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React 项目迁移 Webpack Babel7

不就前写了一篇 webpack 4 升级迁移 这里简单说下 React 项目的一些配置;

首先我们新建项目 react-web ,然后进入项目初始化 package.json

cd react-web && npm init  

接下来我们安装 webpack ,这里需要注意一点,是命令行已经单独提取出来了,我们不仅需要安装 webpack 还需要安装 webpack-cli

npm i webpack webpack-cli --save-dev  

接下来我们开始安装和 react 相关的依赖包;

npm i @babel/core babel-loader @babel/preset-env @babel/preset-react --save-dev  

接下来我们初始化 babel 的配置文件。

touch .babelrc  

然后把下面内容粘贴进去;

{
  "presets": ["@babel/preset-env", "@babel/preset-react"]
}

实际上 webpack 4 是可以支持无配置构建的,但是我们还是按照传统的方式写一下配置文件;我们新建 webpack.config.js

module.exports = {  
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader"
        }
      }
    ]
  }
};

接下来我们开始 做点和 React 组件相关的东西;

npm i react-dom react prop-types --save-dev  

我们在 src 下新建目录 components

我们建立一个 Header.js 和 Footer.js .

Footer.js

import React, { Component } from "react";

class Footer extends Component {  
  constructor() {
    super();
    this.state = {
      year: "2018"
    };
  }
  render() {
    return (
      <footer class="ft">
          copyright &copy {this.state.year}
      </footer>
    );
  }
}
export default Footer;  

Header.js

import React, { Component } from "react";  
import ReactDOM from "react-dom";  
class Header extends Component {  
  constructor() {
    super();
    this.state = {
      year: "2018"
    };
  }
  render() {
    return (
      <header class="hd">
          <a href="#">Logo</a>
          <ul class="pull-right">
            <li><a href="#">Home</a></li>
            <li><a href="#">Link1</a></li>
            <li><a href="#">Link2</a></li>
          </ul>
      </header>
    );
  }
}
export default Header;  

然后我们新增文件 src/index.js

import React, { Component } from "react";  
import ReactDOM from "react-dom";  
import Header from "../src/components/Header";  
import Footer from "../src/components/Footer";

class ReactApp extends Component {  
  constructor() {
    super();
  }


  render() {
    return (
        <div class="main">
            <Header></Header>
            <Footer></Footer>
        </div>
    );
  }
}

ReactDOM.render(<ReactApp />, document.getElementById('react-app'));

export default ReactApp;  

接下来我们需要预览页面,我们引入下 html-loader

npm i html-webpack-plugin html-loader --save-dev  

修改我们的 webpack 配置:

const HtmlWebPackPlugin = require("html-webpack-plugin");  
module.exports = {  
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader"
        }
      },
      {
        test: /\.html$/,
        use: [
          {
            loader: "html-loader"
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebPackPlugin({
      template: "./src/index.html",
      filename: "./index.html"
    })
  ]
};

我们在 src 下新建 index.html 然后添加下面的内容:

<!DOCTYPE html>  
<html lang="en">  
<head>  
    <meta charset="utf-8">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" >
    <title>React & Webpack4</title>
</head>  
<body>  
    <div class="container">
        <div class="row mt-5">
            <div class="col-md-4 offset-md-1">
                <p>Create a new article</p>
                <div id="react-app">
                </div>
            </div>
        </div>
    </div>
</body>  
</html>  

接下来我们安装 webpack-dev-server 在开发时用于起一个服务器预览;

npm i webpack-dev-server --save-dev  

接下来修改 npm scripts:

"scripts": {
  "start": "webpack-dev-server --open --mode development",
  "build": "webpack"
}

差不多已经完成一部分了,后面你就可以再安装其他 react 套件了;

当然如果觉得麻烦你也可以使用 yarn-react-webpack-seed

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