首先html布局
<ul id=”abc”>

</ul>
菜单json
const menuList = [

    {
        title: '首页',
        key: '/home'
    },
    {
        title: 'UI',
        key: '/ui',
        children: [
            {
                title: '按钮',
                key: '/ui/buttons',
            },
            {
                title: '弹框',
                key: '/ui/modals',
            },
            {
                title: 'Loading',
                key: '/ui/loadings',
            },
            {
                title: '通知提醒',
                key: '/ui/notification',
            },
            {
                title: '全局Message',
                key: '/ui/messages',
            },
            {
                title: 'Tab页签',
                key: '/ui/tabs',
            },
            {
                title: '图片画廊',
                key: '/ui/gallery',
            },
            {
                title: '轮播图',
                key: '/ui/carousel',
            }
        ]
    },
    {
        title: '表单',
        key: '/form',
        children: [
            {
                title: '登录',
                key: '/form/login',
            },
            {
                title: '注册',
                key: '/form/reg',
            }
        ]
    },
    {
        title: '表格',
        key: '/table',
        children: [
            {
                title: '基础表格',
                key: '/table/basic',
            },
            {
                title: '高级表格',
                key: '/table/high',
            }
        ]
    },
    {
        title: '富文本',
        key: '/rich'
    },
    {
        title: '城市管理',
        key: '/city'
    },
    {
        title: '订单管理',
        key: '/order',
        btnList: [
            {
                title: '订单详情',
                key: 'detail'
            },
            {
                title: '结束订单',
                key: 'finish'
            }
        ]
    },
    {
        title: '员工管理',
        key: '/user'
    },
    {
        title: '车辆地图',
        key: '/bikeMap'
    },
    {
        title: '图标',
        key: '/charts',
        children: [
            {
                title: '柱形图',
                key: '/charts/bar'
            },
            {
                title: '饼图',
                key: '/charts/pie'
            },
            {
                title: '折线图',
                key: '/charts/line'
            },
        ]
    },
    {
        title: '权限设置',
        key: '/permission'
    },
];

js逻辑
var ul=”;

function appednMenu(data) {
    data.forEach(function (item,index) {
        if(item.children){
            ul+='<li>'+item.title+'<ul>'
                    appednMenu(item.children);
            ul+='</ul></li>';
        }else {
            ul+='<li>'+item.title+'</li>'
        }
    })
}
appednMenu(menuList);
console.log(ul);
document.getElementById('abc').innerHTML=ul
最后样式
![图片描述][1]

没有写样式 简易版本的菜单栏