Web Front-endJS TutorialHow to solve the problem that the files after webpack packaging are too largeHow to solve the problem that the files after webpack packaging are too large
本文主要和大家介绍了webpack打包之后的文件过大的解决方法,小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧，希望能帮助到大家。
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'
}),
]相关推荐：
vue-cli快速构建vue应用并实现webpack打包详解
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