title: how to find or decrypt the url of javascript:void(0)
body: <p>well, I just downloaded a code from internet and it has </p>
  
  <pre><code>&lt;a href="javascript:void(0)" class="action"&gt;login&lt;/a&gt;
  </code></pre>
  
  <p>when i click on it, it shows a pop up.
  I want to use that pop on any other button , but does no know how to do that. can any one please explain me how it can be done or how the current given line is working.
  I am just new to this, so please dont be mad if it is a stupid question.
  Thank you</p>