為什么Bootstrap4和Bootstrap3中的列高度相等？-有解無憂

考慮這些基本且相同的 Bootstrap 3 和 Bootstrap 4 示例。當在同一行內時，Bootstrap 3divA似乎根據其自身的內容占用盡可能多的垂直空間，而在 Bootstrap 4 中，divA垂直跨度divB取決于其內容的高度。

Bootstrap 3 中是否有一種方法可以divA像在 v4 中那樣進行操作？如何使div同一行內的兩個s 具有相同（不固定）的高度？

我已經閱讀了有關 Bootstrap 4 中斷點更改的資訊，但我找不到任何關于這些作業為何不同的資訊。

我錯過了什么嗎？

#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>

uj5u.com熱心網友回復：

只需使用彈性。

.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>

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