Web Front-endJS TutorialDetailed answers to Webpack+Babel+React environment construction (detailed tutorial)Detailed answers to Webpack+Babel+React environment construction (detailed tutorial)
This article mainly introduces the steps to build the Webpack Babel React development environment in detail. It has certain reference value. Interested friends can refer to it
1. Get to know Webpack
Before building the application, let’s first understand Webpack. Webpack is a module packaging tool that can compile various files (such as ReactJS, Babel, Coffeescript, Less/Sass, etc.) as modules. Pack.
2. Install Webpack
To start using Webpack for development in the project, we first need to install it in the global environment.
npm install webpack -g
3. Create a project
After installation, create a project named learn-webpack and enter the project folder. Of course, you can name the project as you wish. The name you want.
mkdir learn-webpack && cd learn-webpack
Find the project folder you just created through the editor
Now let’s create 2 files:
app. js
document.querySelector('#app').innerHTML = 'Hello World!';
index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Learn-webpack</title> </head> <body> <p id="app"></p> <script src="dist/bundle.js"></script> </body> </html>
Then execute
webpack ./app.js ./dist/bundle.js
in the terminal
Finally execute to start the local http service
python -m SimpleHTTPServer
At this time you can enter in the browser: http://localhost:8000
If you can see Hello world! in the browser, it means that you have successfully used Webpack to package and compile main.js into bundle.js. Isn’t it very simple?
Define a configuration file
The above is just a brief introduction to the use of Webpack. In fact, every project should contain a webpack.config. js, used to tell Webpack what needs to be done.
module.exports = {
entry: "app.js",
output: {
path: __dirname+"/dist",
filename: "bundle.js"
}
}Now run in the terminal: webpack
See if the packaging and compilation result of webpack ./app.js ./dist/bundle.js is the same as before.
entry: Specify the packaged entry file
1. Package a single file into a single output file and write the name of the file directly, for example: entry: "main.js "
2. Pack multiple files into a single output file and put the file names into an array, for example: entry:['main.js','xx.js']
3 .Package multiple files into multiple output files, put the file names into a key pair, for example: entry: {a:'main.js',b:'xx.js'}
output: Configure packaging results
path is the defined output folder, filename is the name of the packaging result file, if the designated packaging entry file is the above 1 or 2 situations, filename is directly as you want The output file name. If it is the third case, filename needs to be written as [name].filename.js, and [name] in filename is the key in entry.
Monitoring changes and automatic packaging
When we are constantly changing the code, in order not to modify it once, we package it manually again. You can use webpack's watch function.
webpack --watch or webpack -w
Or you can set watch to true directly in the configuration code
module.exports = {
entry: "app.js",
output: {
path: __dirname+"/dist",
filename: "bundle.js"
},
watch: true
}4. Use Babel
What is Babel? Babel is a JavaScript compiler. Use it to convert ES6 syntax to ES5 syntax so that it can be executed in current environments.
Execute in the terminal: npm install webpack babel-loader babel-core babel-preset-es2015 --save-dev
After the installation is completed, you need to modify the previous webpack.config.js to :
module.exports = {
entry: "./app.js",
output: {
path: __dirname+"/dist",
filename: "bundle.js"
},
module: {
loaders: [
{
test: /\.jsx?$/,
loader: 'babel-loader',
exclude: /node_modules/,
query: {
presets: ['es2015']
}
}
]
},
resolve: {
extensions: ['','.coffee','.js']
}
}Now you can write code in the file using ES6 syntax. Let’s test it by adding:
var func = str => {
console.log(str);
};
func('我现在在使用Babel!');ES6 supports using arrows to define functions. If You can see the printed text "I am using Babel now!" on the console, indicating that our Babel module is successfully installed and you can start writing code using ES6.
The loaders item indicates the loader used to load this type of resource.
test is a regular rule indicating the resource type to be matched.
exclude specifies files that should be ignored. We specify /node_modules/ here.
There are two ways to write query. One is to directly follow the loader name in string form:
loader: 'babel-loader?presets[]=es2015
The other is as shown in this article:
query: {
presets: ['es2015']
}resolve. extensions is used to indicate which suffixes the program automatically completes and recognizes.
Note that the first one in extensions is an empty string! Corresponding to the situation where suffixes are not needed.
5. Combined with React
We have configured and introduced Webpack and Babel before. The basic environment has been set up. Now we are starting to use React.
Enter the following code in the terminal to install react and react-dom
npm install react react-dom --save
Babel has all the default plug-ins for React
npm install babel-preset-react --save-dev
Since we have added the default plug-in for react , so webpack.config.js needs to be modified.
Modify the query under module -> loaders as follows:
query: {
presets: ['es2015','react']
}Now create a file named hello.js
import React from "react";
class Hello extends React.Component{
render() {
return (
<p>
Hello, World!
</p>
)
}
}
export default Hello;Then change the file in app.js Modify as follows:
import React from "react";
import ReactDOM from "react-dom";
import Hello from "./hello";
// var func = str => {
// console.log(str);
// };
//
// func('我现在在使用Babel!');
// document.querySelector('#app').innerHTML = 'Hello World!';
ReactDOM.render(
如果你能在浏览器里面看到 "Hello, React!"，就说明我们已经将Webpack+Babel+React的环境搭建好了，接下来我们就可以此基础上来进行开发了。
上面是我整理给大家的，希望今后会对大家有帮助。
相关文章：
如何解决vue 更改计算属性后select选中值不更改的问题，具体操作如下
如何解决iview 的select下拉框选项错位的问题，具体操作如下
The above is the detailed content of Detailed answers to Webpack+Babel+React environment construction (detailed tutorial). For more information, please follow other related articles on the PHP Chinese website!
JavaScript Engines: Comparing ImplementationsApr 13, 2025 am 12:05 AMDifferent JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.
Beyond the Browser: JavaScript in the Real WorldApr 12, 2025 am 12:06 AMJavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.
Building a Multi-Tenant SaaS Application with Next.js (Backend Integration)Apr 11, 2025 am 08:23 AMI built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing
How to Build a Multi-Tenant SaaS Application with Next.js (Frontend Integration)Apr 11, 2025 am 08:22 AMThis article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base
JavaScript: Exploring the Versatility of a Web LanguageApr 11, 2025 am 12:01 AMJavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.
The Evolution of JavaScript: Current Trends and Future ProspectsApr 10, 2025 am 09:33 AMThe latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.
Demystifying JavaScript: What It Does and Why It MattersApr 09, 2025 am 12:07 AMJavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.
Is Python or JavaScript better?Apr 06, 2025 am 12:14 AMPython is more suitable for data science and machine learning, while JavaScript is more suitable for front-end and full-stack development. 1. Python is known for its concise syntax and rich library ecosystem, and is suitable for data analysis and web development. 2. JavaScript is the core of front-end development. Node.js supports server-side programming and is suitable for full-stack development.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
SublimeText3 Chinese version
Chinese version, very easy to use
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
Dreamweaver Mac version
Visual web development tools
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
