node+mongoose实现删除父亲，所有有关系的跟着一起删除

router.delete('/menu/delete/:id', (req, res) => {
    var id = req.params.id
    vertoken.getToken(req.headers.token).then((data) => {
        if (data.identity == 99) {
            Menu.find({}, (err, info) => {
                var result = new Array();
                result.push(id)

                function getP(id, array) {
                    array.forEach(element => {
                        if (element.pid == id) {
                            result.push(element._id)
                            getP(element.id, array)
                        }
                    });
                }
                getP(id, info)
                // res.json(result.join(',')); //result 是所有的要删除的id
                let newResult = result.join(',')
                Menu.remove({ _id: { $in: result } }, (err, val) => {
                    if (val.deletedCount > 0) {
                        Role.find({ rules: { $regex: newResult } }, (err, role) => {
                            if (role != '') {
                                let array = new Array()
                                role.forEach((item, index) => {
                                    var a = (role[index].rules).split(',')
                                    var b = result
                                    var c = []
                                    var tmp = a.concat(b);
                                    var o = {};
                                    for (var i = 0; i < tmp.length; i++) {
                                        (tmp[i] in o) ? o[tmp[i]]++: o[tmp[i]] = 1;
                                    }
                                    for (x in o) {
                                        if (o[x] == 1) {
                                            c.push(x);
                                        }
                                    }
                                    array.push(c)
                                    Role.updateMany({ _id: item._id }, { $set: { rules: array[index].join(',') } }, function(err, doc) {
                                        if (doc) { console.log('成功执行了删除'); }
                                        if (err) { console.log(err); }
                                    })
                                })
                            }
                        })
                        res.json({
                            code: 200,
                            message: `成功删除了${val.deletedCount}条数据！`
                        })
                    } else {
                        res.json({
                            code: -1,
                            message: "没有要删除的数据或您已删除过！"
                        })
                    }

                })

            })
        } else {
            res.json({
                code: -1,
                message: "您没有删除权限！"
            })
        }

    }).catch((error) => {
        res.json({ code: 401, message: "token失效了" })
    })

})