ass="icon-bar"></span>
            </button>
            <!--<a class="navbar-brand" href="#"><img src="img/yhdlogo.jpg" data-active-url="img/yhdlogo.jpg" alt=""></a>-->
        </div>
        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav navbar-right main-nav">
                <li><a href="#intro">介绍</a></li>
                <li><a href="#example">Example</a></l