1.初始化

const handleDB = require('../handleDB/index')
// 获取全部导航
exports.allNav = (req, res) => {(async function () {})()
}
// 更新或者添加导航
exports.upNav = (req, res) => {(async function () {})()
}
// 根据id删除
exports.delNav = (req, res) => {(async function () {})()
}

2.数据库设计