title: jQuery serializeArray() add another value on top for passing to Ajax
body: <p>I'm doing the following:</p>
  
  <pre><code>var data = $(form).serializeArray();
  // Now I want to  add another value on this data
  data.username = 'this is username';
  </code></pre>
  
  <p>I want to know how can I add another value after doing <code>serializeArray()</code>. I tried all the things I know, but nothing is getting it to work. any ideas pls.</p>