<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">

<div class="container">

<!--折叠显示图标-->

    <div class="navbar-header">

        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#a">

            <span class="sr-only">Toggle navigation</span>

            <span class="icon-bar"></span>

            <span class="icon-bar"></span>

            <span class="icon-bar"></span>

        </button>

        <a href="#" class="navbar-brand">tinyphp</a>

    </div>

    <!--导航折叠-->

    <div class="collapse navbar-collapse" id="a">

        <ul class="nav navbar-nav">

            <li class="active">

                <a href="#">Home</a>

            </li>

            <li class="dropdown">

                <a href="#" class="btn dropdown-toggle" data-toggle="dropdown" >Address <span class="caret"></span></a>

                <ul class="dropdown-menu" role="menu">

                    <li><a href="#">Action</a></li>

                    <li><a href="#">Another action</a></li>

                    <li><a href="#">Something else here</a></li>

                    <li class="divider"></li>

                    <li><a href="#">Separated link</a></li>

                </ul>

            </li>

        </ul>

    </div>

</div>

</nav>