修改顶部标题显示页面标题

src/App.vue

 <template>
   <div id="app">
-    <app-layout v-if="isInnerPage">
+    <app-layout
+      v-if="isInnerPage"
+      :title="title"
+    >
       <div
         class="AppTopBar"
         slot="title"
@@ -67,6 +70,7 @@ export default {
   },
   data() {
     return {
+      title: '',
       selectedRoute: [],
       routerDone: false,
       isInnerPage: true,
@@ -86,6 +90,7 @@ export default {
     } else {
       this.showComponents();
     }
+    this.title = document.title;
   },
   watch: {
     $route(newVal) {