$('.views-field-field-jtc-top .field-content').each(function() {
  var  $this    = $(this),
       _index   = parseInt($this.val()) - 1,
       _classes = ['first-rating', 'second-rating', 'third-rating'];
       //console.log (_classes[_index]);
     if (_classes[_index]) {
  	     $this.addClass(_classes[_index]);  
     } else {
          $this.addClass('other-rating'); 
     }
});