这个
btn-outline-secondary
类别和
btn-outline-light
Bootstrap 4中的类是与过去最接近的两个选项
btn-default
在Bootstrap 3中。(Bootstrap 4中没有确切的等效项)
下面是一个带有实时预览的代码片段(请注意
button
和
a
标记):
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<div class="container m-3">
<a class="btn btn-outline-secondary">outline-secondary link</a>
<button type="button" class="btn btn-outline-secondary">outline-secondary 'button'</button>
<br><br>
<a class="btn btn-outline-light">outline-light link</a>
<button type="button" class="btn btn-outline-light">outline-light 'button'</button>
</div>
参考号:
https://getbootstrap.com/docs/4.0/components/buttons/#outline-buttons