


A brief discussion on how to solve the problem of excessively large files after webpack packaging
这篇文章主要介绍了浅谈webpack打包之后的文件过大的解决方法,现在分享给大家,也给大家做个参考。
以前一直使用 create-react-app 这个脚手架进行 react 开发,后面因为一些自定义的配置,转而使用 webpack 搭建一套自己的脚手架。但是在使用 webpack 打包之后发现,纳尼?怎么文件这么大??? 于是研究了一下如何处理 webpack 打包之后文件太大的情况,简单记录下来。
首先配置全局变量
首先,通过指定环境,告诉 webpack 我们当前处于 production 环境中,要按照 production 的方式去打包。
//指定环境,将process.env.NODE_ENV环境与library关联 new Webpack.DefinePlugin({ 'process.env.NODE_ENV': JSON.stringify('production'), }),
优化 devtool 中的 source-map .
dev-tool 提供了很多种选项,用来增强我们 debug 的能力,我们熟知的有: source-map , inline-source-map , cheap-source-map 等等。详细的用法可以参考Devtool官方文档,Devtool配置对比 , webpack sourcemap 选项多种模式的一些解释 , https://webpack.github.io/docs/configuration.html#devtool 如果你的文件在打包之后突然变成好几M,那么不用想,肯定是因为 source-map 的原因。 source-map 在开发阶段确实很好用,调试起来很方便,但是在生产环境下就没必要部署了。 建议在 prod 环境下关闭 source-map 。
剥离css文件,单独打包
安装 webpack 插件 extract-text-webpack-plugin 。 npm install extract-text-webpack-plugin --save-dev 。 使用方法:
plugins:[ new ExtractTextPlugin('static/css/styles.[contenthash].css'), ]
这里使用了 contenthash , webpack 会根据内容去生成 hash 值。
使用 UglifyJSPlugin 压缩。
通过 UglifyJSPlugin 可以压缩我们的 *.js 文件。 安装方法: npm install uglifyjs-webpack-plugin --save-dev 。 用法: UglifyJSPlugin详细用法
const UglifyJsPlugin = require('uglifyjs-webpack-plugin') module.exports = { plugins: [ new UglifyJSPlugin({ parallel: 4, uglifyOptions: { output: { comments: false, beautify: false, }, compress: { warnings: false }, }, cache: true, }), ] }
提取公共依赖
使用 CommonsChunkPlugin 插件,将多个 js 文件进行提取,建立一个独立的文件。这个文件包含一些共用模块,浏这样览器只在刚开始的时候加载一次,便缓存起来供后续使用。而不用每次访问一个新界面时,再去加载一个更大的文件。
entry:{ app:'./entry', vendor:['react','other-lib'], }, plugins:[ new Webpack.optimize.CommonsChunkPlugin({ name: 'vendor', }), ]
开启gzip压缩
我们使用 compression-webpack-plugin 插件进行压缩。 安装: npm install compression-webpack-plugin --save-dev 。 compression-webpack-plugin 详细用法 使用:
const CompressionPlugin = require("compression-webpack-plugin"); plugins:[ new CompressionPlugin({ asset: '[path].gz[query]', //目标资源名称。[file] 会被替换成原资源。[path] 会被替换成原资源路径,[query] 替换成原查询字符串 algorithm: 'gzip',//算法 test: new RegExp( '\\.(js|css)$' //压缩 js 与 css ), threshold: 10240,//只处理比这个值大的资源。按字节计算 minRatio: 0.8//只有压缩率比这个值小的资源才会被处理 }) ]
压缩结果:
开启html压缩,自动添加上面生成的静态资源
添加插件 html-webpack-plugin
安装: npm install html-webpack-plugin --save-dev
用法:
plugins:[ new HtmlWebpackPlugin({ title: '', template: __dirname + '/../public/index.html', minify: { removeComments: true, collapseWhitespace: true, removeRedundantAttributes: true, useShortDoctype: true, removeEmptyAttributes: true, removeStyleLinkTypeAttributes: true, keepClosingSlash: true, minifyJS: true, minifyCSS: true, minifyURLs: true, }, chunksSortMode:'dependency' }), ]
上面是我整理给大家的,希望今后会对大家有帮助。
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