title: how to find <ul> within <li> then add class to <li>
body: <pre><code>&lt;ul&gt;
  &lt;li&gt;nav&lt;/li&gt;
  &lt;li&gt;nav&lt;/li&gt;
  &lt;li&gt;nav&lt;/li&gt;
  &lt;li class="how do i addClass here"&gt;nav "how to addClass with in this li"
   &lt;ul&gt;
       &lt;li&gt;nav&lt;/li&gt;
       &lt;li&gt;nav&lt;/li&gt;
       &lt;li class="how do i addClass here"&gt;nav "how to addClass with in this li"
            &lt;ul&gt;
               &lt;li&gt;nav&lt;/li&gt;
               &lt;li&gt;nav&lt;/li&gt;
               &lt;li&gt;nav&lt;/li&gt;
           &lt;/ul&gt;
       &lt;/ul&gt;
   &lt;/li&gt;
   &lt;/ul&gt;
  </code></pre>