title: jQuery Remove second class
body: <p>For example: <code>&lt;h3 class="first second"&gt;Text&lt;/h3&gt;</code>
  How can remove html second class?</p>
  
  <p>Hope can see that <code>&lt;h3 class="first"&gt;Text&lt;/h3&gt;</code>
  I try the code but doesn't work.</p>
  
  <pre><code>$( "h3" ).removeClass( "first second" ).addClass( "first" );
  </code></pre>
  
  <p>Have any idea? Thanks!</p>