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webpack学习(五)—webpack+react+es6
如果你看过webpack学习系列的前一个文章,接下来做的东西会比较简单 :webpack学习(四)— webpack-dev-server
react发展的很快,现在大部分开发react相关的项目,都会用到这个组合:webpack+react+es6
还是以一个项目举例,项目中的package.json是生成的,"devDependencies"都是自己安装加入,如果拷贝网上的资料,可以npm install直接生成。而为了一探react的具体开发流程,还是自己一个个安装比较好。
项目目录:
package.json
{ "name": "pro4", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "build": "webpack", "dev": "webpack-dev-server --inline --hot --config webpack.config.js" }, "author": "", "license": "ISC", "devDependencies": { "babel-core": "^6.18.2", "babel-loader": "^6.2.7", "babel-preset-es2015": "^6.18.0", "babel-preset-react": "^6.16.0", "css-loader": "^0.26.0", "react": "^15.4.0", "react-dom": "^15.4.0", "react-hot-loader": "^3.0.0-beta.6", "style-loader": "^0.13.1", "webpack": "^1.13.3", "webpack-dev-server": "^1.16.2" } }
index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <div id="content"></div> <script src="http://www.mamicode.com/build/bundle.js"></script> </body> </html>
webpack.config.js
var path = require("path"); module.exports = { entry:[ ‘./src/js/app.js‘ ], output: { path: path.resolve(‘./‘, "dist"), publicPath: "build", filename: "bundle.js" }, module: { loaders: [ {test: /\.js?$/, exclude: /node_modules/, loaders: [ ‘babel?presets[]=react,presets[]=es2015‘ ] }, { test: /\.css$/, loader: ‘style!css‘} ] }, resolve:{ extensions:[‘‘,‘.js‘,‘.json‘] }, };
src/js/app.js
import React from ‘react‘; import ReactDOM from ‘react-dom‘; import Helloworld from ‘./helloworld‘; // ReactDOM.render // (<Helloword/>,document.getElementById(‘content‘); // ); ReactDOM.render ( <Helloworld/>, document.getElementById(‘content‘) );
src/js/helloword.js
import React from ‘react‘; import ReactDOM from ‘react-dom‘; class Helloworld extends React.Component{ constructor(props) { super(props); } render(){ return(<h1>Hello World!!!!!!</h1>) } } module.exports = Helloworld
安装: npm init
启动:npm run dev
项目地址:http://localhost:8080/index.html
说明:
1)本文例子中package.json包含的 "devDependencies"项,是webpack+react+es6开发的最少的安装。本例热加载,修改任何一个src/js下的js文件,保存,浏览器自动更新。
2)本文例子并没有安装react-hot-loader,原因是直接安装,目前版本一到3.0以上,并不支持在webpack.config.js中这么书写:
{test: /\.js?$/, exclude: /node_modules/, loaders: [‘react-hot‘,‘babel-loader?presets[]=react,presets[]=es2015‘] },
如果写了,webpack-dev-server会报错:
Module build failed: Error: React Hot Loader: The Webpack loader is now exported separately
但是,用低版本的react-hot-loader不会报错。
而且你会发现,现在不用react-hot-loader,也可以热加载。
3)js的加载器:
{test: /\.js?$/, exclude: /node_modules/, loaders: [ ‘babel?presets[]=react,presets[]=es2015‘ ] },
这里很重要,先用babel-loader将es6(es2015),react的语法(jsx)转换为目前浏览器普遍支持的语法,即es5。
如果这里配置出错,或者没有安装除了babel外的2个loader,会报错
Module build failed: SyntaxError: Unexpected token
因为你在return里写的HTML标签不识别(不是字符串)。
4)如果要兼容老版本浏览器,支持es3语法。还需要用es3ify-loader。本例没有用。
webpack学习(五)—webpack+react+es6