我不确定您的代码有什么问题，但是当我自定义代码时，它将起作用。请查看我的代码，并让我知道进一步的澄清。

希望这会有所帮助

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">

<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>




<div id="carousel-indicators" class="carousel slide" data-ride="carousel">
  <!-- Indicators -->
  <ol class="carousel-indicators">
    <li data-target="#carousel-indicators" data-slide-to="0" class="active"></li>
    <li data-target="#carousel-indicators" data-slide-to="1"></li>
    <li data-target="#carousel-indicators" data-slide-to="2"></li>
  </ol>

  <!-- Wrapper for slides -->
    <div class="container">
        <div class="carousel-inner">
    <div class="item active">
      <img src="https://images.pexels.com/photos/459225/pexels-photo-459225.jpeg?auto=compress&cs=tinysrgb&h=750&w=1260" class="d-block w-100" alt="First">
    </div>

    <div class="item">
      <img src="https://images.pexels.com/photos/2283759/pexels-photo-2283759.jpeg?auto=compress&cs=tinysrgb&h=750&w=1260" class="d-block w-100" alt="Second">
    </div>

    <div class="item">
      <img src="https://images.pexels.com/photos/2283759/pexels-photo-2283759.jpeg?auto=compress&cs=tinysrgb&h=750&w=1260" class="d-block w-100" alt="Third">
            </div>
    </div>
  </div>
</div>

    <!--Next and Previous buttons-->
    <a class="carousel-control-prev" href="#randomCarousel" 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="#randomCarousel" role="button" data-slide="next">
        <span class="carousel-control-next-icon" aria-hidden="true"></span>
        <span class="sr-only">Next</span>
    </a>
</div>

您的代码运行正常，可能是您忘记了包含引导程序库文件（CSS和JS），或者可能是忘记了包含js库文件。不确定确切缺少什么。

这是您的代码的有效示例。

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<div id="randomCarousel" class="carousel slide" data-ride="carousel">

    <!--Indicator Buttons-->
    <ol class="carousel-indicators">
        <li data-target="#randomCarousel" data-slide-to="0" class="active"></li>
        <li data-target="#randomCarousel" data-slide-to="1"></li>
        <li data-target="#randomCarousel" data-slide-to="2"></li>
    </ol>

    <!--Carousel w/Images-->
    <div class="container">
        <div class="carousel-inner">

            <!--ALL PICS ARE PART OF CREATIVE COMMONS; ADDED SIMPLY FOR FUN-->
            <div class="carousel-item active">
                <img src="https://images.pexels.com/photos/459225/pexels-photo-459225.jpeg?auto=compress&cs=tinysrgb&h=750&w=1260" class="d-block w-100" alt="First">
            </div>

            <div class="carousel-item">
                <img src="https://images.pexels.com/photos/2283759/pexels-photo-2283759.jpeg?auto=compress&cs=tinysrgb&h=750&w=1260" class="d-block w-100" alt="Second">
            </div>

            <div class="carousel-item">
                <img src="https://images.pexels.com/photos/2283759/pexels-photo-2283759.jpeg?auto=compress&cs=tinysrgb&h=750&w=1260" class="d-block w-100" alt="Third">
            </div>

        </div>
    </div>

    <!--Next and Previous buttons-->
    <a class="carousel-control-prev" href="#randomCarousel" 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="#randomCarousel" role="button" data-slide="next">
        <span class="carousel-control-next-icon" aria-hidden="true"></span>
        <span class="sr-only">Next</span>
    </a>

</div>

https://codepen.io/pgurav/pen/KKKxBwM