title: All my javascript added some code at bottom
body: <p>My website uses CodeIgniter. Today I found my website has some added code at the bottom of all the JavaScript files, including the jQuery file. The code is like this:</p>
  
  <pre><code>/*4fd970*/
  
  You are blocked by day limit
  /*/4fd970*/
  </code></pre>
  
  <p>My folders permission is set to 755.</p>
  
  <ul>
  <li>I wonder why this code is being added to my file? Has someone hacked my site?</li>
  <li>Is it caused by my server?</li>
  </ul>