vue -03 How to optimize the vue project to reduce the size of the project

Problem: Through the analysis report of the UI interface, it is found that many components in the project's dependencies take up a lot of space, and some packages in the resources take up a lot of space
Insert picture description here

Optimization steps:
1. Create a new vue.config.js file, configure development and release modes in it respectively

module.exports = {
  chainWebpack: config => {
    // 发布模式
    config.when(process.env.NODE_ENV === 'production', config => {
      config.entry('app').clear().add('./src/main-prod.js')
    })

    // 开发模式
    config.when(process.env.NODE_ENV === 'development', config => {
      config.entry('app').clear().add('./src/main-dev.js')
    })
  }
}

(Main-prod and main-dev.js are copies of the previous main.js file)

2. Configure the global search for the specified component in the vue.config.js file

module.exports = {
  chainWebpack: config => {
    // 发布模式
    config.when(process.env.NODE_ENV === 'production', config => {
      config.entry('app').clear().add('./src/main-prod.js')

      // 解决build项目时一个单一的包过于大的问题，原因是添加的依赖直接合并到了这个包
      config.set('externals', {
        vue: 'Vue',
        'vue-router': 'VueRouter',
        axios: 'axios',
        lodash: '_',
        echarts: 'echarts',
        nprogress: 'NProgress',
        'vue-quill-editor': 'VueQuillEditor'
      })
    })

    // 开发模式
    config.when(process.env.NODE_ENV === 'development', config => {
      config.entry('app').clear().add('./src/main-dev.js')
    })
  }
}

3. Delete the imported style sheet in the main-prod.js file, namely the css file, and import the deleted style sheet in the index.html file

<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <link rel="icon" href="<%= BASE_URL %>favicon.ico">
    <title><%= htmlWebpackPlugin.options.title %></title>

<!--      需要的样式表-->
      <!-- nprogress 的样式表文件 -->
      <link rel="stylesheet" href="https://cdn.staticfile.org/nprogress/0.2.0/nprogress.min.css" />
      <!-- 富文本编辑器 的样式表文件 -->
      <link rel="stylesheet" href="https://cdn.staticfile.org/quill/1.3.4/quill.core.min.css" />
      <link rel="stylesheet" href="https://cdn.staticfile.org/quill/1.3.4/quill.snow.min.css" />
      <link rel="stylesheet" href="https://cdn.staticfile.org/quill/1.3.4/quill.bubble.min.css" />
  </head>
  <body>
    <noscript>
      <strong>We're sorry but <%= htmlWebpackPlugin.options.title %> doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>

4. Add the cdn resource reference in the index.html file, that is, the js file

<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <link rel="icon" href="<%= BASE_URL %>favicon.ico">
    <title><%= htmlWebpackPlugin.options.title %></title>

<!--      需要的样式表-->
      <!-- nprogress 的样式表文件 -->
      <link rel="stylesheet" href="https://cdn.staticfile.org/nprogress/0.2.0/nprogress.min.css" />
      <!-- 富文本编辑器 的样式表文件 -->
      <link rel="stylesheet" href="https://cdn.staticfile.org/quill/1.3.4/quill.core.min.css" />
      <link rel="stylesheet" href="https://cdn.staticfile.org/quill/1.3.4/quill.snow.min.css" />
      <link rel="stylesheet" href="https://cdn.staticfile.org/quill/1.3.4/quill.bubble.min.css" />

<!--      需要的js文件-->
      <script src="https://cdn.staticfile.org/vue/2.5.22/vue.min.js"></script>
      <script src="https://cdn.staticfile.org/vue-router/3.0.1/vue-router.min.js"></script>
      <script src="https://cdn.staticfile.org/axios/0.18.0/axios.min.js"></script>
      <script src="https://cdn.staticfile.org/lodash.js/4.17.11/lodash.min.js"></script>
      <script src="https://cdn.staticfile.org/echarts/4.1.0/echarts.min.js"></script>
      <script src="https://cdn.staticfile.org/nprogress/0.2.0/nprogress.min.js"></script>
      <!-- 富文本编辑器的 js 文件 -->
      <script src="https://cdn.staticfile.org/quill/1.3.4/quill.min.js"></script>
      <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue-quill-editor.js"></script>

  </head>
  <body>
    <noscript>
      <strong>We're sorry but <%= htmlWebpackPlugin.options.title %> doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>

5. Optimize element-ui:
1) Comment out the code that element-ui loads on demand in main-prod.js

		在main-prod.js中注释掉` import './plugins/element.js'`

2) Load the css and js of element-ui through cdn in index.html

<!-- element-ui的js -->
<script src="https://cdn.staticfile.org/element-ui/2.8.2/index.js"></script>
<!-- element-ui 的样式表文件 -->
<link rel="stylesheet" href="https://cdn.staticfile.org/element-ui/2.8.2/theme-chalk/index.css" />

vue -03 How to optimize the vue project to reduce the size of the project

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