Bootstrap5 延伸链接（Stretched link）

在链接中添加.stretched-link，通过::after伪元素使其包含的块可以被点击。在大多数情况下，这意味着包含.stretched-link类链接的position: relative;的元素是可以点击的。

Card在Bootstrap中默认是position: relative，所以在这种情况下，你可以安全地将.stretched-link类添加到卡片中的链接中，而无需进行其他任何HTML更改。

不建议在使用拉伸链接时使用多个链接和点击目标。但是，如果需要的话，可以使用position和z-index可以帮助解决这个问题。

<div class="card" style="width: 18rem;">
  <img src="..." class="card-img-top" alt="...">
  <div class="card-body">
    <h5 class="card-title">Card with stretched link</h5>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    <a href="#" class="btn btn-primary stretched-link">Go somewhere</a>
  </div>
</div>

在线运行

<div class="d-flex position-relative">
  <img src="..." class="flex-shrink-0 me-3" alt="...">
  <div>
    <h5 class="mt-0">Custom component with stretched link</h5>
    <p>This is some placeholder content for the custom component. It is intended to mimic what some real-world content would look like, and we're using it here to give the component a bit of body and size.</p>
    <a href="#" class="stretched-link">Go somewhere</a>
  </div>
</div>

在线运行

<div class="row g-0 bg-light position-relative">
  <div class="col-md-6 mb-md-0 p-md-4">
    <img src="..." class="w-100" alt="...">
  </div>
  <div class="col-md-6 p-4 ps-md-0">
    <h5 class="mt-0">Columns with stretched link</h5>
    <p>Another instance of placeholder content for this other custom component. It is intended to mimic what some real-world content would look like, and we're using it here to give the component a bit of body and size.</p>
    <a href="#" class="stretched-link">Go somewhere</a>
  </div>
</div>

在线运行

识别包含块

如果拉伸的链接似乎不起作用，那么可能是包含块的原因。以下CSS属性将使一个元素成为包含块。

• 除static以外的position值
• 除none外的transform或perspective值
• transform或perspective的will-change值；
• 除none以外的filter值或will-change值为filter(仅在Firefox上有效)

<div class="card" style="width: 18rem;">
  <img src="..." class="card-img-top" alt="...">
  <div class="card-body">
    <h5 class="card-title">Card with stretched links</h5>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    <p class="card-text">
      <a href="#" class="stretched-link text-danger" style="position: relative;">Stretched link will not work here, because <code>position: relative</code> is added to the link</a>
    </p>
    <p class="card-text bg-light" style="transform: rotate(0);">
      This <a href="#" class="text-warning stretched-link">stretched link</a> will only be spread over the <code>p</code>-tag, because a transform is applied to it.
    </p>
  </div>
</div>

在线运行