title: why is a comma used before "contents"
body: <p>I saw the following snippet in a jquery code, but I don't understand why it uses a comma right before 'contents' instead of a period.</p>
  
  <pre><code>var that = $(this),
  contents = that.serialize();
  </code></pre>
  
  <p>Does anyone have an idea why a comma is being used? </p>
  
  <p>I am missing the words to search properly I think.</p>