我已经从Bootsrap页面复制了该导航栏，并且collpase按钮无法正常工作，为什么？
<nav class="navbar navbar-inverse">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a href="index.html"><img class="block" id="logo" src="images/logo.png"></a>
</div>
<div class="collapse navbar-collapse" id="myNavbar">
<ul class="nav navbar-nav navbar-right">
<li class="active"><a href="#">VGO</a></li>
<li><a href="vIRL.html">vIRL</a></li>
<li><a href="csgo.html">CS:GO</a></li>
<li><a href="trading.html">TRADING</a></li>
<li><a href="cashout.html">CASHOUT</a></li>
<li><a href="about.html">ABOUT</a></li>
</ul>
</div>
</div>
</nav>