firebase.js

var userName;

/* FACEBOOK LOGIN */
  var loginRef = new Firebase('https://phaser-flappy-bird.firebaseio.com/');
    var auth = new FirebaseSimpleLogin(loginRef, function(error, user) {
      if (error) {
        $('.facebook-status').html('Ocorreu algum erro, você não está logado no Facebook.');
        console.log(error);
      } else if (user) {
        // user authenticated with Firebase
        userName = user.name;
        console.log(user);
        $('.facebook-status').html('Você está logado no Facebook, ' + user.name + '.');
      } else {
        // user is logged out
      }
    });


  /* RANKING */
  var LEADERBOARD_SIZE = 10;

    // Create our Firebase reference
    var scoreListRef = new Firebase('https://phaser-flappy-bird.firebaseio.com//scoreList');

    // Keep a mapping of firebase locations to HTML elements, so we can move / remove elements as necessary.
    var htmlForPath = {};

    // Helper function that takes a new score snapshot and adds an appropriate row to our leaderboard table.
    function handleScoreAdded(scoreSnapshot, prevScoreName) {
      var newScoreRow = $("<tr/>");
      newScoreRow.append($("<td/>").append($("<em/>").text(scoreSnapshot.val().name)));
      newScoreRow.append($("<td/>").addClass('new-score').text(scoreSnapshot.val().score));

      // Store a reference to the table row so we can get it again later.
      htmlForPath[scoreSnapshot.name()] = newScoreRow;

      // Insert the new score in the appropriate place in the table.
      if (prevScoreName === null) {
        $("#leaderboardTable").append(newScoreRow);
      }
      else {
        var lowerScoreRow = htmlForPath[prevScoreName];
        lowerScoreRow.before(newScoreRow);
      }
    }

    // Helper function to handle a score object being removed; just removes the corresponding table row.
    function handleScoreRemoved(scoreSnapshot) {
      var removedScoreRow = htmlForPath[scoreSnapshot.name()];
      removedScoreRow.remove();
      delete htmlForPath[scoreSnapshot.name()];
    }

    // Create a view to only receive callbacks for the last LEADERBOARD_SIZE scores
    var scoreListView = scoreListRef.limit(LEADERBOARD_SIZE);

    // Add a callback to handle when a new score is added.
    scoreListView.on('child_added', function (newScoreSnapshot, prevScoreName) {
      handleScoreAdded(newScoreSnapshot, prevScoreName);
    });

    // Add a callback to handle when a score is removed
    scoreListView.on('child_removed', function (oldScoreSnapshot) {
      handleScoreRemoved(oldScoreSnapshot);
    });

    // Add a callback to handle when a score changes or moves positions.
    var changedCallback = function (scoreSnapshot, prevScoreName) {
      handleScoreRemoved(scoreSnapshot);
      handleScoreAdded(scoreSnapshot, prevScoreName);
    };
    scoreListView.on('child_moved', changedCallback);
    scoreListView.on('child_changed', changedCallback);

    // When the user presses enter on scoreInput, add the score, and update the highest score.
    var updateScore = function () {
        var newScore = game_score.player.score;
        var userScoreRef = scoreListRef.child(userName);

        scoreListRef.on('value', function(snapshot) {
          var userScore = snapshot.child(userName).val();

          if (userScore && userScore.score > newScore) return;
          // Use setWithPriority to put the name / score in Firebase, and set the priority to be the score.
          userScoreRef.setWithPriority({ name:userName, score:newScore }, newScore);
        });
    };