What are these mysterious methods of a javascript exception?
<p>I examined a javascript exception in Google Chrome.</p>

<p><img src="http://i.stack.imgur.com/jvEPK.png" alt="enter image description here"></p>

<p>And I noticed the functions <code>get message</code>, <code>get stack</code>, <code>set message</code>, and <code>set stack</code>. I tried catching this exception and running <code>alert(e.get_message());</code> only to get an error. I also tried to run <code>alert(e.get message());</code>, which obviously returned another error due to the space.</p>

<p>What are these mysterious methods, and how does a developer call them?</p>
