title: How to get next li data value with jquery?
body: <pre><code>&lt;ul&gt;
    &lt;li class="x active" data-title="a"&gt;&lt;/li&gt;
    &lt;li class="x" data-title="b"&gt;&lt;/li&gt;
    &lt;li class="x" data-title="c"&gt;&lt;/li&gt;
    &lt;li class="x" data-title="d"&gt;&lt;/li&gt;
  &lt;/ul&gt;
  
  &lt;button id="btn1"&gt;Click me to get next data-title&lt;/button&gt;
  </code></pre>
  
  <p>if current active li has data-title of "a", how do i get the next li's data-title which is "b"?</p>