data target hamburger bootstrap

1<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
2<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
3<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
4
5<nav class="navbar navbar-inverse navbar-static-top" role="navigation">
6  <div class="container">
7    <div class="navbar-header">
8      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
9                    <span class="sr-only">Toggle navigation</span>
10                    <span class="icon-bar"></span>
11                    <span class="icon-bar"></span>
12                    <span class="icon-bar"></span>
13                </button>
14    </div>
15
16    <!-- Collect the nav links, forms, and other content for toggling -->
17    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
18      <ul class="nav navbar-nav">
19        <li><a href="index.php">Home</a></li>
20        <li><a href="about.php">About</a></li>
21        <li><a href="#portfolio">Portfolio</a></li>
22        <li><a href="#">Blog</a></li>
23        <li><a href="contact.php">Contact</a></li>
24      </ul>
25    </div>
26  </div>
27</nav>

1sdfghjkl