基本命令

db.createUser({  user:'root',pwd:'root',roles:[ {  role:'userAdminAnyDatabase', db: 'test'},'readWriteAnyDatabase']});

db.createUser({"user":"root","pwd":"root","roles":[{role:"readWrite",db:"test"}]})

mongosh -u root -p root
show collections
db.xxx.drop()
 db.dropDatabase()