html - 如何在大屏幕上缩小 bootstrap 4 轮播图像

Question

我正在尝试在我的小元素中使用 bootstrap 4 carousel。我使用了他们网站上提供的示例代码，转载如下。当我从手机上查看网站时，正如预期的那样完美。然而，在膝上型电脑屏幕上， slider 图像占屏幕的一半——非常大。即使我缩小了浏览器(chrome 和 Firefox)，图像仍然和原来一样大。我尝试在 CSS 文件中进行媒体查询，如下所示:

@media only screen and (min-width: 768px) {
 .myCarousel .carousel .carousel-inner .img {
height: 250px;}
}

然而，它并没有起作用。以下是供您引用的 HTML 代码:

       <div class="myCarousel">
        <div id="carouselCaptions" class="carousel slide" data-ride="carousel">
            <ol class="carousel-indicators">
                <li data-target="#carouselCaptions" data-slide-to="0" class="active"></li>
                <li data-target="#carouselCaptions" data-slide-to="1"></li>                  
            </ol>
            <div class="carousel-inner">
                <div class="carousel-item active" data-interval="2000">
                    <img src="{% static 'img/slider/slide1.jpg' %}" class="d-block w-100" alt="">
                    <div class="carousel-caption">
                       <h5>First Slide Caption</h5>
                    </div>
                </div>
                <div class="carousel-item" data-interval="2000">
                    <img src="{% static 'img/slider/slide2.png' %}" class="d-block w-100" alt="">
                    <div class="carousel-caption">
                       <h5>Second Slide Caption</h5>
                    </div>
                </div>
            </div>
            <a class="carousel-control-prev" href="#carouselCaptions" 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="#carouselCaptions" role="button" data-slide="next">
                <span class="carousel-control-next-icon" aria-hidden="true"></span>
                <span class="sr-only">Next</span>
            </a>
        </div>
    </div>

非常感谢您的帮助。

Answer 1

按照示例，我更新了带高度调整的旋转木马 slider 。根据您的要求，可选择调整媒体查询宽度和轮播 slider 高度。

.carousel .carousel-item img {
    height: 200px;
    object-fit: cover;
}

@media (min-width: 768px) {
.carousel .carousel-item img {
    height: 350px;
    object-fit: cover;
}
}

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>

<div class="myCarousel">
    <div id="carouselCaptions" class="carousel slide" data-ride="carousel">
        <ol class="carousel-indicators">
            <li data-target="#carouselCaptions" data-slide-to="0" class="active"></li>
            <li data-target="#carouselCaptions" data-slide-to="1"></li>
        </ol>
        <div class="carousel-inner">
            <div class="carousel-item active" data-interval="2000">
                <img src="https://via.placeholder.com/1920x650" class="d-block w-100" alt="">
                <div class="carousel-caption">
                    <h5>First Slide Caption</h5>
                </div>
            </div>
            <div class="carousel-item" data-interval="2000">
                <img src="https://via.placeholder.com/1920x750" class="d-block w-100" alt="">
                <div class="carousel-caption">
                    <h5>Second Slide Caption</h5>
                </div>
            </div>
        </div>
        <a class="carousel-control-prev" href="#carouselCaptions" 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="#carouselCaptions" role="button" data-slide="next">
            <span class="carousel-control-next-icon" aria-hidden="true"></span>
            <span class="sr-only">Next</span>
        </a>
    </div>
</div>