carousel - 在小型设备上看不到bootstrap 4轮播字幕

Question

我正在练习http://v4-alpha.getbootstrap.com/examples/中给出的bootstrap 4 carousal示例。在移动或小屏幕上测试时，轮播字幕不可见。请帮忙。

 <div id="myCarousel" class="carousel slide" data-ride="carousel">
 <ol class="carousel-indicators">
 <li data-target="#myCarousel" data-slide-to="0" class="active"></li>
 <li data-target="#myCarousel" data-slide-to="1"></li>
 <li data-target="#myCarousel" data-slide-to="2"></li>
 </ol>
 <div class="carousel-inner" role="listbox">
 <div class="carousel-item active">
 <img class="first-slide" src="data:image/gif;base64,R0lGODlhAQABAIAAAHd3dwAAACH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==" alt="First slide">
 <div class="container">
 <div class="carousel-caption d-none d-md-block text-left">
 <h1>Example headline.</h1>
 <p>Cras justo odio, dapibus ac facilisis in, egestas eget quam. Donec id elit non mi porta gravida at eget metus. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
 <p><a class="btn btn-lg btn-primary" href="#" role="button">Sign up today</a></p>
 </div>
 </div>
 </div>
 <div class="carousel-item">
 <img class="second-slide" src="data:image/gif;base64,R0lGODlhAQABAIAAAHd3dwAAACH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==" alt="Second slide">
 <div class="container">
 <div class="carousel-caption d-none d-md-block">
 <h1>Another example headline.</h1>
 <p>Cras justo odio, dapibus ac facilisis in, egestas eget quam. Donec id elit non mi porta gravida at eget metus. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
 <p><a class="btn btn-lg btn-primary" href="#" role="button">Learn more</a></p>
 </div>
 </div>
 </div>
 <div class="carousel-item">
 <img class="third-slide" src="data:image/gif;base64,R0lGODlhAQABAIAAAHd3dwAAACH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==" alt="Third slide">
 <div class="container">
 <div class="carousel-caption d-none d-md-block text-right">
 <h1>One more for good measure.</h1>
 <p>Cras justo odio, dapibus ac facilisis in, egestas eget quam. Donec id elit non mi porta gravida at eget metus. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
 <p><a class="btn btn-lg btn-primary" href="#" role="button">Browse gallery</a></p>
 </div>
 </div>
 </div>
 </div>
 <a class="carousel-control-prev" href="#myCarousel" 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="#myCarousel" 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

从所有d-none d-md-block类中删除carousel-caption类，d-none类为标题提供无显示，而d-md-block类为其提供md和以上屏幕的块显示。

注意:如果字幕中包含大量文本，则可能需要在较小的屏幕上调整文本大小，以使所有内容都适合。