接上文
5）优化插件 [OccurenceOrderPlugin、UglifyJsPlugin、ExtractTextPlugin]
webpack提供了一些在发布阶段非常有用的优化插件，它们大多来自于webpack社区，可以通过npm安装，通过以下插件可以完成产品发布阶段所需的功能
- OccurenceOrderPlugin :为组件分配ID，通过这个插件webpack可以分析和优先考虑使用最多的模块，并为它们分配最小的ID；
- UglifyJsPlugin：压缩JS代码；
- ExtractTextPlugin：分离CSS和JS文件.
内置插件：OccurenceOrder、UglifyJS plugins
外置插件：ExtractTextPlugin
① 安装外置插件：npm install --save-dev extract-text-webpack-plugin
===版本号===>
+ extract-text-webpack-plugin@3.0.2
added 6 packages from 6 contributors in 6.929s
② 更改 webpack.production.config.js配置文件
// webpack.production.config.js
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
module.exports = {
entry: __dirname + "/app/main.js",//已多次提及的唯一入口文件
output: {
path: __dirname + "/build",
filename: "bundle.js"
},
devtool: 'none',
devServer: {
contentBase: "./public",//本地服务器所加载的页面所在的目录
historyApiFallback: true,//不跳转
inline: true,
hot: true
},
module: {
rules: [
{
test: /(\.jsx|\.js)$/,
use: {
loader: "babel-loader"
},
exclude: /node_modules/
},
{
test: /\.css$/,
use: [
{
loader: "style-loader"
}, {
loader: "css-loader",
options: {
modules: true
}
}, {
loader: "postcss-loader"
}
]
}
]
},
plugins: [
new webpack.BannerPlugin('版权所有，翻版必究'),
new HtmlWebpackPlugin({
template: __dirname + "/app/index.tmpl.html"
}),
new webpack.optimize.OccurrenceOrderPlugin(),
new webpack.optimize.UglifyJsPlugin(),
new ExtractTextPlugin("style.css")
],
};
③ 执行打包： npm run build, 会报错
192:webpacktest hao$ npm run build
> webpacktest@1.0.0 build /Users/hao/pro/webpacktest
> NODE_ENV=production webpack --config ./webpack.production.config.js --progress
10% building 0/0 modules 0 active(node:11864) DeprecationWarning: Tapable.plugin is deprecated. Use new API on `.hooks` instead
78% module and chunk tree optimization unnamed compat plugin/Users/hao/node_modules/webpack/lib/Chunk.js:866
throw new Error(
^
Error: Chunk.entrypoints: Use Chunks.groupsIterable and filter by instanceof Entrypoint instead
at Chunk.get (/Users/hao/node_modules/webpack/lib/Chunk.js:866:9)
at /Users/hao/pro/webpacktest/node_modules/extract-text-webpack-plugin/dist/index.js:176:48
at Array.forEach (<anonymous>)
at /Users/hao/pro/webpacktest/node_modules/extract-text-webpack-plugin/dist/index.js:171:18
at AsyncSeriesHook.eval [as callAsync] (eval at create (/Users/hao/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:24:1)
at AsyncSeriesHook.lazyCompileHook (/Users/hao/node_modules/tapable/lib/Hook.js:154:20)
...
——————————————————————————————————————————
解决方案：
改用其他方式安装：npm install --save-dev extract-text-webpack-plugin@next
+ extract-text-webpack-plugin@4.0.0-beta.0
removed 4 packages and updated 2 packages in 5.716s
在package.json中的安装版本是:
④ 再次执行 npm run build，即可
To Be Continue~
参考文章
1. 入门 webpack，看这篇就够了
2. webpack 官网
3. webpack坑系列--安装webpack-cli
