title: What does " [native code] " mean?
body: <p>I tried to investigate the jQuery code, so I used this:</p>
  
  <pre><code>document.write($.constructor);
  </code></pre>
  
  <p><a href="http://jsfiddle.net/WZGWp/">jsfiddle</a>    </p>
  
  <p>I got this result:</p>
  
  <pre><code>function Function() { [native code] }
  </code></pre>
  
  <p>What does <code>[native code]</code> mean? Why can't I see the real code?</p>
  
  <p><sub> Tested with <code>Google-Chrome</code> </sub></p>