考虑这些基本且相同的Bootstrap 3和Bootstrap 4示例。当在同一行内时，在引导程序3中，divA似乎根据其自身内容占用了所需的垂直空间，而在引导程序4中，divA的垂直跨度与divB的垂直跨度一样高，这取决于其内容。
Bootstrap 3中有没有一种方法可以让divA像v4+中那样工作？如何使同一行中的两个div具有相同(非固定(高度？
我读过关于Bootstrap 4+中断点更改的文章，但我找不到任何关于这些更改工作方式不同的信息。
我是不是错过了什么？
#divA {
background-color: red;
border: 1px solid black;
}
#divB {
border: 1px solid black;
}<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/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-xs-6" id="divA">
<span>B</span>
</div>
<div class="col-xs-6" id="divB">
<div>B</div>
<div>B</div>
<div>B</div>
<div>B</div>
<div>B</div>
<div>B</div>
<div>B</div>
</div>
</div>
</div>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>#divA {
background-color: red;
border: 1px solid black;
}
#divB {
border: 1px solid black;
}<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/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-sm-6" id="divA">
<span>B</span>
</div>
<div class="col-sm-6" id="divB">
<div>B</div>
<div>B</div>
<div>B</div>
<div>B</div>
<div>B</div>
<div>B</div>
<div>B</div>
</div>
</div>
</div>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>只需使用flex。
.d-flex {
display: flex;
}
.a {
background: red;
width: 30%;
}<div class="d-flex">
<div class="a">A</div>
<div class="b">
Lorem ipsum dolor sit amet consectetur adipisicing elit. Nulla soluta corporis, repellat architecto error voluptatibus neque vitae tempora laudantium saepe nostrum sint ipsam dignissimos recusandae magnam illo eveniet veritatis! Unde.
</div>
</div>