引导轮播图像高度

Question

我在使用 bootstrap v4 图像轮播中的图像时遇到了一些问题。如果我缩小浏览器宽度，图像的高度保持不变，但图像的宽度变小，因此图像在高度上变得非常拉伸。

我一直在 stackoverflow 上查看类似的线程，并尝试了我在 cmets 中找到的所有内容，但它仍然无法正常工作。所以我决定写一个关于这个的新帖子。

这是一个 codepen 链接 https://codepen.io/anon/pen/owNyyx 但如果您不想访问 codepen，我也将代码粘贴在这里 :)

这是我的代码

<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
  <ol class="carousel-indicators">
    <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
  </ol>
  <div class="carousel-inner" role="listbox">
    <div class="carousel-item active">
      <img class="d-block img-fluid" src="images/image1.png" alt="First slide">
      <div class="carousel-caption d-none d-md-block">
        <h3>Random Title for image1</h3>
        <p>Random description1</p>
      </div>
    </div>
    <div class="carousel-item">
      <img class="d-block img-fluid" src="images/image2.png" alt="Second slide">
      <div class="carousel-caption d-none d-md-block">
        <h3>Random title for image2</h3>
        <p>Random description2</p>
      </div>
    </div>
    <div class="carousel-item">
      <img class="d-block img-fluid" src="images/image3.png" alt="Third slide">
      <div class="carousel-caption d-none d-md-block">
        <h3>Random title for image3</h3>
        <p>Random description3</p>
      </div>
    </div>
  </div>
  <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>
  </a>
  <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>

Answer 1

这是因为 img 父级 .carousel-item 是 display: flex 而 img 是一个 flex-child，所以它通过父级上的默认 align-items: stretch “拉伸”。

您可以通过多种方式解决此问题。最简单的可能是给align-items 一个不同于stretch 的值。

或者，如果您不想应用自定义 CSS 并将更改保留在标记中，请将每个 img 包装在块元素中，例如 div 或 figure 或任何适合您网站的元素。

.carousel-item {
  align-items: flex-start;
}

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">

<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
  <ol class="carousel-indicators">
    <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
  </ol>
  <div class="carousel-inner" role="listbox">
    <div class="carousel-item active">
      <img class="d-block img-fluid" src="http://lorempixel.com/1900/500" alt="First slide">
      <div class="carousel-caption d-none d-md-block">
        <h3>Cheap prizes for hairstyling</h3>
        <p>Good prizes to style your hair</p>
      </div>
    </div>
    <div class="carousel-item">
      <img class="d-block img-fluid" src="http://lorempixel.com/1900/500/cats/2" alt="Second slide">
      <div class="carousel-caption d-none d-md-block">
        <h3>3 Years of experience as Hairstylist</h3>
        <p>Awesome results !</p>
      </div>
    </div>
    <div class="carousel-item">
      <img class="d-block img-fluid" src="http://lorempixel.com/1900/500/cats/3" alt="Third slide">
      <div class="carousel-caption d-none d-md-block">
        <h3>Some random caption text</h3>
        <p>Some random description</p>
      </div>
    </div>
  </div>
  <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>
  </a>
  <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>