webpack2+React 实例demo

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园中桥
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    1.目录结构

    源文件在src目录下，打包后的文件在dist目录下。

    clipboard.png

    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;
}
    webpack2react
    园中桥
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