页面变小时显示三条横线,但是点击没反应,导航出不来
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<html lang="zh-cn">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>浏览器博物馆</title>
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<body>
<nav class="nav navbar-default" role="navigation">
<div class="container-fluid">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<span class="sr-only">Toggle navgation</span>
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</button>
<a href="#" class="navbar-brand">Brand</a>
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</body>
</html>