gistfile1.js

'click .increment': function() {
  voteOnLeaderboard("players", function() {
    Players.update(this._id, {
      $inc: { score: 1 }
    });
  });
}

function voteOnLeaderboard(name, callback) {
  storage_name = "voted-on-" + name + "-leaderboard";
  if (localStorage.getItem(storage_name) != null) return false;
  localStorage.setItem(storage_name, true);
  callback()
}