导航条

<nav class="navbar navbar-default">
    <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">

            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <div class="navbar-header">
                <img alt="Brand" src="../image/logoMsg.png" />
            </div>

        </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">
                <li class="active"><a href="#">首页 <span class="sr-only">(current)</span></a></li>
                <li><a href="#">演出</a></li>
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
                    <ul class="dropdown-menu">
                        <li><a href="#">Action</a></li>
                        <li><a href="#">Another action</a></li>
                        <li role="separator" class="divider"></li>
                        <li><a href="#">Something else here</a></li>
                    </ul>
                </li>
            </ul>
            <div class="nav navbar-nav navbar-right">
                <li class="navbar-link"><a href="#">登陆</a></li>
                <li class="navbar-link"><a href="#">注册</a></li>
            </div>
            <form  class="navbar-form navbar-right">
                <div class="input-group navbar-input">
                    <input type="text" placeholder="请输入要搜索的内容" class="form-control " />
              <span class="input-group-btn">
              <input type="button" class="btn btn-default " value="搜索"/>
               </span>
                </div>
            </form>

        </div><!-- /.navbar-collapse -->
    </div><!-- /.container-fluid -->
</nav>