我正在创建一个bootstrap网站，并尝试使导航栏可折叠工作。导航切换按钮无论如何都会显示。当导航栏进入媒体时，如何限制它显示？
代码是：
Invoke-Expression
enter code here
答案 0 :(得分：0)
你使用nav的bootstrap 4代码并添加bootstrap 3的链接和脚本....
的 1。你可以添加bootstrap 4的链接/脚本然后它可以工作：
这是脚本/链接：
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
示例：
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<div style="background-color: black;">
<nav class="navbar navbar-expand-md bg-dark navbar-dark">
<div class="container">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsenavbar">
<span class="navbar-toggler-icon" style="background-color: black"></span>
</button>
<div class="collapse navbar-collapse text-center" id="collapsenavbar">
<ul class="nav navbar-nav">
<li class="nav-item">
<a href="" class="nav-link">Home</a>
</li>
<li class="nav-item">
<a href="" class="nav-link">The New Laws</a>
</li>
<li class="nav-item">
<a href="" class="nav-link">Get Qualified</a>
</li>
<li class="nav-item">
<a href="" class="nav-link">What Is Record Suspension</a>
</li>
<li class="nav-item">
<a href="" class="nav-link">Why Do I Need A Waiver</a>
</li>
</ul>
</div>
</div>
</nav>
</div>
<强> 2。你可以使用bootstrap 3：https://www.w3schools.com/Bootstrap/bootstrap_navbar.asp