的store
 const User_Info_fetch_Memo = 'User_Info_fetch_Memo'
 const store = {
  // 初始化數(shù)據(jù)
  state: {
   memo: 9,
   test: 0
  },
  action: {
   async fetchMemo (params) {
    return {
     type: User_Info_fetch_Memo,
     callAPI: {url: 'http://stage-mapi.yimifudao.com/statistics/cc/kpi', params, config: {}},
     payload: params
    }
   },
   ...
  },
  reducer: {
   [User_Info_fetch_Memo] (prevState = {}, {payload}) {
    console.log('reducer--->',payload)
    return {
     ...prevState,
     memo: payload.memo
    }
   },
   ...
  }
 }

 export default createReducer(store)
 export const action = store.action

 // 最終在模塊界別組合 [當(dāng)然模塊也有公共的數(shù)據(jù)(見Home模塊下的demo寫法)]
 import {combineReducers} from 'redux'
 import info from './Info/store'
 export default combineReducers({
  info,
  。。。
 })

 // 最終rudex文件夾下的store.js 會(huì)去取所有模塊下的store.js 組成一個(gè)大的store也就是我們最終倉庫

 // --------使用------
 // 首先在app.js中將store和app關(guān)聯(lián)
 import { createStore } from 'redux'
 import { Provider } from 'react-redux'
 // reducer即我們最終
 import reducer from './redux/store.js'
 // 用戶異步action的中間件
 import middleware from './utils/middleware.js'
 let store = createStore(reducer, middleware)
 <Provider store={store}>
  。。。
 </Provider>


 // 然后組件調(diào)用 只需要在組件導(dǎo)出時(shí)候 使用connent鏈接即可
 import React, {Component} from 'react'
 import {connect} from 'react-redux'
 // 從頁面級(jí)別的store中導(dǎo)出action
 import {action} from './store'

 class Demo extends Component {
  const handle = () => {
   // 觸發(fā)action
   this.props.dispatch(action.fetchMemo({}))
  }
  render () {
   console.log(this.props.test)
   return <div onClick={this.handle}>ss</div>
  }
 }
 export default connect(state => ({
  test: state.user.memo.test
 }) )(demo) 

 // 與其說redux中間件不如說action中間件
 // 中間件執(zhí)行時(shí)機(jī) 即每個(gè)action觸發(fā)之前執(zhí)行

 // 
 import { applyMiddleware } from 'redux'
 import fetchProxy from './fetchProxy';

 // 中間件 是三個(gè)嵌套的函數(shù) 第一個(gè)入?yún)檎麄€(gè)store 第二個(gè)為store.dispatch 第三個(gè)為本次觸發(fā)的action 
 // 簡單封裝的中間件 沒有對(duì)請(qǐng)求失敗做過多處理 目的在與項(xiàng)錯(cuò)誤處理機(jī)制給到頁面處理
 const middleware = ({getState}) => next => async action => {
  // 此時(shí)的aciton還沒有被執(zhí)行 
  const {type, callAPI, payload} = await action
  // 沒有異步請(qǐng)求直接返回action
  if (!callAPI) return next({type, payload})
  // 請(qǐng)求數(shù)據(jù)
  const res = await fetchProxy(callAPI)
  // 請(qǐng)求數(shù)據(jù)失敗 提示
  if (res.status !== 200) return console.log('網(wǎng)絡(luò)錯(cuò)誤！')
  // 請(qǐng)求成功 返回data
  return next({type, payload: res.data})
 }
 export default applyMiddleware(middleware)