详解webpack2+React 实例demo

本篇文章主要介绍了详解webpack2+React 实例demo，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧

1.目录结构

源文件在src目录下，打包后的文件在dist目录下。

2.webpack.config.js

说明：

1.涉及到的插件需要npm install安装；
2.html-webpack-plugin创建服务于 webpack bundle 的 HTML 文件；
3.clean-webpack-plugin清除dist目录重复的文件；
4.extract-text-webpack-plugin分离css文件。

 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.新建.babelrc

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

5.index.html

6.package.json

npm install 或 yarn -> 安装模块，npm run build -> 打包，npm start -> 启动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:入口文件

 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(, $('#content')[0]); // render(, $('#content')[0]); 

8.templateIndex.html

打包后的模板index文件，插件html-webpack-plugin的template指定的目录。

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:父子组件生命周期

 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 (  
姓名：{this.props.myName}
问候：{this.state.stateName}
年龄：{this.props.age}
性别：{this.props.sex}
父元素计数是:{this.state.count}
点我开始计数 ) } } 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( 
子元素计数是:{this.props.count1}
 ) } } 

demo2.css

 .colorStyle { color: #0f0; }

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