bootstrap 4 轮播标题在小型设备上不可见

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，carousal 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carousel-caption 类中删除d-none d-md-block 类，d-none 类为标题显示无，d-md-block 类为 md 及以上屏幕显示块。

注意：如果您的字幕中有很多文字，您可能需要调整小屏幕上的文字大小以使所有内容都适合。

Answer 2

这是你应该做的：

1. 删除类d-none.
2. 删除类d-md-block.

与 Bootstrap 轮播的 carousel-caption 类相关。

Answer 3

实际上，只需删除“d-none”类即可。