javascript - CSS 不在 MVC 5 View For image-gallery 中的事件缩略图下方绘制边框

Question

下面的 CSS 应该会导致白色边框出现在图片库中当前事件的缩略图下方，但实际上并没有。

.carousel-thumbnails .carousel-indicators li {
        height: auto;
        max-width: 100px;
        width: 100px;
        border: none;
        box-shadow: 1px 3px 5px 0px rgba(0,0,0,0.75);

        &.active {
            border-bottom: 4px solid #fff;
        }
    }

Visual Studio 17 下划线“&”表示缺少属性。我见过像 P 或 H1 这样设置事件的例子，但我不明白为什么那里有“&”符号。 CSS 来自以下链接，其中包含完整的代码集。

enter link description here

我已将示例库添加到我的 ASP.NET MVC 5 应用程序的 View 中。除了在事件缩略图下方绘制细边框的 CSS 部分外，一切正常。有人可以告诉我如何修复它，或者这是在 Visual Studio 2017 下无法正常工作的东西吗？

下面是我使用示例创建的 MVC View 的副本:

@{
    ViewBag.Title = "Claremont Botanical Garden";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<br />
<link href="~/Content/slideshow/carousel-with-thumbails.css" rel="stylesheet" />
<script src="~/Scripts/slideshow/carousel-with-thumbails.js"></script>

<!--Carousel Wrapper-->
<div id="carousel-thumb" class="carousel slide carousel-fade carousel-thumbnails" data-ride="carousel">
    <!--Slides-->

    <div class="carousel-inner" role="listbox">
        <div class="carousel-item active">
            <img class="d-block w-100"
                 src="~/Content/Images/Photos/Animals/_Squirrel-01-DSC_0028-1440.jpg" alt="First slide">
        </div>
        <div class="carousel-item">
            <img class="d-block w-100"
                 src="~/Content/Images/Photos/Animals/_Squirrel-02-DSC_0131-1440.jpg" alt="Second slide">
        </div>
        <div class="carousel-item">
            <img class="d-block w-100"
                 src="~/Content/Images/Photos/Animals/_Squirrel-03-DSC_0154-1440.jpg" alt="Third slide">
        </div>

        <div class="carousel-item">
            <img class="d-block w-100"
                 src="~/Content/Images/Photos/Animals/_Bird-01-DSC_0639-1440.jpg" alt="Third slide">
        </div>
        <div class="carousel-item">
            <img class="d-block w-100"
                 src="~/Content/Images/Photos/Animals/_bird-02-DSC_0158-1440.jpg" alt="Third slide">
        </div>
        <div class="carousel-item">
            <img class="d-block w-100"
                 src="~/Content/Images/Photos/Animals/_Bird-03-DSC_0606-1440.jpg" alt="Third slide">
        </div>
        <div class="carousel-item">
            <img class="d-block w-100"
                 src="~/Content/Images/Photos/Animals/_Bird-04-DSC_0637-1410.jpg" alt="Third slide">
        </div>
        <div class="carousel-item">
            <img class="d-block w-100"
                 src="~/Content/Images/Photos/Animals/_Bird-hawk-01-DSC_0550-1440.jpg" alt="Third slide">
        </div>




    </div>
    <!--/.Slides-->
    <!--Controls-->
    <a class="carousel-control-prev" href="#carousel-thumb" 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="#carousel-thumb" role="button" data-slide="next">
        <span class="carousel-control-next-icon" aria-hidden="true"></span>
        <span class="sr-only">Next</span>
    </a>
    <!--/.Controls-->

    <ol class="carousel-indicators">
        <li data-target="#carousel-thumb" data-slide-to="0">
            <img class="d-block w-100 img-fluid"
                 src="~/Content/Images/Photos/Animals/_Squirrel-01-DSC_0028-1440.jpg">
        </li>
        <li data-target="#carousel-thumb" data-slide-to="1">
            <img class="d-block w-100 img-fluid"
                 src="~/Content/Images/Photos/Animals/_Squirrel-02-DSC_0131-1440.jpg">
        </li>
        <li data-target="#carousel-thumb" data-slide-to="2">
            <img class="d-block w-100 img-fluid"
                 src="~/Content/Images/Photos/Animals/_Squirrel-03-DSC_0154-1440.jpg">
        </li>

        <li data-target="#carousel-thumb" data-slide-to="3" class="active">
            <img class="d-block w-100 img-fluid"
                 src="~/Content/Images/Photos/Animals/_Bird-01-DSC_0639-1440.jpg">
        </li>
        <li data-target="#carousel-thumb" data-slide-to="4">
            <img class="d-block w-100 img-fluid"
                 src="~/Content/Images/Photos/Animals/_bird-02-DSC_0158-1440.jpg">
        </li>
        <li data-target="#carousel-thumb" data-slide-to="5">
            <img class="d-block w-100 img-fluid"
                 src="~/Content/Images/Photos/Animals/_Bird-03-DSC_0606-1440.jpg">
        </li>
        <li data-target="#carousel-thumb" data-slide-to="6">
            <img class="d-block w-100 img-fluid"
                 src="~/Content/Images/Photos/Animals/_Bird-04-DSC_0637-1410.jpg">
        </li>

        <li data-target="#carousel-thumb" data-slide-to="7">
            <img class="d-block w-100 img-fluid"
                 src="~/Content/Images/Photos/Animals/_Bird-hawk-01-DSC_0550-1440.jpg">
        </li>

    </ol>
</div>
<!--/.Carousel Wrapper-->

提前致谢。

Answer 1

你复制的是SCSS ，不是纯 CSS。如果您没有使用预处理器，您复制的代码将无法运行。

此上下文中的符号 & 表示选择器 .carousel-thumbnails .carousel-indicators li.active The Sass Ampersand .

因此，如果您不使用预处理器，请删除嵌套规则 &.active { border-bottom: 4px solid #fff; } 而是创建一个新的(非嵌套的)规则 .carousel-thumbnails .carousel-indicators li.active { border-bottom: 4px solid #fff; } 并且它应该可以工作(我假设您在元素处于事件状态时还有其他应用 .active 类的东西)。