how to get textContent of textarea after change?
<p>I have a <code>textarea</code> tag. I want to be able to get its <code>textContent</code> after <code>textContent</code> changed?</p>

<pre><code>&lt;textarea id="xxx"&gt; sameple text &lt;/textarea&gt; // before
&lt;textarea id="xxx"&gt; sameple text and new text &lt;/textarea&gt; // after
</code></pre>

<p>I want listen even when the <code>textarea</code>'s content has changed.</p>