fix

components/dropdown/demo/sub-menu.md

@@ -15,6 +15,8 @@ The menu has multiple levels.
       Cascading menu <a-icon type="down" />
     </a>
     <a-menu slot="overlay">
+      <a-menu-item>1st menu item</a-menu-item>
+      <a-menu-item>2nd menu item</a-menu-item>
       <a-sub-menu title="sub menu" key="test">
         <a-menu-item>3rd menu item</a-menu-item>
         <a-menu-item>4th menu item</a-menu-item>

components/dropdown/dropdown.vue

@@ -47,6 +47,7 @@ const Dropdown = {
       props: {
         mode: 'vertical',
         selectable,
+        isRootMenu: false,
       },
     })
     const dropdownProps = {

components/menu/index.vue

@@ -27,9 +27,11 @@ export const menuProps = {
   multiple: PropTypes.bool,
   inlineIndent: PropTypes.number.def(24),
   inlineCollapsed: PropTypes.bool,
+  isRootMenu: PropTypes.bool.def(true),
 }
 
 export default {
+  name: 'Menu',
   props: menuProps,
   Divider,
   Item,

components/menu/src/Menu.vue

@@ -24,7 +24,7 @@ const Menu = {
       sOpenKeys = props.openKeys || []
     }
 
-    this.isRootMenu = true
+    // this.isRootMenu = true
     return {
       sSelectedKeys,
       sOpenKeys,
@@ -177,7 +177,7 @@ const Menu = {
         openKeys: state.sOpenKeys,
         selectedKeys: state.sSelectedKeys,
         triggerSubMenuAction: this.$props.triggerSubMenuAction,
-        isRootMenu: true,
+        isRootMenu: this.isRootMenu,
       }
       return this.renderCommonMenuItem(c, i, subIndex, extraProps)
     },

components/menu/src/commonPropsType.js

@@ -22,4 +22,5 @@ export default {
   openTransitionName: PropTypes.string,
   forceSubMenuRender: PropTypes.bool,
   selectable: PropTypes.bool,
+  isRootMenu: PropTypes.bool,
 }