</span>
                </button>
                <a class="navbar-brand" href="index.html">Bootstrap</a>
            </div>
            <div id="navbar" class="collapse navbar-collapse">
                <ul class="nav navbar-nav">
                    <li><a href="top1.html">top1.html</a></li>
                    <li><a href="top2.html">top2.html</a></li>
                    <li><a href="top3.html">top3.html</a></li>
                    <li><a href="https://github.com/shihao316558512/bootstrap" target="_bla