在之前的文章中了解了webpack v4的特性,现在将知识用于实践,对之前写的一个react脚手架进行打包性能的优化。
优化类目
- 样式分离
- 第三方资源分离
- 区分开发环境
- 热更新
- 提取公共代码
1. CSS分离
npm install extract-text-webpack-plugin -D
webpack.config.js
将css、less、sass文件单独从打包文件中分离
+ let cssExtract = new ExtractTextWebpackPlugin({ + filename: 'css.css', + allChunks: true + }); + let sassExtract = new ExtractTextWebpackPlugin('sass.css') + let lessExtract = new ExtractTextWebpackPlugin('less.css')
在webpack.config.js中单独添加规则,
- test:匹配处理文件的扩展名的正则表达式
- include/exclude手动指定必须处理的文件夹或屏蔽不需要处理的文件夹
{ test: /\.css$/, use: cssExtract.extract({ fallback: "style-loader", use: ['css-loader"/dist" }), include:path.join(__dirname,'./src'), exclude:/node_modules/ }, { test: /\.scss$/, use: sassExtract.extract({ fallback: "style-loader", use: ["css-loader","sass-loader"], publicPath: "/dist" }), include:path.join(__dirname,'./src'), exclude:/node_modules/ }, { test: /\.less$/, loader: lessExtract.extract({ use: ["css-loader", "less-loader"] }), include:path.join(__dirname,'./src'), exclude:/node_modules/ },
然后运行webpack命令时报错
compilation.mainTemplate.applyPluginsWaterfall is not a function
Use Chunks.groupsIterable and filter by instanceof Entrypoint instead
研究得出结论:webpack升级到v4然而响应的插件没有升级的原故。
解决方法:安装指定版本的依赖
"html-webpack-plugin": "^3.0.4" "extract-text-webpack-plugin": "^4.0.0-beta.0"
resolve
指定extension之后可以不用在require或是import的时候加文件扩展名,会依次尝试添加扩展名进行匹配
resolve: { //引入模块的时候,可以不用扩展名 extensions: [".js", ".less", ".json"], alias: {//别名 "bootstrap": "bootstrap/dist/css/bootstrap.css" } }
监听文件修改
webpack模式下使用,webpack-dev-server模式不用,可以将watch改为false
watchOptions: { ignored: /node_modules/, aggregateTimeout: 300, //监听到变化发生后等300ms再去执行动作,防止文件更新太快导致编译频率太高 poll: 1000 //通过不停的询问文件是否改变来判断文件是否发生变化,默认每秒询问1000次 }
提取公共代码
optimization: { splitChunks: { cacheGroups: { commons: { chunks: "initial", minChunks: 2, maxInitialRequests: 5, // The default limit is too small to showcase the effect minSize: 0 // This is example is too small to create commons chunks }, vendor: { test: /node_modules/, chunks: "initial", name: "vendor", priority: 10, enforce: true } } } }
分离react react-dom ant公共代码
方法一:externals
在页面上引入第三方资源库,然后使用externals防止将某些 import 的包(package)打包到 bundle 中,而是在运行时(runtime)再去从外部获取这些扩展依赖(external dependencies)。
<script src="/UploadFiles/2021-04-02/react.production.min.js">方法二:DLL
DLL在上篇文章中写过,但是打包后一直出现
后来才发现是页面上没有引入资源。。。。(我一直以为会webpack自动生成在页面上....)
在index.html文件中引入
<script src="/UploadFiles/2021-04-02/react.dll.js">分离成功!上代码
webpack.base.js
var path = require('path'); var webpack = require('webpack'); var ExtractTextWebpackPlugin = require("extract-text-webpack-plugin"); const HtmlWebpackPlugin = require("html-webpack-plugin"); const CleanWebpackPlugin = require('clean-webpack-plugin'); const CopyWebpackPlugin = require('copy-webpack-plugin') let cssExtract = new ExtractTextWebpackPlugin({ filename: 'css.css', allChunks: true }); let sassExtract = new ExtractTextWebpackPlugin('sass.css') let lessExtract = new ExtractTextWebpackPlugin('less.css') module.exports = { entry:'./src/index.js', output: { path: path.resolve(__dirname, './dist'), filename: 'bundle.[hash:8].js', publicPath: '' }, resolve: { //引入模块的时候,可以不用扩展名 extensions: [".js", ".less", ".json"], alias: {//别名 "bootstrap": "bootstrap/dist/css/bootstrap.css" }, modules: [path.resolve(__dirname, 'node_modules')] }, /* externals: { 'react': 'React', 'react-dom': 'ReactDOM', // 提出ant design的公共资源 //'antd': 'antd', },*/ devtool: 'source-map', devServer: { contentBase:path.resolve(__dirname,'dist'), publicPath: '/', port: 8080, hot:true, compress:true, historyApiFallback: true, inline: true }, watch: false, //只有在开启监听模式时,watchOptions才有意义 watchOptions: { ignored: /node_modules/, aggregateTimeout: 300, //监听到变化发生后等300ms再去执行动作,防止文件更新太快导致编译频率太高 poll: 1000 //通过不停的询问文件是否改变来判断文件是否发生变化,默认每秒询问1000次 }, optimization: { splitChunks: { cacheGroups: { commons: { chunks: "initial", minChunks: 2, maxInitialRequests: 5, // The default limit is too small to showcase the effect minSize: 0 // This is example is too small to create commons chunks }, vendor: { test: /node_modules/, chunks: "initial", name: "vendor", priority: 10, enforce: true } } } }, module: { rules:[ { test: /\.js$/, use: { loader:'babel-loader', options: { presets: ['env','es2015', 'react'], } }, include:path.join(__dirname,'./src'), exclude:/node_modules/ }, { test: /\.css$/, use: cssExtract.extract({ fallback: "style-loader", use: ['css-loader"/dist" }), include:path.join(__dirname,'./src'), exclude:/node_modules/ }, { test: /\.scss$/, use: sassExtract.extract({ fallback: "style-loader", use: ["css-loader","sass-loader"], publicPath: "/dist" }), include:path.join(__dirname,'./src'), exclude:/node_modules/ }, { test: /\.less$/, loader: lessExtract.extract({ use: ["css-loader", "less-loader"] }), include:path.join(__dirname,'./src'), exclude:/node_modules/ }, { test: /\.(html|htm)/, use: 'html-withimg-loader' }, { test: /\.(png|jpg|gif|svg|bmp|eot|woff|woff2|ttf)/, use: { loader:'url-loader', options:{ limit: 5 * 1024, //指定拷贝文件的输出目录 outputPath: 'images/' } } } ] }, plugins: [ //定义环境变量 new webpack.DefinePlugin({ __development__: JSON.stringify(process.env.NODE_ENV) }), new CleanWebpackPlugin(['dist']), cssExtract, lessExtract, sassExtract, new HtmlWebpackPlugin({ title: 'React Biolerplate by YuanYuan', template: './src/index.html', filename: `index.html`, hash: true }), new webpack.DllReferencePlugin({ manifest: path.join(__dirname, 'vendor', 'react.manifest.json') }), new CopyWebpackPlugin([{ from: path.join(__dirname,'vendor'),//静态资源目录源地址 to:'./vendor' //目标地址,相对于output的path目录 }]), /* new webpack.optimize.CommonsChunkPlugin({ name: 'common' // 指定公共 bundle 的名称。 + })*/ new webpack.HotModuleReplacementPlugin(), // 热替换插件 new webpack.NamedModulesPlugin() // 执行热替换时打印模块名字 ] };webpack.config.js
const path = require('path'); const webpack = require('webpack'); const merge = require('webpack-merge');//用来合并配置文件 const base = require('./webpack.base'); let other = ''; //console.log(process.env.NODE_ENV ) if (process.env.NODE_ENV == 'development') { other = require('./webpack.dev.config'); } else { other = require('./webpack.prod.config'); } //console.log(merge(base, other)); module.exports = merge(base, other); webpack.prod.config.js const path = require('path'); const webpack = require('webpack'); const UglifyJSPlugin = require('uglifyjs-webpack-plugin') module.exports = { output: { filename: 'bundle.min.js', }, plugins: [ new UglifyJSPlugin({sourceMap: true}) ] }原脚手架地址
优化后手架地址
打包速度优化,打包文件细化,改造成功~
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
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稳了!魔兽国服回归的3条重磅消息!官宣时间再确认!
昨天有一位朋友在大神群里分享,自己亚服账号被封号之后居然弹出了国服的封号信息对话框。
这里面让他访问的是一个国服的战网网址,com.cn和后面的zh都非常明白地表明这就是国服战网。
而他在复制这个网址并且进行登录之后,确实是网易的网址,也就是我们熟悉的停服之后国服发布的暴雪游戏产品运营到期开放退款的说明。这是一件比较奇怪的事情,因为以前都没有出现这样的情况,现在突然提示跳转到国服战网的网址,是不是说明了简体中文客户端已经开始进行更新了呢?
更新日志
- 凤飞飞《我们的主题曲》飞跃制作[正版原抓WAV+CUE]
- 刘嘉亮《亮情歌2》[WAV+CUE][1G]
- 红馆40·谭咏麟《歌者恋歌浓情30年演唱会》3CD[低速原抓WAV+CUE][1.8G]
- 刘纬武《睡眠宝宝竖琴童谣 吉卜力工作室 白噪音安抚》[320K/MP3][193.25MB]
- 【轻音乐】曼托凡尼乐团《精选辑》2CD.1998[FLAC+CUE整轨]
- 邝美云《心中有爱》1989年香港DMIJP版1MTO东芝首版[WAV+CUE]
- 群星《情叹-发烧女声DSD》天籁女声发烧碟[WAV+CUE]
- 刘纬武《睡眠宝宝竖琴童谣 吉卜力工作室 白噪音安抚》[FLAC/分轨][748.03MB]
- 理想混蛋《Origin Sessions》[320K/MP3][37.47MB]
- 公馆青少年《我其实一点都不酷》[320K/MP3][78.78MB]
- 群星《情叹-发烧男声DSD》最值得珍藏的完美男声[WAV+CUE]
- 群星《国韵飘香·贵妃醉酒HQCD黑胶王》2CD[WAV]
- 卫兰《DAUGHTER》【低速原抓WAV+CUE】
- 公馆青少年《我其实一点都不酷》[FLAC/分轨][398.22MB]
- ZWEI《迟暮的花 (Explicit)》[320K/MP3][57.16MB]