使用bootstrap v4选项卡时，当我使用前导数字作为选项卡ID时，选项卡的内容不会切换。其他选项卡正常工作。带有前导数字的选项卡将切换到活动状态，但相应的内容不会显示。
这是一个错误，还是我忽略了什么？
这段代码几乎完全取自bootstrap文档，我刚刚在第二个标签中添加了一个前导数字：
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
</head>
<body>
<ul class="nav nav-tabs" role="tablist">
<li class="nav-item">
<a class="nav-link active" data-toggle="tab" href="#home" role="tab">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" data-toggle="tab" href="#2-profile" role="tab">2-Profile</a>
</li>
<li class="nav-item">
<a class="nav-link" data-toggle="tab" href="#messages" role="tab">Messages</a>
</li>
<li class="nav-item">
<a class="nav-link" data-toggle="tab" href="#settings" role="tab">Settings</a>
</li>
</ul>
<div class="tab-content">
<div class="tab-pane active" id="home" role="tabpanel">... home</div>
<div class="tab-pane" id="2-profile" role="tabpanel">... profile</div>
<div class="tab-pane" id="messages" role="tabpanel">... messages</div>
<div class="tab-pane" id="settings" role="tabpanel">... settings</div>
</div>
<!-- jQuery first, then Tether, then Bootstrap JS. -->
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
</body>
</html>