1.创建目录结构

进入cmd,先cd到项目目录（项目vue3-project）

cd vue3-project
mkdir -p src\\views\\home\\components\\menubar

2.创建组件文件

3.编辑menu-item-content.vue

<template>
	<template v-if="item.icon">
		<lay-icon :type="item.icon"></lay-icon>
	</template>
	{{ item.title }}
</template>

<script setup lang="ts">
import { computed } from 'vue';

const props= defineProps({
	// 菜单内容
	content: null,
});

// 获取父级菜单数据
const item = computed(() => {
	return props.content;
});

</script>
<style scoped lang="scss">

</style>

 4.编辑menu-item.vue

<template>
	<template v-if="item.children && item.children.length>0">
		<lay-sub-menu :id="item.path" >
			<template v-slot:title>
				<MenuItemContent :content="item" />
			</template>
			
			<o-menu v-for="data in item.children"  :content="data" />
		</lay-sub-menu>
	</template>
	<template v-else>
		<lay-menu-item :id="item.path" >
			<MenuItemContent :content="item" />
		</lay-menu-item>
	</template>
</template>

<script setup lang="ts">
import { computed } from 'vue';
import MenuItemContent from './menu-item-content.vue';

defineOptions({
		name:"OMenu"
	}
);
const props= defineProps({
	// 菜单内容
	content: null,
});

// 获取父级菜单数据
const item = computed(() => {
	return props.content;
});

</script>
<style scoped lang="scss">


</style>

5. 编辑menubar.vue

<template>
	<lay-menu  
			  v-model:selected-key="selectedKey"
			  v-model:open-keys="openKeys"
			  :tree="true" :indent="true"
			  :collapse="collapse"  @changeSelectedKey="changeSelectedKey">
		<template v-for="menu in menus">
			<MenuItem :content="menu" />
		</template>
	</lay-menu>
</template>

<script setup lang="ts">
import { ref } from 'vue';
import { storeToRefs } from 'pinia';
import { useRouter, useRoute } from 'vue-router'
import { useMenuStore } from '@/stores/menu'
import MenuItem from './menu-item.vue';

const menuStore = useMenuStore()
const { menus,collapse } = storeToRefs(menuStore)

const route = useRoute();
const router = useRouter()

const selectedKey = ref(route.path)
const openKeys = ref<string[]>([])

const changePath=()=>{
	let len = route.matched.length;
	if(len>1){
		for(var i=len-2;i>0;i--){
			openKeys.value.push(route.matched[i].path);
		}
	}
}

changePath();

const changeSelectedKey=(val: string)=>{
	router.push(val);
}

</script>
<style scoped lang="scss">

.layui-nav{
	background-color:var(--o-sidebar-bg-color);
}

.layui-nav-tree {
	width: var(--o-sidebar-width);
}

:deep(.layui-nav-item>a *){
	color:var(--o-sidebar-text-color);
}


:deep(.layui-nav-child){
	background-color:var(--o-sidebar-bg-color);
}


:deep(.layui-nav-item>a){
	display:flex;
	
}

</style>

6.添加菜单数据类型定义

types/menu.d.ts

declare interface Meta{
	id: string;
	name: string;
	path: string;
	title: string;
}

declare interface MenuMeta extends Meta{
	icon?: string;
}

declare interface MenuJsonInfo  extends MenuMeta{
	parentId: number;
}

declare interface MenuInfo extends MenuMeta{
	children?: MenuInfo[];
}

// 菜单信息
declare interface MenuInfoState {
  activeName: string;
  menu: MenuInfo;
}

7.添加store

stroes/menu.ts

import {defineStore} from 'pinia';

/**
 * 
 * @methods 设置菜单信息
 */
export const useMenuStore = defineStore('menu',{
	persist: true,//数据持久化设置
  state: (): MenuInfoState => ({
	collapse: false,
	menu: {
		name: '',
		title: '',
		path: '/',
		children: []
	},
  }),
  
  getters:{
	menus(state){
		return state.menu.children;
	}
  },
  actions: {

    async gen(datas: MenuJsonInfo[]) {
	  const that = this;
      const map:Record<number, MenuInfo> = {};
	  datas.forEach((item: MenuJsonInfo) =>{
		map[item.id] = {title:item.title,name:item.name, path:item.path,icon:item.icon, children: [] };
	  });

	  const findParent = (item: MenuJsonInfo)=>{
		  if(item.pid == 0 ){
				that.menu.children?.push(map[item.id]);
		  }else {
			  const parent = map[item.pid];
			  if(parent){
				  parent.children?.push(map[item.id]);
			  }
		  }
	  };
	  
	  datas.forEach((item: MenuJsonInfo) =>{
		  findParent(item);
	  });

    },
	handleCollape(){
		this.collapse = !this.collapse;
		return this.collapse;
	},
	clear(){
		this.menu.children =[];
	},

  },

  

});

展示菜单效果：