使用 Parcel 打包的 React HelloWorld 应用。GitHub 地址: https://github.com/justjavac/...
0. 新建目录
mkdir react-helloworld
cd react-helloworld
1. 初始化 npm
yarn init -y
或
npm init -y
此时会创建要给 package.json 文件，文件内容：
{
"name": "parcel-example-react-helloworld",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC"
}2. 添加 React
yarn：
yarn add react react-dom
npm:
npm install react react-dom --save
package.json 文件内容：
{
"name": "parcel-example-react-helloworld",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
- "license": "ISC"
+ "license": "ISC",
+ "dependencies": {
+ "react": "^16.2.0",
+ "react-dom": "^16.2.0"
+ }
}3. 添加 Babel
新建 .babelrc 文件
touch .babelrc
输入内容：
{
"presets": ["react"]
}添加 babel-preset-react：
yarn：
yarn add babel-preset-react -D
npm:
npm install babel-preset-react --D
此时 package.json 文件内容：
{
"name": "parcel-example-react-helloworld",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"react": "^16.2.0",
"react-dom": "^16.2.0"
- }
+ },
+ "devDependencies": {
+ "babel-preset-react": "^6.24.1"
+ }
}5. 添加 Parcel
yarn：
yarn add parcel-bundler -D
npm:
npm install parcel-bundler --D
此时 package.json 文件内容：
{
"name": "parcel-example-react-helloworld",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"react": "^16.2.0",
"react-dom": "^16.2.0"
},
"devDependencies": {
- "babel-preset-react": "^6.24.1"
+ "babel-preset-react": "^6.24.1",
+ "parcel-bundler": "^1.0.3"
}
}6. 新建 index.html 文件
内容
<html>
<body>
<div id="root"></div>
<script src="./index.js"></script>
</body>
</html>7. 新建 index.js 文件
import React from "react";
import ReactDOM from "react-dom";
const App = () => {
return <h1>Hello World!</h1>;
};
ReactDOM.render(<App />, document.getElementById("root"));8. 添加打包命令
{
"name": "parcel-example-react-helloworld",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
- "test": "echo \"Error: no test specified\" && exit 1"
+ "start": "parcel index.html"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"react": "^16.2.0",
"react-dom": "^16.2.0"
},
"devDependencies": {
"babel-preset-react": "^6.24.1"
"babel-preset-react": "^6.24.1",
"parcel-bundler": "^1.0.3"
}
}9. 完成
运行
yarn start
或
npm start
在浏览器中打开 http://localhost:1234
打包过程会生产 .cache 和 dist 两个目录，如果是 git 工程，可以新建 .gitignore 文件忽略这两个目录：
.cache
dist
node_modulesGitHub 地址: https://github.com/justjavac/...
html5
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