jQuery find ID of clicked button by class

With jQuery object (not necessary)

$(".vote").click(function(){
  var id = $(this).attr('id');
});

Without jQuery object (faster)

$(".vote").click(function(){
  var id = this.id;
});

$(".vote").click(function(){
     var id = this.id;
});

The ID is accessible directly from the element. There's absolutely no need to use a jQuery method.