feat[menu]: add alwaysShow option

src/router/index.js

@@ -11,6 +11,9 @@ 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 : {

src/views/layout/components/Sidebar/SidebarItem.vue

@@ -2,7 +2,7 @@
   <div class="menu-wrapper">
     <template v-for="item in routes" v-if="!item.hidden&&item.children">
 
-      <router-link v-if="item.children.length===1 && !item.children[0].children" :to="item.path+'/'+item.children[0].path" :key="item.children[0].name">
+      <router-link v-if="item.children.length===1 && !item.children[0].children && !item.alwaysShow" :to="item.path+'/'+item.children[0].path" :key="item.children[0].name">
         <el-menu-item :index="item.path+'/'+item.children[0].path" :class="{'submenu-title-noDropdown':!isNest}">
           <svg-icon v-if="item.children[0].meta&&item.children[0].meta.icon" :icon-class="item.children[0].meta.icon"></svg-icon>
           <span v-if="item.children[0].meta&&item.children[0].meta.title">{{item.children[0].meta.title}}</span>