mode

public/index.html

@@ -7,7 +7,11 @@
   <meta name="viewport" content="width=device-width,initial-scale=1.0">
   <link rel="icon" href="<%= BASE_URL %>logo.ico">
   <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
+  <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.11/vue.min.js"></script>
+  <script src="https://cdn.bootcdn.net/ajax/libs/vuex/3.6.2/vuex.min.js"></script>
   <script src="https://unpkg.com/element-ui/lib/index.js"></script>
+  <script src="https://cdn.bootcdn.net/ajax/libs/echarts/4.1.0/echarts.min.js"></script>
+  <script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
   <title>
     <%= htmlWebpackPlugin.options.title %>
   </title>

vue.config.js

@@ -13,7 +13,11 @@ module.exports = {
   },
   configureWebpack: {
     externals: {
+      'vue': 'Vue',
       'element-ui': 'ELEMENT',
+      'vue-router': 'VueRouter',
+      'vuex': 'Vuex',
+      'axios': 'axios',
       'echarts': 'echarts'
     },
     resolve: {