mongodb连接数据库的用户权限不够怎么解决？

# 启动数据库

mongod --dbpath /Users/joyce/mongodb/db --auth

# 连接数据库

mongo

#使用数据表

use admin

#创建超级用户管理员

db.createUser({

    user:'myUserAdmin',

    pwd:'password',

    roles:[

        {

            role:'userAdminAnyDatabase',

            db:'admin'

        }

    ]

})

#给数据表创建用户

use dbname

db.createUser({

    user:'username',

    pwd:'password',

    roles:[

    {

        role:'readWrite',

        db:'dbname'

    },

    {

        role:'Read',

        db:'dbname'

    }

    ]

})

let dbUrl = "mongodb://username:password@ip:27017/dbname";

mongoose.connect(dbUrl, { useNewUrlParser: true });