bootstrap 菜单

    <header role="banner">
        <nav role="navigation" class="navbar navbar-static-top navbar-default">
          <div class="container">
            <div class="navbar-header">
              <button type="button" 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>
              </button>
              <a class="navbar-brand" href="index.html"><img src="img/logo.png" alt="Bootstrappin'" width="120"></a>
            </div>
            <div class="navbar-collapse collapse">
              <ul class="nav navbar-nav">
                <li class="active"><a href="index.html">
                    <span class="icon fa fa-home"></span> Home
                </a></li>
                <li><a href="#">
                    <span class="icon fa fa-desktop"></span> Portfolio
                </a></li>
                <li><a href="#">
                    <span class="icon fa fa-group"></span> Team
                </a></li>
                <li><a href="#">
                    <span class="icon fa fa-envelope"></span> Contact
                </a></li>
              </ul>
            </div><!--/.nav-collapse -->
          </div><!--/.container -->
        </nav>
    </header>