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react-demo-2's Introduction

文件夹说明

一步一步讲解react+webpack的配置(demo01)

看了很多博客，大都是把配置文件一笔带过，或者干脆不给出配置文件，然而环境搭建对于新手来说是既困难又重要，显然网络上的博客不利于新手开始学习。 BZ打算从从头开始，一步一步配置webpack，能够使用ES6+React组合开发，废话少说让我们一起来开始Webpack+ES6+React之旅。

可以在我的github 中clone或者fork https://github.com/zrysmt/react-demo

当然你也可以使用本博文最后总结的部分或者从我的github中获得，全部安装插件npm install,然后执行webpack就可以编译了。

  • 使用命令npm init新建包管理文件
  • 安装webpack ，npm i --save-dev [email protected]，注意：这里用的版本是1.x（@1.13.3）版本的。忽略（@1.13.3）直接下载的会是新版本的，写法会有些改变；
  • 在项目根目录下新增webpack.config.js文件，它的基本结构是：
var webpack = require('webpack');
module.exports = {
entry:{
page: "./src/app.js"
},
    output: {
        path: './build',
        filename: "bundle.js"
    },
    module: {
        loaders: [
            {test:/\.js$/,exclude: /node_modules/,loader:''},//加载器在这里
//下面我们会在这里增加
        ]
    }
};

1.支持es6

 npm i --save-dev babel-core babel-loader babel-preset-es2015

webpack.config.js

{ test: /\.js$/, exclude: /node_modules/, loader: 'babel-loader' }

.babelrc

{
  "presets": [
    "es2015"
  ]
}

入口app.js,es6语法

var p = require("./es6test/es6test1.js")
//es6test1.js
import Point from './es6test2';
let p = new Point(1,2);
console.log(p.toString()); 
//es6test2.js
class Point {
  constructor(x, y) {
    this.x = x;
    this.y = y;
  }


  toString() {
    return '(' + this.x + ', ' + this.y + ')';
  }
}
export default Point;

2. 支持React语法

{test:/\.jsx$/,exclude: /node_modules/,loader:'jsx-loader?harmony'}

入口文件app.js

var React = require('react');
var ReactDOM = require('react-dom');


var HelloMessage = React.createClass({
   render: function() {
     return <h1>Hello {this.props.name}</h1>;
  }
});


ReactDOM.render( <HelloMessage name="John" />,
   document.getElementById('example')
);

3. React和es6同时支持

  • 安装
 npm i --save-dev babel-preset-react

注意：.babelrc文件和上面的是一样也是必须的。 webpack.config.js

{test:/\.jsx?$/,exclude: /node_modules/,loader: 'babel', query: {presets: ['es2015', 'react']}},
//同时支持es6 react 或者下面的写法都可以
{test:/\.jsx?$/,exclude: /node_modules/,loader:'babel?presets[]=react,presets[]=es2015'},
//同时支持es6 react

使用React，es6语法

import React from 'react';
import ReactDOM from 'react-dom';


class HelloMessage extends React.Component {
    render() {
        return <h1> Hello { this.props.name } </h1>;
    }
}
ReactDOM.render( <HelloMessage name="zry" />,
   document.getElementById('example')
);

4. 其余配置

css/sass

  • 安装
npm i --save-dev  style-loader  css-loader sass-loader  node-sass
  • webpack.config.js
{ test: /\.css$/, loader: "style!css" },
{ test: /\.scss$/, loader: "style!css!sass" }, //sass加载器

使用很简单

import "./home/home.css";
import "./home/home.scss";

css文件可以独立出来

npm i --save-dev extract-text-webpack-plugin

配置

/*下面两行的作用是分离css*/
{ test: /\.css$/, loader:ExtractTextPlugin.extract("style-loader", "css-loader") },
{ test: /\.scss$/, loader:ExtractTextPlugin.extract("style-loader", "css-loader!sass-loader") }, //sass

图片加载

npm i --save-dev  url-loader

配置webpack.config.js

{test: /\.(png|jpg)$/,
    exclude: /node_modules/,
    loader: 'url?limit=8192'}

意思是大于8192kb的图片会以base64的形式加载

使用：

<img src={require("./imgs/rect.png")}/>
//或者在css中直接使用
background: url(imgs/toolbar.png) no-repeat;

path路径管理

有时候在配置文件中经常会用到路径管理

npm i --save-dev path

在配置文件中

var path = require('path');

output: {
    path: path.resolve(__dirname, 'output'),
  },

5. 基本功能配置总结：

package.json

{
  "name": "react-demo",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "webpack-dev-server --hot --progress --colors",
    "build": "webpack --progress --colors"
  },
  "repository": {
    "type": "git",
    "url": "zry"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "babel-core": "^6.18.0",
    "babel-loader": "^6.2.7",
    "babel-preset-es2015": "^6.18.0",
    "babel-preset-react": "^6.16.0",
    "css-loader": "^0.25.0",
    "jsx-loader": "^0.13.2",
    "node-sass": "^3.10.1",
    "react": "^15.3.2",
    "react-dom": "^15.3.2",
    "sass-loader": "^4.0.2",
    "style-loader": "^0.13.1",
    "webpack": "^1.13.3"
  }
}

webpack.config.js

var webpack = require('webpack');


module.exports = {
entry:{
page: "./src/app.js"
},
    output: {
        path: './build',
        filename: "bundle.js"
    },
    module: {
        loaders: [
            // { test: /\.js$/, exclude: /node_modules/, loader: 'babel-loader' },//支持es6
            // {test:/\.jsx?$/,exclude: /node_modules/,loader:'jsx-loader?harmony'},//支持react
            // {test:/\.jsx?$/,exclude: /node_modules/,loader:'babel?presets[]=react,presets[]=es2015'},//同时支持es6 react或者
            {test:/\.jsx?$/,exclude: /node_modules/,loader: 'babel', query: {presets: ['es2015', 'react']}},//同时支持es6 react
            {test: /\.(png|jpg)$/, exclude: /node_modules/, loader: 'url?limit=8192'},
            /*下面两行的作用是分离css*/
            /*{ test: /\.css$/, loader:ExtractTextPlugin.extract("style-loader", "css-loader") },
             { test: /\.scss$/, loader:ExtractTextPlugin.extract("style-loader", "css-loader!sass-loader") }, //sass加载器*/
            { test: /\.css$/, loader: "style!css" },
            { test: /\.scss$/, loader: "style!css!sass" }, //sass加载器
        ]
    },
    resolve: {
        extensions: ['', '.js', '.json']
    },
    plugins: [
      // new ExtractTextPlugin("output/[name].css"),//独立css文件
        new webpack.NoErrorsPlugin()
    ],
    devtool: 'source-map'
};

别忘了.babelrc文件

{
  "presets": [
    "es2015"
  ]
}

6. React支持热插拔

webpack-dev-server支持热插拔（热替换 HRM），使用HRM功能也有两种方式：命令行方式(推荐)和Node.js API 方式。

6.1 Node.js API方式

Node.js API方式需要做三个配置：

  1. 把webpack/hot/dev-server加入到webpack配置文件的entry项；
  2. 把new webpack.HotModuleReplacementPlugin()加入到webpack配置文件的plugins项；
  3. 把hot:true加入到webpack-dev-server的配置项里面。

使用 react 编写代码时，能让修改的部分自动刷新。但这和自动刷新网页是不同的，因为 hot-loader 并不会刷新网页，而仅仅是替换你修改的部分

  • 安装
npm i --save-dev react-hot-loader webpack-dev-server
  • 修改.babelrc
{
  "presets": [
    "es2015"
  ],
  "plugins":["react-hot-loader/babel"]
}
  • 修改webpack.config.js
var webpack = require('webpack');
module.exports = {
    //修改：entry
    entry: [
        "webpack-dev-server/client?http://127.0.0.1:3000",
        "webpack/hot/only-dev-server",
        "./src/app.js"
    ],
//修改：output
    output: {
        path: __dirname,
        filename: "build/bundle.js",
        publicPath: "/build"
    },
    module: {
        loaders: [
            { test: /\.jsx?$/, exclude: /node_modules/, loader: 'babel', query: { presets: ['es2015', 'react'] } }, //同时支持es6 react
            {test: /\.(png|jpg)$/, exclude: /node_modules/, loader: 'url?limit=8192'},
            /*下面两行的作用是分离css*/
            /*{ test: /\.css$/, loader:ExtractTextPlugin.extract("style-loader", "css-loader") },
             { test: /\.scss$/, loader:ExtractTextPlugin.extract("style-loader", "css-loader!sass-loader") }, //sass加载器*/
            { test: /\.css$/, loader: "style!css" },
            { test: /\.scss$/, loader: "style!css!sass" }, //sass加载器
        ]
    },
    resolve: {
        extensions: ['', '.js', '.json']
    },
    plugins: [
      // new ExtractTextPlugin("output/[name].css"),//独立css文件
        new webpack.NoErrorsPlugin(), //允许错误不打断程序
        new webpack.HotModuleReplacementPlugin() //增加：webpack热替换插件
    ],
    devtool: 'source-map'
};
  • 增加server.js文件
var webpack = require('webpack');
var WebpackDevServer = require('webpack-dev-server');
var config = require('./webpack.config');


new WebpackDevServer(webpack(config), {
    publicPath: config.output.publicPath,
    hot: true,
    historyApiFallback: true
}).listen(3000, 'localhost', function(err, result) {
    if (err) {
        return console.log(err);
    }
    console.log('Listening at http://localhost:3000/')
});

如何使用？--在命令行中

webpack &
node server.js  //启动node服务

在浏览器输入localhost:3000即可查看结果，我们修改css文件，保存之后网页会自动刷新显示在浏览器上。js文件修改需要手动刷新一次。

6.2 命令行方式

命令行方式比较简单，需要加入--inline --hot。 例子位置在我的github。

https://github.com/zrysmt/react-demo/tree/master/demo03

这个例子中执行的命令是：

SET DEBUG=true && webpack-dev-server --history-api-fallback --progress --profile --inline --colors --hot --port 8080 --open

指定端口8080，可以是其它的没有被占用过的任意端口。

具体配置项也有所改变

var webpack = require('webpack');
var path = require('path');
var HtmlwebpackPlugin = require('html-webpack-plugin');

// 定义当前是否处于开发debug阶段
var isDebug = JSON.stringify(JSON.parse(process.env.DEBUG || 'false'));

// 根据isDebug变量定义相关config变量
var configVarObj = {};
if(isDebug === 'true') {
    console.log('I am in debuging............');
    configVarObj = {
        htmlPath: 'index.html',  // 定义输出html文件路径
        // devtool: 'cheap-source-map' // 生成sourcemap,便于开发调试
        devtool: 'eval' // 生成sourcemap,便于开发调试
    };
} else {
    console.log('I am in releasing............');
    configVarObj = {
        htmlPath: /*cjebTemplateFolder + */'/index.html',  // 定义输出html文件路径
        devtool: ''
    };
}

module.exports = {
    context: path.join(__dirname, 'src'),
    entry:  {
        app:"./app.js",
        vendors: [
          'jquery'
        ]
    },
    output: {
        path: path.resolve(__dirname, 'output'),
        // 输出文件名
        filename: 'js'+'/[name].min.js?[hash]',
        // cmd、amd异步加载脚本配置名称
        chunkFilename: 'js'+'/[name].chunk.js?[hash]',
        publicPath: ''
    },
    module: {
        loaders: [
            { test: /\.jsx?$/, exclude: /node_modules/, loader: 'babel', query: { presets: ['es2015', 'react'] } }, //同时支持es6 react
            { test: /\.css$/, loader: "style!css" },
            { test: /\.scss$/, loader: "style!css!sass" }, //sass加载器
        ]
    },
    resolve: {
        extensions: ['', '.js', '.jsx','.json']
    },
    devtool: configVarObj.devtool,
    plugins: [
        new HtmlwebpackPlugin({
            title: 'test',
            template: path.join(__dirname, './index.html'),
            filename: 'index.html',
            minify: {
                minifyJS: true,
                removeComments: true,
                minifyCSS: true
            },
        }),
        new webpack.optimize.UglifyJsPlugin({
            compress: {
                warnings: false
            }
        }),
        //定义全局变量
        new webpack.DefinePlugin({
            __DEV__: isDebug 
        })
    ]
};

可以在我的github https://github.com/zrysmt/react-demo中clone或者fork

参考阅读：

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