新增示例demo

src/router/constant.ts

@@ -1,24 +1,6 @@
-import { MainView } from '@/layout/components/Main'
-
 export const RedirectName = 'Redirect';
 
-export const ParentLayout = 'ParentLayout';
-
 export const ErrorPage = () => import('@/views/exception/404.vue');
 
-/**
- * @description: default layout
- */
 export const Layout = () => import('@/layout/index.vue');
 
-/**
- * @description: parent-layout
- */
-export const getParentLayout = (_name?: string) => {
-  return () =>
-    new Promise((resolve) => {
-      resolve({
-        name: PARENT_LAYOUT_NAME,
-      });
-    });
-};