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Menu with Bootstrap does not work responsibly.
<!DOCTYPE html>
<html>
<head>
<title>Nome da Loja</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="css/bootstrap.min.css">
<meta name="viewport" content="width=device-width">
<script src="js/bootstrap.js"></script>
<script src='http://code.jquery.com/jquery-2.1.3.min.js'></script>
</head>
<body>
<header>
<nav class="navbar navbar-inverse">
<div class="navbar-header">
<a href="#" class="navbar-brand">Store</a>
<button class="navbar-toggle" type="button" data-target=".navbar-collapse" data-toggle="collapse">Menu</button>
</div>
<div class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li><a href="#">Novidades</a></li>
<li><a href="#">Mais vendidos</a></li>
</ul>
</div>
</nav>
</header>
The correct problem is in the js declaration of the page, your bootstrap.js is coming first, but it depends on jquery-2.1.3.min. js that is being declared later, because this by clicking on the burger menu is not opening.
– Edvaldo Farias