为何我的vue.config.js和视频里面老师的不一样啊
’use strict’
const path = require(‘path’)
const defaultSettings = require(’./src/settings.js’)

function resolve(dir) {
return path.join(__dirname, dir)
}

const name = defaultSettings.title || ‘vue Element Admin’ // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following method:
// port = 9527 npm run dev OR npm run dev --port = 9527
const port = process.env.port || process.env.npm_config_port || 9527 // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
/**

• You will need to set publicPath if you plan to deploy your site under a sub path,
• for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
• then publicPath should be set to “/bar/”.
• In most cases please use ‘/’ !!!
• Detail: https://cli.vuejs.org/config/#publicpath
  /
  publicPath: ‘/’,
  outputDir: ‘dist’,
  assetsDir: ‘static’,
  lintOnSave: process.env.NODE_ENV === ‘development’,
  productionSourceMap: false,
  devServer: {
  port: port,
  open: true,
  overlay: {
  warnings: false,
  errors: true
  },
  before: require(’./mock/mock-server.js’)
  },
  configureWebpack: {
  // provide the app’s title in webpack’s name field, so that
  // it can be accessed in index.html to inject the correct title.
  name: name,
  resolve: {
  alias: {
  ’@’: resolve(‘src’)
  }
  }
  },
  chainWebpack(config) {
  // it can improve the speed of the first screen, it is recommended to turn on preload
  // it can improve the speed of the first screen, it is recommended to turn on preload
  config.plugin(‘preload’).tap(() => [
  {
  rel: ‘preload’,
  // to ignore runtime.js
  // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
  fileBlacklist: [/.mapKaTeX parse error: Can't use function '\.' in math mode at position 15: /, /hot-update\̲.̲js/, /runtime….js$/],
  include: ‘initial’
  }
  ])

// when there are many pages, it will cause too many meaningless requests
config.plugins.delete('prefetch')

// set svg-sprite-loader
config.module
  .rule('svg')
  .exclude.add(resolve('src/icons'))
  .end()
config.module
  .rule('icons')
  .test(/\.svg$/)
  .include.add(resolve('src/icons'))
  .end()
  .use('svg-sprite-loader')
  .loader('svg-sprite-loader')
  .options({
    symbolId: 'icon-[name]'
  })
  .end()

config
  .when(process.env.NODE_ENV !== 'development',
    config => {
      config
        .plugin('ScriptExtHtmlWebpackPlugin')
        .after('html')
        .use('script-ext-html-webpack-plugin', [{
        // `runtime` must same as runtimeChunk name. default is `runtime`
          inline: /runtime\..*\.js$/
        }])
        .end()
      config
        .optimization.splitChunks({
          chunks: 'all',
          cacheGroups: {
            libs: {
              name: 'chunk-libs',
              test: /[\\/]node_modules[\\/]/,
              priority: 10,
              chunks: 'initial' // only package third parties that are initially dependent
            },
            elementUI: {
              name: 'chunk-elementUI', // split elementUI into a single package
              priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
              test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
            },
            commons: {
              name: 'chunk-commons',
              test: resolve('src/components'), // can customize your rules
              minChunks: 3, //  minimum common number
              priority: 5,
              reuseExistingChunk: true
            }
          }
        })
      // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
      config.optimization.runtimeChunk('single')
    }
  )

}
}