javascript - how to Retrieve firebase database start from bottom to up?

Question

I have a set of items in firebase realtime, when i Retrieve data the old data appears at the first. Already i tried

    Firebase.database().ref().child('chains').orderByKey().startAt();

• but the data didn't appear

I want upload new item and it appear at the first how do i do this?

this my code:

this my database

Answer 1

Waitting for answers