汉堡菜单在iPhone上不起作用？

Question

Hamburger menu does not open upon touch on iphone mobile devices, but works on android devices. Browers I'm using is chrome & safari iphone 4s device.

How can I get my website mobile friendly on iphone devices using hamburger menu? here is the website: http://xavierbreaker.com/ Here is my code:

<div id="nav">
  <div class="navbar navbar-fixed-top navbar-inverse" data-spy="affix" data-offset-top="100">
    <div class="container">

      <div class="navbar-header">
        <a class="navbar-brand" href="#">xyz company</a>
        <a class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
        </a>
      </div>

      <div class="navbar-collapse collapse">
        <ul class="nav pull-right navbar-nav">
          <li><a href="index.html">Home</a></li>
          <li><a href="about.html">About</a></li>
          <li><a href="shows.html">Shows</a></li>
          <li class="dropdown">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Media<i class=""></i></a>
            <ul class="dropdown-menu" role="menu">
              <li><a href="gallery.html">Gallery</a></li>
              <li><a href="audiovisual.html">Audio/Visual</a></li>
              <li><a href="">Beats Coming Soon</a></li>
            </ul>
          </li>
          <li><a href="contact.html">Contact</a></li>
        </ul>
      </div>

    </div>
  </div>
</div>

Answer 1

I just tested the site using Safari and Chrome on my iPhone 5s and the hamburger menu works fine. I am unable to test on an iPhone 4s but I hope the previous helps.