bug fix：解决回退页面不缓存数据的问题

ant-design-vue-jeecg/src/App.vue

@@ -1,7 +1,10 @@
 <template>
   <a-config-provider :locale="locale">
     <div id="app">
-      <router-view/>
+      <keep-alive>
+        <router-view v-if="$route.meta.keepAlive"></router-view>
+      </keep-alive>
+      <router-view v-if="!$route.meta.keepAlive"></router-view>
     </div>
   </a-config-provider>
 </template>

ant-design-vue-jeecg/src/config/router.config.js

@@ -46,19 +46,19 @@ export const constantRouterMap = [
   {
     path: '/defaultDocSearch',
     name:'defaultDocSearch',
-    meta: { title: '首页' },
+    meta: { title: '首页' ,keepAlive: true },
     component: () => import('@/views/km/search/DefaultDocSearch')
   },
   {
     path:'/advancedSearch',
     name:'advancedSearch',
-    meta: { title: '高级检索' },
+    meta: { title: '高级检索' ,keepAlive: true },
     component: () => import('@/views/km/search/AdvancedSearch')
   },
   {
     path:'/docSearch',
     name:'docSearch',
-    meta: { title: '检索结果' },
+    meta: { title: '检索结果' ,keepAlive: true },
     component: () => import('@/views/km/search/DocSearch')
   },
   {