引导程序对齐不起作用

Question

因此，我是Bootstrap的新手，我刚刚尝试了该文档中的示例之一，但未按预期显示。

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" integrity="sha384-WskhaSGFgHYWDcbwN70/dfYBj47jz9qbsMId/iRN3ewGhXQFZCSftd1LZCfmhktB"
    crossorigin="anonymous">

<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>
<div class="container">
    <div class="row">
        <div class="col align-self-start">
            One of three columns
        </div>
        <div class="col align-self-center">
            One of three columns
        </div>
        <div class="col align-self-end">
            One of three columns
        </div>
    </div>
</div>

输出应如下所示（如果看不到图像，则为三个div，“三列之一”与左上，中和右下对齐）

但是我得到的只是三个div并排。

有什么我想念的吗？

Answer 1

您需要为行提供高度-

<div class="row" style="height:500px;">

Answer 2

签出

<div class="container">
    <div class="row">
        <div class="col-md-4 align-self-start">
            One of three columns
        </div>
    </div>
    <div class="row">
      <div class="col-md-4 align-self-center">
      </div>
        <div class="col-md-4 align-self-center">
            One of three columns
        </div>
    </div>
    <div class="row">
      <div class="col-md-4 align-self-center">
      </div>
      <div class="col-md-4 align-self-center">
      </div>
        <div class="col-4 align-self-end">
            One of three columns
        </div>
      </div>
    </div>
</div>

让我知道这是否有效吗？

Answer 3

.align-self- *用于对齐弹性框

尝试一下；

<div class="container">

  <div class="d-flex bg-light" style="height:150px;">
    <div class=" align-self-start">Flex item 1</div>
    <div class=" align-self-center">Flex item 2</div>
    <div class=" align-self-end">Flex item 3</div>
  </div>

</div>