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This time I will bring you the entry, output, and module analysis of webpack3. one time.
As a popular tool today, webpack is inseparable from the three major front-end frameworks, so it is necessary to learn it;
Prerequisites: There is a node environment and npm tools; (new version The node comes with the npm tool);
Now let’s do it step by step:
1. First select a directory as the location where your project is stored;
cmd The tool enters the project directory (assuming mine is D:\webpack-demo4); and then uses nmp
to installwebpack: npm install webpack --save-dev("Global installation is not recommended"); Use npm init after finishing your project directory, followed by some descriptive content. How to omit it and directly npm init -y;
dist and src directories I created it myself, dist is used to store compiled files, and src is used to store source files; node_modules is a newly initialized folder with various modules in it. In the future, all modules related to project construction will be (it should also be ) placed in this directory; webpack.config.js is the webpack configuration item; package.json is some configuration for node operations (in fact, it is for webpack);
Webpack.config.js configuration (so many for now) );
First of all, let’s talk about what this configuration is used for. In fact, it is to tell webpack how to package; explain them one by one; ##Entry file
; It means which js file it starts from; talk about this relative path, this is calculated from the directory you enter with the cmd command line; for example, mine is: [ webpack- demo4] -->There is dist directory and src directory below; then when I run the configuration, I should go to webpack-demo4 and then webpack --config webpack-config.js (or webpack directly); module There are two loaders for loading files and css stored in it; Of course, before running webpack, you need to install npm install style-loader css loader --save -dev and npm install file-loader --save -dev; When you need to cd to the webpak-demo4 directory; Now I have an index002.html written by myself in the dist directory: as follows;<html> <head> <title>Output Management(输出)</title> <meta charset=utf-8> </head> <body> </body> </html> <script src="./js/app.bundle.js"></script>There are two js files in the src directory;
index.js import _ from 'lodash'; import '../css/style1.css'; import icon1 from '../img/aa00.jpg'; import printMe from './print.js'; function component() { var div = document.createElement('div'); var btn = document.createElement('button'); // Lodash(目前通过一个 script 脚本引入)对于执行这一行是必需的 div.innerHTML = _.join(['Hello', 'webpack'], ' '); var img = new Image(); img.src = icon1; div.appendChild(img); btn.innerHTML = 'Click me and check the console!'; btn.onclick = printMe; div.appendChild(btn); return div; } document.body.appendChild(component()); //放回元素给到页面;Let’s talk about something important; import '../css/style1.css'; is that there is style1.css under css in the superior directory (src) relative to index.js; for example, I wrote The background of the body is blue; a picture is also stored under img; Then the picture and print.js are introduced respectively; print.js:
export default function printMe() { console.log('print.js...');} 完成之后,直接Command webpack in cmd; pictures and styles appear; check that the packaged js and pictures will appear in the dist directory; the above example shows how webpack packages css, pictures and other simple operations;
believe it After reading the case in this article, you have mastered the method. For more exciting information, please pay attention to other related articles on the PHP Chinese website!
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