feat[menu]: add alwaysShow option

src/router/index.js

@@ -15,6 +15,9 @@ import Layout from '../views/layout/Layout'
 
 /**
 * hidden: true                   if `hidden:true` will not show in the sidebar(default is false)
+* alwaysShow: true               if set true, will always show the root menu, whatever its child routes length
+*                                if not set alwaysShow, only more than one route under the children
+*                                it will becomes nested mode, otherwise not show the root menu
 * redirect: noredirect           if `redirect:noredirect` will no redirct in the breadcrumb
 * name:'router-name'             the name is used by <keep-alive> (must set!!!)
 * meta : {
@@ -217,7 +220,9 @@ export const asyncRouterMap = [
     path: '/zip',
     component: Layout,
     redirect: '/zip/download',
-    children: [{ path: 'download', component: _import('zip/index'), name: 'exportZip', meta: { title: 'exportZip', icon: 'zip' }}]
+    alwaysShow: true,
+    meta: { title: 'zip', icon: 'zip' },
+    children: [{ path: 'download', component: _import('zip/index'), name: 'exportZip', meta: { title: 'exportZip' }}]
   },
 
   {