React低配版环境，可作为React相关测试的基础环境，方便快速测试。
git clone git@github.com:whosMeya/simple-react-app.git
git checkout v1.0.0
GitHub地址: simple-react-app v1.0.0
项目搭建过程如下
项目初始化
# 新建文件夹
mkdir simple-react-app
# 进入文件夹
cd ./simple-react-app
# npm初始化 -y参数表示使用默认配置，执行后会生成package.json文件
npm init -y
添加React代码
安装React相关依赖
npm install --save react react-dom @types/react @types/react-dom
新建index.js文件，并写入下面代码
import React from 'react';
import ReactDOM from 'react-dom';
class App extends React.Component {
render() {
return (
<div>Hello World!</div>
)
}
}
ReactDOM.render(
<App />,
document.getElementById('root')
);
新建index.html文件，并写入下面代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Simple React App</title>
</head>
<body>
<div id="root"></div>
</body>
<script src="./index.js"></script>
</html>
配置
安装webpack相关依赖
npm install --save-dev webpack webpack-cli
添加webpack配置文件
根目录新建文件 webpack.config.js，并写入下面代码
const path = require('path');
let config = {
entry: './index.js',
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'index.js'
},
}
module.exports = config;
添加插件html-webpack-plugin
html-webpack-plugin用于打包html文件。
安装
npm install --save-dev html-webpack-plugin
修改 webpack.config.js
const path = require('path');
+ const HtmlWebpackPlugin = require('html-webpack-plugin');
let config = {
entry: './index.js',
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'index.js'
},
+ plugins: [
+ new HtmlWebpackPlugin({
+ filename: 'index.html',
+ template: 'index.html',
+ }),
+ ],
}
module.exports = config;
安装Babel相关依赖
Babel将React jsx语法编译为浏览器识别的语法。
ps: Babel7将所有包放在了@babel/ 下。
npm install --save-dev babel-loader @babel/core @babel/preset-env @babel/polyfill @babel/preset-react @babel/plugin-proposal-class-properties
添加Babel配置文件
根目录新建文件 babel.config.json，并写入下面代码
{
"presets": [
"@babel/preset-env",
"@babel/preset-react"
],
"plugins": [
"@babel/plugin-proposal-class-properties"
]
}
webpack配置文件中添加Babel配置
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
let config = {
entry: './index.js',
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'index.js'
},
+ module: {
+ rules: [
+ { test: /.js$/, use: 'babel-loader' }
+ ]
+ },
plugins: [
new HtmlWebpackPlugin({
filename: 'index.html',
template: 'index.html',
}),
],
}
module.exports = config;
添加build命令
修改package.json
"scripts": {
+ "build": "webpack --mode production",
"test": "echo "Error: no test specified" && exit 1"
},
运行build命令看看效果
npm run build
打包成功，根目录会生成 dist。
打开dist下index.html，会看到 Hello World!
添加start命令
使用 webpack-dev-server 热启动。
npm install --save-dev webpack-dev-server
修改 package.json
"scripts": {
"build": "webpack --mode production",
+ "start": "webpack-dev-server",
"test": "echo "Error: no test specified" && exit 1"
},
运行start命令看看效果
npm run start
项目运行成功，打开 http://localhost:8080/ 会看到 Hello World!
修改index.js, 保存后页面也会同步刷新。