Detailed explanation of using webpack to build ReactApp case-JS Tutorial-php.cn

Detailed explanation of using webpack to build ReactApp case

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Release： 2018-05-25 14:04:32

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This time I will bring you a detailed explanation of the case of using webpack to build ReactApp. What are the precautions for using webpack to build ReactApp. The following is a practical case, let's take a look.

npm install -g create-react-app
create-react-app my-app
cd my-app
npm start

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Using Taobao NPM image

Using React and Webpack requires installing a lot of dependency packages. Without an agent, the speed will be very slow and very slow. It is easy to make mistakes, so it is recommended to use Taobao's npm image to install, the speed is very ideal.

It only takes two steps to install the npm package using Taobao mirror:

Install cnpm

npm install -g cnpm --registry=https://registry.npm.taobao.org

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Use cnpm to install the package

Just replace npm Become cnpm to get high-speed downloads.

cnpm install [name]

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All the commands for installing dependent packages given below are installed using cnpm. You can also use npm.

Start the first React

Initialize a json Configuration file

npm init

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Enter some information after executing the above command A json file can be created. This file can also be created manually. The entry point needs to be filled in index.js, the rest is optional.

Install React

cnpm install react react-dom --save

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Install the compilation tool babel

Copy code The code is as follows :

cnpm install babel-core babel-loader babel-preset-react babel-preset-es2015 --save-dev

Install packaging tool wepback

It is best to install both the global and current folder, so that you can package it in a fancy way.

cnpm install webpack webpack-cli --save-dev
cnpm install webpack-dev-server --save-dev
cnpm install webpack webpack-cli -g
cnpm install webpack-dev-server -g

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Configuration webpack

For convenience, all the following files are built in the same folder.

Create new webpack.config.js and add the following content

const path =require('path'); 
module.exports = { 
 entry: path.resolve(dirname, 'index.js'), 
 output: { 
 path: path.resolve(dirname, ''), 
 filename: "bundle.js" 
 }, 
 mode: 'development',
 module: { 
 rules: [ 
  { 
  test: /\.js$/, 
  exclude: /node_modules/, 
  loader: "babel-loader", 
  options: { 
   presets: ["es2015","react"] 
  } 
  } 
 ] 
 } 
};

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In webpack4, there will be a warning if the mode attribute is not specified.

Create test file

New index.js file

import React from 'react'; 
import ReactDOM from 'react-dom'; 
 ReactDOM.render( 
 <h1>我的第一个react例子</h1>, 
 document.getElementById('root') 
 );

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New index.html file

<!DOCTYPE html> 
 <html> 
 <head> 
 <meta charset="UTF-8" /> 
 <title>example</title> 
 </head> 
 <body> 
 <p id="root"></p> 
 <script src="bundle.js"></script> 
 </body> 
 </html>

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Start

Finally execute webpack to package index.js and generate a browser-executable bundle.js file. At this point, the index.html file is ready to be executed in the browser.

Attach my package.json file and directly execute cnpm install to install all dependencies.

{
 "name": "myapp",
 "version": "1.0.0",
 "description": "",
 "main": "index.js",
 "scripts": {
 "start": "webpack",
 "start:dev": "webpack-dev-server"
 },
 "author": "",
 "license": "ISC",
 "devDependencies": {
 "babel-core": "^6.26.0",
 "babel-loader": "^7.1.4",
 "babel-preset-es2015": "^6.24.1",
 "babel-preset-react": "^6.24.1",
 "webpack": "^4.2.0",
 "webpack-cli": "^2.0.12",
 "webpack-dev-server": "^3.1.1"
 },
 "dependencies": {
 "react": "^16.2.0",
 "react-dom": "^16.2.0"
 }
}

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Hot start

If index.js changes, you need to compile and package it again to update the bundle.js file, which is very inefficient. webpack provides a command to compile and package in real time.

webpack --watch

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After executing this command, the index.js file can be dynamically compiled and packaged, which is very convenient.

However, the above hot start is still very troublesome, and you have to refresh the browser manually. There is something very awesome here.

Directly execute webpack-dev-server to automatically refresh the browser

If you want to change the port, add --port port after the startup command Just use the number, for example: webpack-dev-server --port 8001

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!