为什么不使用Bootstrap预定义的类输入块级别来完成这项工作呢?

<a href="#" class="btn input-block-level">Full-Width Button</a> <!-- BS2 -->
<a href="#" class="btn form-control">Full-Width Button</a> <!-- BS3 -->

<!-- And let's join both for BS# :) -->
<a href="#" class="btn input-block-level form-control">Full-Width Button</a>

在控制大小^部分了解更多信息。

Bootstrap / CSS

使用col-12, btn-block, w-100，形式控制或宽度:100%

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/> <button class="btn btn-success col-12"> class="col-12" </button> <button class="btn btn-primary w-100"> class="w-100" </button> <button class="btn btn-secondary btn-block"> class="btn-block" </button> <button class="btn btn-success form-control"> class="form-control" </button> <button class="btn btn-danger" style="width:100%"> style="width:100%" </button>

<div class="col-md-9">
    <button class="btn btn-block btn-primary" type="button">Block level button</button>
</div>

在Bootstrap 3中，这应该是您所需要的全部内容。我相信btn-large覆盖了btn-block的宽度。

在Bootstrap 5中，类btn-block不再工作。但是，您可以将类w-100添加到按钮中，使其与容器一样宽。

<link href=“https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta2/dist/css/bootstrap.min.css” rel=“stylesheet” /> <div class=“row”><div class=“ col-5 ”> <a class=“btn btn-outline-primary w-100 ” href=“# ”><span>Button 1</span></a> </div><div class=“col-5 ”> <a class=“ btn btn-primary w-100 weiss ” href=“# ”><span>Button 2</span></a> </div></div>

我简单地用了这个:

<div class="col-md-4 col-sm-4 col-xs-4">
<button type="button" class="btn btn-primary btn-block">Sign In</button>
</div>

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/> <button class="btn btn-success col-12"> class="col-12" </button> <button class="btn btn-primary w-100"> class="w-100" </button> <button class="btn btn-secondary btn-block"> class="btn-block" </button> <button class="btn btn-success form-control"> class="form-control" </button> <button class="btn btn-danger" style="width:100%"> style="width:100%" </button>