我正在尝试在引导程序4中实现卡片组功能，以使我所有的卡片都具有相同的高度。

引导程序提供的示例显示了4张漂亮的卡片，但是无论视口如何，它都是4张卡片。

这对我来说没有意义，因为我认为您希望缩小卡的最小尺寸，以使内容看起来仍然不错。

然后，我尝试添加一些视口类以打破屏幕尺寸，但是一旦添加了该div，卡片组将不再适用，因此不会使卡片的高度相等。

我怎样才能做到这一点？这是缺少的功能，将在完整版的Bootstrap 4中解决吗？

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          <p>It's really good news that the new Bootstrap 4 now has support for CSS 3 flexbox.</p>
          <footer>Makes flexible layouts <cite title="Source Title">Faster</cite></footer>
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          <p>The Bootstrap 3.x element that was called "Panel" before, is now called a "Card".</p>
          <footer>All of this makes more <cite title="Source Title">Sense</cite></footer>
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          <p>There are also some interesting new text classes for uppercase and capitalize.</p>
          <footer>These handy utilities make it <cite title="Source Title">Easy</cite></footer>
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          <p>If you want to use cool icons in Bootstrap 4, you'll have to find your own such as Font Awesome or Ionicons.</p>
          <footer>The Glyphicons are not <cite title="Source Title">Included</cite></footer>
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        <div class="card card-inverse card-success text-center col-xs-6 col-sm-4 col-md-3 col-lg-2 col-xl-1">
      <div class="card-block">
        <blockquote class="card-blockquote">
          <p>It's really good news that the new Bootstrap 4 now has support for CSS 3 flexbox.</p>
          <footer>Makes flexible layouts <cite title="Source Title">Faster</cite></footer>
        </blockquote>
      </div>
    </div>
    <div class="card card-inverse card-danger text-center col-xs-6 col-sm-4 col-md-3 col-lg-2 col-xl-1">
      <div class="card-block">
        <blockquote class="card-blockquote">
          <p>The Bootstrap 3.x element that was called "Panel" before, is now called a "Card".</p>
          <footer>All of this makes more <cite title="Source Title">Sense</cite></footer>
        </blockquote>
      </div>
    </div>
    <div class="card card-inverse card-warning text-center col-xs-6 col-sm-4 col-md-3 col-lg-2 col-xl-1">
      <div class="card-block">
        <blockquote class="card-blockquote">
          <p>There are also some interesting new text classes for uppercase and capitalize.</p>
          <footer>These handy utilities make it <cite title="Source Title">Easy</cite></footer>
        </blockquote>
      </div>
    </div>
    <div class="card card-inverse card-info text-center col-xs-6 col-sm-4 col-md-3 col-lg-2 col-xl-1">
      <div class="card-block">
        <blockquote class="card-blockquote">
          <p>If you want to use cool icons in Bootstrap 4, you'll have to find your own such as Font Awesome or Ionicons.</p>
          <footer>The Glyphicons are not <cite title="Source Title">Included</cite></footer>
        </blockquote>
      </div>
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