Whenever I click the toggle button, I notice that the menu (which I have set to appear on toggle) only shows for a brief moment before disappearing. As a beginner in bootstrap, I am sure I might have made some obvious mistakes. Any assistance would be greatly appreciated.
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<link rel="stylesheet" type="text/css" href="css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="css/style.css">
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"></script>
<script src="js/jquery.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<title></title>
</head>
<body>
<div class="container ">
<nav class="navbar navbar-expand-sm navbar-dark bg-dark">
<a href="#" class="navbar-brand"><img src="logo.png">The building co.</a>
<button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#myMenu">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="myMenu">
<ul class="navbar-nav">
<li class="nav-item" > <a href="#" class="navbar-link">Home </a> </li>
<li class="nav-item" > <a href="#" class="navbar-link">contact us </a> </li>
<li class="nav-item" > <a href="#" class="navbar-link">policy </a> </li>
<li class="nav-item" > <a href="#" class="navbar-link">terms </a> </li>
<li class="nav-item" > <a href="#" class="navbar-link">About us </a> </li>
</ul>
</div>
</nav>
</div>
</body>
</html>