你可以这样做：-

DatabaseReference myRef = FirebaseDatabase.getInstance().getReference().child("Frist Child").child("Second Child");

我写了“/”给裁判，我得到了所有的东西。

const firebaseMain = firebase
      .app()
      .database('https://XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/')
      .ref('/');
      
      console.log("CHILDREN:");
      firebaseMain.ref.once('value', function(snapshot) {
        console.log(JSON.stringify(snapshot.val()));
        firebaseReferences=snapshot.val();
        console.log("\x1b[32m","references: --> TYPE"+typeof firebaseReferences );
      });