When using Vue, I always reported errors when introducing components related to menus in antd, and other components unrelated to menus can be displayed normally. This bug bothered me for a long time, and finally found a solution to the problem on GitHub.

The error information is as follows:

Problem Description:

I first introduced it this way:

import Vue from 'vue'
import { Menu, Layout, Icon, Breadcrumb } from 'ant-design-vue'
Vue.use(Layout)
export default {

  components: {
    'a-menu': Menu,
    'a-icon': Icon,
    'a-breadcrumb': Breadcrumb,
    'a-breadcrumb-item': Breadcrumb.Item
  },

Then the browser kept reporting errors. By checking the error information on the browser console, I probably knew that it was due to the lack of asubmenu and amenuitem. Therefore, I introduced it, but I didn’t respond, so I thought it wasn’t this problem. After asking Du Niang, I couldn’t find a solution. Finally, I found that the way I introduced it was wrong on GitHub.

The correct approach should be to introduce the following in the component:

     components: {
    'a-menu': Menu,
    'a-icon': Icon,
    'a-breadcrumb': Breadcrumb,
    'a-breadcrumb-item': Breadcrumb.Item,
    ASubMenu: Menu.SubMenu,
    AMenuItem: Menu.Item
  },

Finally, the source code of the page is attached for reference:

<template>
  <a-layout id="components-layout-demo-top-side-2">
    <a-layout-header class="header">
      <div class="logo" />
      <a-menu
        theme="dark"
        mode="horizontal"
        :default-selected-keys="['2']"
        :style="{ lineHeight: '64px' }"
      >
        <a-menu-item key="1">
          nav 1
        </a-menu-item>
        <a-menu-item key="2">
          nav 2
        </a-menu-item>
        <a-menu-item key="3">
          nav 3
        </a-menu-item>
      </a-menu>
    </a-layout-header>
    <a-layout>
      <a-layout-sider width="200" style="background: #fff">
        <a-menu
          mode="inline"
          :default-selected-keys="['1']"
          :default-open-keys="['sub1']"
          :style="{ height: '100%', borderRight: 0 }"
        >
          <a-sub-menu key="sub1">
            <span slot="title"><a-icon type="user" />subnav 1</span>
            <a-menu-item key="1">
              option1
            </a-menu-item>
            <a-menu-item key="2">
              option2
            </a-menu-item>
            <a-menu-item key="3">
              option3
            </a-menu-item>
            <a-menu-item key="4">
              option4
            </a-menu-item>
          </a-sub-menu>
          <a-sub-menu key="sub2">
            <span slot="title"><a-icon type="laptop" />subnav 2</span>
            <a-menu-item key="5">
              option5
            </a-menu-item>
            <a-menu-item key="6">
              option6
            </a-menu-item>
            <a-menu-item key="7">
              option7
            </a-menu-item>
            <a-menu-item key="8">
              option8
            </a-menu-item>
          </a-sub-menu>
          <a-sub-menu key="sub3">
            <span slot="title"><a-icon type="notification" />subnav 3</span>
            <a-menu-item key="9">
              option9
            </a-menu-item>
            <a-menu-item key="10">
              option10
            </a-menu-item>
            <a-menu-item key="11">
              option11
            </a-menu-item>
            <a-menu-item key="12">
              option12
            </a-menu-item>
          </a-sub-menu>
        </a-menu>
      </a-layout-sider>
      <a-layout style="padding: 0 24px 24px">
        <a-breadcrumb style="margin: 16px 0">
          <a-breadcrumb-item>Home</a-breadcrumb-item>
          <a-breadcrumb-item>List</a-breadcrumb-item>
          <a-breadcrumb-item>App</a-breadcrumb-item>
        </a-breadcrumb>
        <a-layout-content
          :style="{ background: '#fff', padding: '24px', margin: 0, minHeight: '280px' }"
        >
          Content
        </a-layout-content>
      </a-layout>
    </a-layout>
  </a-layout>
</template>
<script>
import Vue from 'vue'
import { Menu, Layout, Icon, Breadcrumb } from 'ant-design-vue'
Vue.use(Layout)
export default {

  components: {
    'a-menu': Menu,
    'a-icon': Icon,
    'a-breadcrumb': Breadcrumb,
    'a-breadcrumb-item': Breadcrumb.Item,
    ASubMenu: Menu.SubMenu,
    AMenuItem: Menu.Item

  },
  data () {
    return {
      collapsed: false
    }
  },
  methods: {
  }
}
</script>
<style>
#components-layout-demo-top-side-2 .logo {
  width: 120px;
  height: 31px;
  background: rgba(255, 255, 255, 0.2);
  margin: 16px 28px 16px 0;
  float: left;
}
</style>