title: JQuery - Events binding and cached elements
body: <p>Having some code like this one</p>
  
  <pre><code>$a = $('#a');
  $b = $('#b');
  $c = $('#c');
  
  $('#a, #b, #c').keyup(function () {
      //Event handling
  });
  </code></pre>
  
  <p>I would like to know</p>
  
  <ol>
  <li>If it is possible to use existing cached elements to handle events instead of the selector.</li>
  <li>If this is possible and proper, does it make any difference?</li>
  </ol>