在 bootstrap-4 中，第一次单击选项卡菜单中的下拉菜单时，它工作正常，但之后就停止工作了。
<!-- Nav tabs -->
<ul class="nav nav-tabs" role="tablist">
<li class="nav-item">
<a class="nav-link active" href="#home" role="tab" data-toggle="tab">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#profile" role="tab" data-toggle="tab">Profile</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">Dropdown</a>
<div class="dropdown-menu">
<a class="dropdown-item" href="#action" data-toggle="tab">action</a>
<a class="dropdown-item" href="#action_2" data-toggle="tab">Another action</a>
</div>
</li>
</ul>
<!-- Tab panes -->
<div class="tab-content">
<div role="tabpanel" class="tab-pane active" id="home">
HOME
</div>
<div role="tabpanel" class="tab-pane" id="profile">
PROFILE
</div>
<div role="tabpanel" class="tab-pane" id="action">
ACTION 1
</div>
<div role="tabpanel" class="tab-pane" id="action_2">
ACTION 2
</div>
</div>
这是 Bootply 中的演示 http://www.bootply.com/DrcnERfrer
该问题似乎是由于未清除.active打开另一个选项卡时，从下拉项中获取类，因此使其突出显示并防止再次单击相同的下拉项。
根据解决方法问题 #17371 - 导航下拉选项卡错误 https://github.com/twbs/bootstrap/issues/17371，可以添加如下js，直到问题解决：
$('.nav-tabs').on('shown.bs.tab', 'a', function (e) {
if (e.relatedTarget) {
$(e.relatedTarget).removeClass('active');
}
})
堆栈片段中的演示
$('.nav-tabs').on('shown.bs.tab', 'a', function (e) {
if (e.relatedTarget) {
$(e.relatedTarget).removeClass('active');
}
})
<!-- 4.0.0-alpha.2 Libraries -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/css/bootstrap.min.css" >
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/js/bootstrap.min.js"></script>
<!-- Nav tabs -->
<ul class="nav nav-tabs" role="tablist">
<li class="nav-item">
<a class="nav-link active" href="#home" role="tab" data-toggle="tab">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#profile" role="tab" data-toggle="tab">Profile</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">Dropdown</a>
<div class="dropdown-menu">
<a class="dropdown-item" href="#action" data-toggle="tab">action</a>
<a class="dropdown-item" href="#action_2" data-toggle="tab">Another action</a>
</div>
</li>
</ul>
<!-- Tab panes -->
<div class="tab-content">
<div role="tabpanel" class="tab-pane active" id="home">
HOME
</div>
<div role="tabpanel" class="tab-pane" id="profile">
PROFILE
</div>
<div role="tabpanel" class="tab-pane" id="action">
ACTION 1
</div>
<div role="tabpanel" class="tab-pane" id="action_2">
ACTION 2
</div>
</div>
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