优化界面

src/App.vue

@@ -1,12 +1,15 @@
 <template>
-  <div id="app">
-    <router-view />
-  </div>
+  <MainLayout />
 </template>
 
 <script>
+import MainLayout from './layouts/MainLayout.vue';
+
 export default {
-  name: 'App'
+  name: 'App',
+  components: {
+    MainLayout
+  }
 };
 </script>
 
@@ -14,4 +17,4 @@ export default {
 #app {
   min-height: 100vh;
 }
-</style>
+</style>