title: how to remove child(html elements) of div Id using jQuery
body: <p>I have</p>
  
  <pre><code>&lt;div id="myId"&gt;
     &lt;div&gt;aa&lt;/div&gt;
     &lt;h3&gt;hellow&lt;/h3&gt;
     &lt;a href="#"&gt;&lt;/a&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>So how to remove all content of Id "<code>myId</code>" Using jQuery?</p>
  
  <p>The result must be this:</p>
  
  <p><code>&lt;div id="myId"&gt;&lt;/div&gt;</code></p>