Methods to build react project framework based on webpack4

This article mainly introduces the method of building a react project framework based on webpack4. The content is quite good. I will share it with you now and give it as a reference.

Introduction

Introduction to the framework, a react single-page application built using webpac, integrating antd. Use webpack-dev-server to start local services and add hot updates to facilitate development and debugging. Use bundle-loader for code cutting and lazy loading

Manually built, without using cli, a large number of comments are suitable for beginners to understand and learn webpack, and have an in-depth understanding of react projects

Start

##

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

##Package

yarn build

Directory structure

 +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

bundle-loader lazy loading usage

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

 // 组件使用 因为组件懒加载 是通过异步的形式引入 所以不能再页面直接以标签的形式使用 需要做使用封装 
 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/> : <p>加载动画</p>
   )
  }
 }
 export default LazyLoad

 // 通过封装的懒加载组件过度 增加加载动画
 <LazyLoad Loading={Home} />

Routing configuration

The framework is divided according to modules, and there is route.js under the pages folder That is a module

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

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

redux usage introduction

##

 // ---------创建 --------
 // 为了不免action、reducer 在不同文件 来回切换 对象的形式创建

 // createReducer 将书写格式创建成rudex认识的reducer
 export function createReducer({state: initState, reducer}) {
  return (state = initState, action) => {
   return reducer.hasOwnProperty(action.type) ? reducer[action.type](state, action) : state
  }
 }

 // 创建页面级别的store
 const User_Info_fetch_Memo = 'User_Info_fetch_Memo'
 const store = {
  // 初始化数据
  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

 // 最终在模块界别组合 [当然模块也有公共的数据(见Home模块下的demo写法)]
 import {combineReducers} from 'redux'
 import info from './Info/store'
 export default combineReducers({
  info,
  。。。
 })

 // 最终rudex文件夹下的store.js 会去取所有模块下的store.js 组成一个大的store也就是我们最终仓库

 // --------使用------
 // 首先在app.js中将store和app关联
 import { createStore } from 'redux'
 import { Provider } from 'react-redux'
 // reducer即我们最终
 import reducer from './redux/store.js'
 // 用户异步action的中间件
 import middleware from './utils/middleware.js'
 let store = createStore(reducer, middleware)
 <Provider store={store}>
  。。。
 </Provider>


 // 然后组件调用 只需要在组件导出时候 使用connent链接即可
 import React, {Component} from &#39;react&#39;
 import {connect} from &#39;react-redux&#39;
 // 从页面级别的store中导出action
 import {action} from &#39;./store&#39;

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

About redux middleware

 // 与其说redux中间件不如说action中间件
 // 中间件执行时机 即每个action触发之前执行

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

 // 中间件 是三个嵌套的函数 第一个入参为整个store 第二个为store.dispatch 第三个为本次触发的action 
 // 简单封装的中间件 没有对请求失败做过多处理 目的在与项错误处理机制给到页面处理
 const middleware = ({getState}) => next => async action => {
  // 此时的aciton还没有被执行 
  const {type, callAPI, payload} = await action
  // 没有异步请求直接返回action
  if (!callAPI) return next({type, payload})
  // 请求数据
  const res = await fetchProxy(callAPI)
  // 请求数据失败 提示
  if (res.status !== 200) return console.log('网络错误！')
  // 请求成功 返回data
  return next({type, payload: res.data})
 }
 export default applyMiddleware(middleware)

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