Detailed explanation of webpack2+React usage

This time I will bring you a detailed explanation of the use of webpack2 React. What are the precautions when using webpack2 React? The following is a practical case, let’s take a look.

1. The plug-ins involved need to be installed by npm install;
2.html-webpack-plugin creates HTML files that serve the webpack bundle;
3.clean-webpack-plugin clears duplicate files in the dist directory;
4.extract-text-webpack-plugin separates css files.

var path = require('path');
var webpack = require('webpack');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var CleanWebpackPlugin = require('clean-webpack-plugin');
var ExtractTextPlugin = require("extract-text-webpack-plugin");
var UglifyJsPlugin = webpack.optimize.UglifyJsPlugin;
var config = {
 context: path.resolve(dirname, './src'),
 entry: {
  app: './main.js'
 },
 output: {
  path: path.resolve(dirname, './dist'),
  filename: '[name].bundle.js'
 },
 devtool: 'cheap-module-eval-source-map',
 module: {
  rules: [
   {
    test: /\.jsx?$/,
    exclude: /node_modules/,
    loader: 'babel-loader'
   },
   {
     test: /\.css$/,
     use: ExtractTextPlugin.extract({
      fallback: "style-loader",
      use: ["css-loader","postcss-loader"]
    })
   },
   {
    test: /\.less$/,
    use: ["style-loader","css-loader","less-loader"]
   },
   { 
     test: /\.(png|jpg)$/,
     loader: 'url-loader',
     options: {
      limit: 8129
     }
   }
  ]
 },
 devServer:{
   historyApiFallback: true,
   host:'0.0.0.0',
   hot: true, //HMR模式  
   inline: true,//实时刷新
   port: 8181 // 修改端口，一般默认是8080
 },
 resolve: {
   extensions: ['.js', '.jsx', '.css'],
   modules: [path.resolve(dirname, './src'), 'node_modules']
 },
 plugins: [ 
  new webpack.HotModuleReplacementPlugin(),
  new UglifyJsPlugin({
   sourceMap: true
  }),
  new webpack.LoaderOptionsPlugin({
   minimize: true,
   debug: true
  }),
  new HtmlWebpackPlugin({
    template:'./templateIndex.html' 
  }),
  new ExtractTextPlugin({
    filename: '[name].[hash].css',
    disable: false,
    allChunks: true,
  }),
  new CleanWebpackPlugin(['dist'])
 ],
}
module.exports = config;
// webpack里面配置的bundle.js需要手动打包才会变化,目录可以由自己指定;
// webpack-dev-server自动检测变化自动打包的是开发环境下的bundle.js,打包路径由contentBase决定,两个文件是不一样的.

3.postcss.config.js(Autoprefixer)

module.exports = {
 plugins: {
  'autoprefixer': {browsers: 'last 5 version'}
 }
}
// 兼容最新的5个浏览器版本

4.New .babelrc

{
 "presets": ['es2015','react','stage-3']
}

5.index.html

nbsp;html>

 
  <meta>
  <title>React Project</title>
 
 
  <p></p>
  <script></script>
 

6.package.json

npm install or yarn -> install the module, npm run build -> package, npm start -> start localhost:8181

{
 "name": "reactproject",
 "version": "1.0.0",
 "description": "",
 "main": "index.js",
 "dependencies": {
  "jquery": "^3.1.1",
  "react": "^15.3.2"
 },
 "devDependencies": {
  "autoprefixer": "^7.1.2",
  "babel-core": "^6.14.0",
  "babel-loader": "^6.2.5",
  "babel-plugin-syntax-async-functions": "^6.13.0",
  "babel-plugin-transform-async-to-generator": "^6.16.0",
  "babel-preset-es2015": "^6.14.0",
  "babel-preset-react": "^6.11.1",
  "babel-preset-stage-3": "^6.17.0",
  "bootstrap": "^4.0.0-alpha.2",
  "clean-webpack-plugin": "^0.1.16",
  "css-loader": "^0.25.0",
  "extract-text-webpack-plugin": "^3.0.0-rc.2",
  "file-loader": "^0.9.0",
  "html-webpack-plugin": "^2.29.0", 
  "jshint": "^2.9.3",
  "jshint-loader": "^0.8.3",
  "json-loader": "^0.5.4",
  "less": "^2.7.1",
  "less-loader": "^2.2.3",
  "moment": "^2.15.1",
  "node-sass": "^3.10.0",
  "postcss-loader": "^2.0.6", 
  "react-bootstrap": "^0.30.5",
  "react-dom": "^15.3.2",
  "sass-loader": "^4.0.2",
  "style-loader": "^0.13.1",
  "url-loader": "^0.5.7",
  "webpack": "^3.3.0",
  "webpack-dev-server": "^2.5.1"
 },
 "scripts": {
  "start": "webpack-dev-server --hot --inline --progress --colors --content-base .",
  "build": "webpack --progress --colors"
 },
 "keywords": [
  "reactcode"
 ],
 "author": "xhh",
 "license": "ISC"
}

7.main.js:Entry file

import React from 'react'
import { render } from 'react-dom';
import $ from 'jquery';
import Demo1 from './js/demo1.js';
// import Demo2 from './js/demo2.js';
render(<demo1></demo1>, $('#content')[0]);
// render(<demo2></demo2>, $('#content')[0]);

8.templateIndex.html

The packaged template index file, the directory specified by the template of the plug-in html-webpack-plugin.

nbsp;html>

 
  <meta>
  <title>Template Index html</title>
 
 
  <p></p>
 

9.demo

demo1.js

import React from 'react';
import '../css/demo1.css';
const arr = [
  {
    name:'name1',
    tel:'12343456783'
  },
  {
    name:'name2',
    tel:'12343456784'
  },
  {
    name:'name3',
    tel:'12343456785'
  }
];
export default class Demo1 extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
     content: true,
     value: 'inputText'
    };  
  }
  handleClick(){
    this.setState({
     content: !this.state.content
    })
    // this.refs.myInput.focus();
  }
  handleChange(event) {
    this.setState({value: event.target.value});
  }
  renderArr() {
    return arr.map((item,index)=>{
        return 

name:{item.name},tel:{item.tel}

      })   }   render(){     let btnStyle = {       border: '1px solid #ccc',       background:'#fff',       color: '#a106ce'     }     return (         /* 注释 */         

          this.handleClick()}>change state
          

Hello { this.props.textCont}!

          

{this.state.content ? 'initial value' : 'later value'}

          { /* 标签里面的注释外面要用花括号 */ }                       

{this.state.value}

          

lalala

          

            { this.renderArr() }           

               )   } } Demo1.propTypes = {   title: React.PropTypes.string.isRequired } Demo1.defaultProps = {   textCont: 'React' } class DemoChild extends React.Component {   constructor(props) {     super(props);   }   render(){     return (         

我是子组件{this.props.children}

      )   } }

demo1.css

ul {
  list-style: none;
  padding: 0;
  margin:0;
  display: flex;
}
.btn:focus {
  outline: none;
}

demo2.js: Parent-child componentLife cycle

import React, { Component, PropTypes } from 'react';
import '../css/demo2.css';
export default class Demo2 extends Component {
  constructor(props){
    super(props);
    this.state = {
      stateName: this.props.myName + ',你好',
      count: 0,
    }
    console.log('init-constructor');
  }
  static get defaultProps() {
    return {
      myName: "xhh",
      age: 25
    }
  }
  doUpdateCount(){
    this.setState({
      count: this.state.count+1
    })
  }
  componentWillMount() {
   console.log('componentWillMount');
  }
  componentDidMount() {
   console.log('componentDidMount')
  }
  componentWillReceiveProps(nextProps){
   console.log('componentWillReceiveProps')
  }
  shouldComponentUpdate(nextProps, nextState){
    console.log('shouldComponentUpdate');
    // return nextProps.id !== this.props.id;
    if(nextState.count > 10) return false;
    return true;
  }
  componentWillUpdate(nextProps,nextState){
    console.log('componentWillUpdate');
  }
  componentDidUpdate(prevProps, prevState){
    console.log('componentDidUpdate');
  }
  componentWillUnmount(){
    console.log('componentWillUnmount');
  }
  render(){
    console.log('render');
    return (
    <p>
      </p><p>姓名：{this.props.myName}</p>
      <p>问候：{this.state.stateName}</p>
      <p>年龄：{this.props.age}</p>
      <p>性别：{this.props.sex}</p>
      <p>父元素计数是:{this.state.count}</p>
      <button>点我开始计数</button>
      <submyproptype></submyproptype>
    
    )
  }
}
Demo2.propTypes = {
  myName: PropTypes.string,
  age: PropTypes.number,
  sex: PropTypes.string.isRequired
}
class SubMyPropType extends Component {
  componentWillMount() {
   console.log('subMyPropType-componentWillMount');
  }
  componentDidMount() {
   console.log('subMyPropType-componentDidMount')
  }
  componentWillReceiveProps(nextProps){
   console.log('subMyPropType-componentWillReceiveProps')
  }
  shouldComponentUpdate(nextProps, nextState){
    console.log('subMyPropType-shouldComponentUpdate');
    if(nextProps.count1 > 5) return false;
    return true;
  }
  componentWillUpdate(nextProps, nextState){
    console.log('subMyPropType-componentWillUpdate');
  }
  componentDidUpdate(prevProps, prevState){
    console.log('subMyPropType-componentDidUpdate');
  }
  componentWillUnmount(){
    console.log('subMyPropType-componentWillUnmount');
  }
  render(){
    console.log('subMyPropType-render');
    return(
        <p>子元素计数是:{this.props.count1}</p>
      ) 
  }
}

demo2.css

.colorStyle {
  color: #0f0;
}

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

Recommended reading:

Vue Router Vuex implements back state saving

BootStrap implements displaying progress when uploading files

The above is the detailed content of Detailed explanation of webpack2+React usage. For more information, please follow other related articles on the PHP Chinese website!