refactor: Vue升级3.0 移除多余依赖

src/App.vue

@@ -1,5 +1,9 @@
 <template>
-  <div id="app">
-    <router-view/>
+  <div class="app">
+    <Main></Main>
   </div>
 </template>
+
+<script setup>
+import Main from './views/Main.vue'
+</script>

src/main.js

@@ -1,10 +1,9 @@
-import Vue from 'vue'
+import { createApp } from 'vue'
 import App from './App.vue'
-import router from './router'
+import less from 'less'
 
-Vue.config.productionTip = false
+const app = createApp(App)
 
-new Vue({
-  router,
-  render: (h) => h(App)
-}).$mount('#app')
+app.use(less)
+
+app.mount('#app')