vue-cli2 使用cdn资源

vue-cli2 引入固定cdn资源操作记录
vue引入cdn也不是什么神奇的操作，但是自己之前一直没有尝试过，这次正好项目优化需要，所以，实操一波，特此记录
本次cnd引入了如下资源

• vue
• vue-router
• axios
• vue-lazyload
  暂时就是上面四个，没有用到vuex，本来这次还引入了vue_i18n,但是通过cdn引入一直报错，很蛋疼，如果有谁知道怎么做烦请赐教。
  cnd资源都是https://www.jsdelivr.com/ 上面搜的
  稍微改造了
  build/webpack.base.conf.js
  build/webpack.dev.conf.js
  build/webpack.prod.conf.js

//webpack.base.conf.js
'use strict'
const path = require('path')
const utils = require('./utils')
const config = require('../config')
const vueLoaderConfig = require('./vue-loader.conf')

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



module.exports = {
  context: path.resolve(__dirname, '../'),
  entry: {
    app: './src/main.js'
  },
  output: {
    path: config.build.assetsRoot,
    filename: '[name].js',
    publicPath: process.env.NODE_ENV === 'production'
      ? config.build.assetsPublicPath
      : config.dev.assetsPublicPath
  },
  resolve: {
    extensions: ['.js', '.vue', '.json'],
    alias: {
      'vue$': 'vue/dist/vue.esm.js',
      '@': resolve('src'),
    }
  },
  module: {
    rules: [
      {
        test: /.vue$/,
        loader: 'vue-loader',
        options: vueLoaderConfig
      },
      {
        test: /.js$/,
        loader: 'babel-loader',
        include: [resolve('src'), resolve('test'), resolve('node_modules/webpack-dev-server/client')]
      },
      {
        test: /.(png|jpe?g|gif|svg)(?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 10000,
          name: utils.assetsPath('img/[name].[hash:7].[ext]')
        }
      },
      {
        test: /.(mp4|webm|ogg|mp3|wav|flac|aac)(?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 10000,
          name: utils.assetsPath('media/[name].[hash:7].[ext]')
        }
      },
      {
        test: /.(woff2?|eot|ttf|otf)(?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 10000,
          name: utils.assetsPath('fonts/[name].[hash:7].[ext]')
        }
      },
      {
        test: /.scss$/,
        loaders: ["style", "css", "sass"]
      }
    ]
  },
  node: {
    // prevent webpack from injecting useless setImmediate polyfill because Vue
    // source contains it (although only uses it if it's native).
    setImmediate: false,
    // prevent webpack from injecting mocks to Node native modules
    // that does not make sense for the client
    dgram: 'empty',
    fs: 'empty',
    net: 'empty',
    tls: 'empty',
    child_process: 'empty'
  },
  externals: {
    'vue': 'Vue',
    'vue-router': 'VueRouter',
    'axios': 'axios',
    'vue-lazyload':'VueLazyload'
    }
  }

//webpack.dev.conf.js,这个没有复制全，就改动了这么一小个地方
  new HtmlWebpackPlugin(Object.assign(
      {
        filename: 'index.html',
        template: 'index.html',
        inject: true
      },
      config.dev.cdn
      )
    ),

//webpack.prod.conf.js

 new HtmlWebpackPlugin(Object.assign(
      {
        filename: config.build.index,
        template: 'index.html',
        inject: true,
        minify: {
          removeAttributeQuotes:true,
          minimize: true,
          removeConments: true,
          collapseWhitespace: true,
          minifyCSS: true,
          minifyJS: true,
          // more options:
          // https://github.com/kangax/html-minifier#options-quick-reference
        },
        // necessary to consistently work with multiple chunks via CommonsChunkPlugin
        chunksSortMode: 'dependency'
      },
      config.build.cdn)
      ),

---

config/index.js

'use strict'
// Template version: 1.3.1
// see http://vuejs-templates.github.io/webpack for documentation.

const path = require('path')

module.exports = {
  dev: {

    // Paths
    assetsSubDirectory: 'static',
    assetsPublicPath: '/',
    proxyTable: {
    },

    // Various Dev Server settings
    host: 'localhost', // can be overwritten by process.env.HOST
    port: 8080, // can be overwritten by process.env.PORT, if port is in use, a free one will be determined
    autoOpenBrowser: false,
    errorOverlay: true,
    notifyOnErrors: true,
    poll: false, // https://webpack.js.org/configuration/dev-server/#devserver-watchoptions-


    /**
     * Source Maps
     */

    // https://webpack.js.org/configuration/devtool/#development
    devtool: 'cheap-module-eval-source-map',

    // If you have problems debugging vue-files in devtools,
    // set this to false - it *may* help
    // https://vue-loader.vuejs.org/en/options.html#cachebusting
    cacheBusting: true,

    cssSourceMap: false,
    cdn: {
      js: [
        "https://cdn.jsdelivr.net/npm/vue@2.6.11/dist/vue.js",
        "https://cdn.jsdelivr.net/npm/vue-router@3.1.3/dist/vue-router.js",
        "https://cdn.jsdelivr.net/npm/axios@0.19.0/dist/axios.min.js",
        "https://cdn.jsdelivr.net/npm/vue-lazyload@1.3.3/vue-lazyload.js"
      ]
    }
  },

  build: {
    // Template for index.html
    index: path.resolve(__dirname, '../dist/index.html'),

    // Paths
    assetsRoot: path.resolve(__dirname, '../dist'),
    assetsSubDirectory: 'static',
    assetsPublicPath: './',

    /**
     * Source Maps
     */

    productionSourceMap: false,
    // https://webpack.js.org/configuration/devtool/#production
    devtool: '#source-map',

    // Gzip off by default as many popular static hosts such as
    // Surge or Netlify already gzip all static assets for you.
    // Before setting to `true`, make sure to:
    // npm install --save-dev compression-webpack-plugin
    productionGzip: false,
    productionGzipExtensions: ['js', 'css'],

    // Run the build command with an extra argument to
    // View the bundle analyzer report after build finishes:
    // `npm run build --report`
    // Set to `true` or `false` to always turn it on or off
    bundleAnalyzerReport: process.env.npm_config_report,
    cdn: {
      js: [
        "https://cdn.jsdelivr.net/npm/vue@2.6.11/dist/vue.min.js",
        "https://cdn.jsdelivr.net/npm/vue-router@3.1.3/dist/vue-router.min.js",
        "https://cdn.jsdelivr.net/npm/axios@0.19.0/dist/axios.min.js",
        "https://cdn.jsdelivr.net/npm/vue-lazyload@1.3.3/vue-lazyload.min.js"
      ]
    }
  }
}

最后就是index.html了

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no ,viewport-fit=cover" name="viewport">
    <title>test</title>
  </head>
  <body>
    <div id="app"></div>
    <% for (var i in htmlWebpackPlugin.options.js&&htmlWebpackPlugin.options.js) { %>
    <script src="<%= htmlWebpackPlugin.options.js[i] %>"></script>
    <% } %>
  </body>
</html>

基本上这样就可以了，其实还有一些第三方插件，还不知道怎么通过cdn引入，有哪位大大比较有经验的，希望不吝赐教