get last value from textbox?

get last value from textbox?

When someone hits enter I want the last value of textbox with id keywords How can I do it?
  1. $(document).ready(function() {
  2. $('#keywords').keyup(function(e) {
  3.   if(e.keyCode == 13) {
  4.     alert($('#keywords').val());
  5.     }
  6. });