详解webpack2+React 实例demo

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

<!doctype html>
<html lang="en">
 <head>
  <meta charset="utf-8">
  <title>React Project</title>
 </head>
 <body>
  <div id="content"></div>

  <script src="app.bundle.js"></script>
 </body>
</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(<Demo1 title="这是提示" />, $('#content')[0]);
// render(<Demo2 myName="园中桥" sex="female"/>, $('#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。

<!doctype html>
<html lang="en">
 <head>
  <meta charset="utf-8">
  <title>Template Index html</title>
 </head>
 <body>
  <div id="content"></div>
 </body>
</html>

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 <li key={index}>name:{item.name},tel:{item.tel}</li>
      })
  }

  render(){
    let btnStyle = {
      border: '1px solid #ccc',
      background:'#fff',
      color: '#a106ce'
    }
    return (
        /* 注释 */
        <div>
          <button style={btnStyle} className="btn" type="button" onClick={()=>this.handleClick()}>change state</button><br/>
          <p title={this.props.title} style={{ color:'#A349A4' }}>Hello { this.props.textCont}!</p>
          <p>{this.state.content ? 'initial value' : 'later value'}</p>
          { /* 标签里面的注释外面要用花括号 */ }
          <input type="text" value={this.state.value} ref="myInput" onChange={this.handleChange.bind(this)} />
          <h4>{this.state.value}</h4>
          <DemoChild><p>lalala</p></DemoChild>
          <ul>
            { this.renderArr() }
          </ul>
        </div>
      )
  }
}

Demo1.propTypes = {
  title: React.PropTypes.string.isRequired
}
Demo1.defaultProps = {
  textCont: 'React'
}

class DemoChild extends React.Component {
  constructor(props) {
    super(props);
  }

  render(){
    return (
        <div>我是子组件{this.props.children}</div>
      )
  }
}

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 (
    <div>
      <p className="colorStyle">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 onClick={ this.doUpdateCount.bind(this) } style={{ padding: 5,backgroundColor: '#ccc' }}>点我开始计数</button>
      <SubMyPropType count1={this.state.count} />
    </div>
    )
  }
}

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;
}

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