title: How to add click event by class name?
body: <p>I have a example html menu:</p>
  
  <pre><code>&lt;div class="mmenu"&gt;
      &lt;ul&gt;
          &lt;li&gt;
              &lt;div  class="menu_button" id="m1" &gt;A&lt;/div&gt;
          &lt;/li&gt;
          &lt;li&gt;
              &lt;div  class="menu_button" id="m2" &gt;B&lt;/div&gt;
          &lt;/li&gt;
          &lt;li&gt;
              &lt;div  class="menu_button" id="m3" &gt;C&lt;/div&gt;
      &lt;/ul&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Can I add click event for each element of menu by class name ?</p>
  
  <pre><code> $('.menu_button').click(function() {
       if ( id == "m1" ) ....
   })
  </code></pre>