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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                ### git * 最常用的代碼版本管理工具 * 常用 git 命令 * git add . * git checkout xxx * git commit -m "xxx" * git push origin master * git pull origin master ### webpack 和 babel #### 為什么需要 * ES6 模塊化,瀏覽器暫不支持 * ES6 語法,瀏覽器并不完全支持 * 壓縮代碼,整合代碼,讓網頁加載更快 #### webpack 配置 > 注意版本問題:最新版本的需要配置一些其他項 > > 所以我的是指定版本安裝:和視頻演示的版本一致 > > `npm install webpack@4.41.0 webpack-cli@3.3.9 webpack-dev-server@3.8.2 html-webpack-plugin@3.2.0 -D` * 初始化:`npm init -y` --> 生成 package.json 文件 * 安裝 webpack 依賴:`npm install webpack webpack-cli -D` -D 選項為開發依賴 * webpack.config.js 文件基本配置 * ```javascript const path = require('path') module.exports = { mode: 'development', // production development entry: path.join(__dirname, 'src', 'index.js'), output: { filename: 'bundle.js', path: path.join(__dirname, 'dist'), }, } ``` * ?pachage.json scripts 配置:`"build": "webpack"` 打包命令 * 擴展 html 打包; 安裝插件 * `npm i html-webpack-plugin -D` * `npm i webpack-dev-server -D ` * webpack.config.js 配置 * ```javascript const path = require('path') const HtmlWebpackPlugin = require('html-webpack-plugin') module.exports = { mode: 'development', // production development entry: path.join(__dirname, 'src', 'index.js'), output: { filename: 'bundle.js', path: path.join(__dirname, 'dist'), }, plugins: [ new HtmlWebpackPlugin({ template: path.join(__dirname, 'src', 'index.html'), filename: 'index.html', // 打包后的 dist 下的文件名 }), ], devServer: { port: 3000, contentBase: path.join(__dirname, 'dist'), }, } ``` * package.json 配置 * ```javascript "scripts": { "dev": "webpack-dev-server", "build": "webpack [--config webpack.config.js]", "test": "echo \"Error: no test specified\" && exit 1" }, ``` * `npm run dev` 執行本地運行 ##### babel 配置、轉義為 ES5 * `npm i @babel/core @babel/preset-env babel-loader -D` * `.babelrc` 文件配置 * ```javascript { "presets": ["@babel/preset-env"] } ``` * webpack.config.js 配置 * ```javascript module: { rules: [ { test: /\.js$/, // 符合此正則的走 babel-loader 插件 loader: ['babel-loader'], include: path.join(__dirname, 'src'), // 此目錄下的走 babel-loader 插件 exclude: /node_modules/, // 排除此目錄 }, ], }, ``` ##### ES6 模塊化 * 第一種方式 ```javascript // a.js 導出多個 export function fn() { console.log('fn') } export const name = 'a' export const obj = { name: 'zhangsan', } // index.js 導入,需要解構 import { fn, name, obj } from './a' fn() // 正常使用 console.log(name,obj) ``` * 第二種方式 ```javascript // 導出一個 const obj = { name:'xxx' } export default obj // 導入,不需要解構 import obj from './c' ``` ##### 生產環境配置 * webpack.prod.js * package.json scripts `"build": "webpack --config webpack.prod.js",` * ```javascript const path = require('path') const HtmlWebpackPlugin = require('html-webpack-plugin') module.exports = { mode: 'production', // production development entry: path.join(__dirname, 'src', 'index.js'), output: { filename: 'bundle.[contenthash].js',// contenthash 根據代碼內容計算出的哈希值 path: path.join(__dirname, 'dist'), }, module: { rules: [ { test: /\.js$/, // 符合此正則的走 babel-loader 插件 loader: ['babel-loader'], include: path.join(__dirname, 'src'), // 此目錄下的走 babel-loader 插件 exclude: /node_modules/, // 排除此目錄 }, ], }, plugins: [ new HtmlWebpackPlugin({ template: path.join(__dirname, 'src', 'index.html'), filename: 'index.html', // 打包后的 dist 下的文件名 }), ], } ``` 完整 webpack demo [gitee倉庫](https://gitee.com/yishen_yishen/webpack-demo)
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