javascript - Bootstrap 4 旋转木马不会缩小以适应视口(viewport)

Question

我是网络开发的新手，自学了一年，最近开始了 udacity 纳米学位类(class)。我正在使用 bootstrap 4 构建网页，我想使用轮播作为标题，但轮播不会缩小到视口(viewport)或屏幕大小，图像比所需的大得多，尤其是在桌面上。

代码源https://github.com/djneill/mbbjj?files=1

演示页面 http://dninstalls.com/blankbootstrap/

    /*Carousel CSS */

    .carouselHeader{background: #655e5d}

    .carousel {
        background-color: red;
        margin: auto;
    }

    .carousel,.item,.active {
        margin: auto;
        height: 100%;
    }

    .carousel-item {
        margin: auto;
        background: no-repeat center center scroll;
        background-size: cover;
        -webkit-background-size: cover;
        -moz-background-size: cover;
        -o-background-size: cover;
    }

    .carousel-inner {
        margin: auto;
        height: 100%;
        background: no-repeat center center scroll;
        -webkit-background-size: cover;
        -moz-background-size: cover;
        -o-background-size: cover;
        background-size: cover;
    }
    <!--    Carousel Header -->
    <header id="carouselHeader" class="page-header">
        <div id="carouselExampleIndicators" class="carousel slide mastheads" data-ride="carousel">
            <ol class="carousel-indicators">
                <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
                <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
                <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
                <li data-target="#carouselExampleIndicators" data-slide-to="3"></li>
            </ol>
            <div class="carousel-inner">
                <!--                    Carousel image 1 -->
                <div class="carousel-item active">
                    <img class="d-block w-100" src="assets/mbbj%20kids.png" alt="First slide">
                </div>
                <!--                    Carousel image 2 -->
                <div class="carousel-item">
                    <img class="d-block w-100" src="assets/mbjj%20kids2.png" alt="Second slide">
                </div>
                <!--                    Carousel image 3 -->
                <div class="carousel-item">
                    <img class="d-block w-100" src="assets/mbjj%20adult.png" alt="Third slide">
                </div>
                <!--                    Carousel image 4 -->
                <div class="carousel-item">
                    <img class="d-block w-100" src="assets/mbjj%20comp.png" alt="Third slide">
                </div>
            </div>
            <a class="carousel-control-prev" href="#carouselExampleIndicators" 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="#carouselExampleIndicators" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
        </div>
    </header>

Answer 1

您可以调整 carousel wrapper 高度以降低其高度。这是最简单快捷的方法。您可以按以下方式进行:

.carousel{
    max-height: calc(100vh - 81px);
    overflow: hidden;
}

这里，81px 是页眉的高度。所以您可以相应地进行调整。