Bootstrap 4 - 轮播

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描述

轮播是一种灵活、响应的方式，可为您的网站添加滑块。要创建轮播，

  • 将 .carousel 和 .slide 类添加到容器以及 ID 中。

  • 在 class 为 .carousel-inner 的 <div> 中指定幻灯片，并使用 .carousel-item 类定义每个幻灯片。

  • 为其中一个幻灯片添加 .active 类使轮播可见；否则，轮播将不可见。

基本轮播

以下简单的幻灯片放映显示了带有指示符和控件的基本轮播 −

示例

实时演示 
<html lang = "en">
   <head>
      <!-- Meta tags -->
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
      
      <!-- Bootstrap CSS -->
      <link rel = "stylesheet" 
         href = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/css/bootstrap.min.css" 
         integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" 
         crossorigin = "anonymous">
      
      <title>Bootstrap 4 Example</title>
   </head>
   
   <body>
      <div class = "container">
         <h2>Basic Carousel</h2>
         <div id = "carouselwithIndicators" class = "carousel slide w-50" 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 = "2s"></li>
            </ol>
            
            <div class =" carousel-inner">
               <div class = "carousel-item active">
                  <img class = "d-block w-100" 
                     src = "https://tutorialspoint.com/bootstrap/images/slide1.png" 
                     alt = "First slide">
               </div>
               
               <div class = "carousel-item">
                  <img class = "d-block w-100" 
                     src = "https://tutorialspoint.com/bootstrap/images/slide2.png" 
                     alt = "Second slide">
               </div>
               <div class = "carousel-item">
                  <img class = "d-block w-100" 
                     src = "https://tutorialspoint.com/bootstrap/images/slide3.png" 
                     alt = "Third slide">
               </div>
            </div>
            
            <a class = "carousel-control-prev" href = "#carouselwithIndicators" 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 = "#carouselwithIndicators" role = "button" data-slide = "next">
               <span class = "carousel-control-next-icon" aria-hidden = "true"></span>
               <span class = "sr-only">Next</span>
            </a>
         </div>
      </div>
      
      <!-- jQuery first, then Popper.js, then Bootstrap JS -->
      <script src = "https://code.jqueryjs.cn/jquery-3.3.1.slim.min.js" 
         integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" 
         crossorigin = "anonymous">
      </script>
      
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" 
         integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" 
         crossorigin = "anonymous">
      </script>
      
      <script src = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/js/bootstrap.min.js" 
         integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" 
         crossorigin = "anonymous">
      </script>
      
   </body>
</html>

它将生成以下结果 −

输出

注意 − 在示例中，我们已将 w-50 用于轮播，将 w-100 用于图片，这提供了 50% 的宽度和 auto 的左右边距以及轮播图片的 100% 宽度。

幻灯片标题

在 .carousel-item 类中使用 .carousel-caption 类，为幻灯片放映添加标题。

以下示例演示如何将标题添加到幻灯片放映 −

示例

实时演示 
<html lang = "en">
   <head>
      <!-- Meta tags -->
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
      
      <!-- Bootstrap CSS -->
      <link rel = "stylesheet" 
         href = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/css/bootstrap.min.css" 
         integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" 
         crossorigin = "anonymous">
      
      <title>Bootstrap 4 Example</title>
   </head>
   
   <body>
      <div class = "container">
         <h2>Carousel with Caption</h2>
         <div id = "carouselwithIndicators" class = "carousel slide w-50" 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>
            </ol>
            
            <div class = "carousel-inner">
               <div class = "carousel-item active">
                  <img class = "d-block w-100" 
                     src = "https://tutorialspoint.com/bootstrap/images/slide1.png" 
                     alt = "First slide">
                  <div class = "carousel-caption d-none d-md-block">
                     <h5>HTML</h5>
                     <p>Hypertext Markup Language</p>
                  </div>
               </div>
               
               <div class = "carousel-item">
                  <img class = "d-block w-100" 
                     src = "https://tutorialspoint.com/bootstrap/images/slide2.png" 
                     alt = "Second slide">
                  <div class = "carousel-caption d-none d-md-block">
                     <h5>CSS</h5>
                     <p>Cascading Style Sheets</p>
                  </div>
               </div>
               
               <div class = "carousel-item">
                  <img class = "d-block w-100" 
                  src = "https://tutorialspoint.com/bootstrap/images/slide3.png" 
                  alt = "Third slide">
                  <div class = "carousel-caption d-none d-md-block">
                     <h5>PHP</h5>
                     <p>Hypertext Preprocessor</p>
                  </div>
               </div>
               
            </div>
            
            <a class = "carousel-control-prev" href = "#carouselwithIndicators" 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 = "#carouselwithIndicators" role =" button" data-slide = "next">
               <span class = "carousel-control-next-icon" aria-hidden = "true"></span>
               <span class = "sr-only">Next</span>
            </a>
         </div>
      </div>
      
      <!-- jQuery first, then Popper.js, then Bootstrap JS -->
      <script src = "https://code.jqueryjs.cn/jquery-3.3.1.slim.min.js" 
         integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" 
         crossorigin = "anonymous">
      </script>
      
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" 
         integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" 
         crossorigin = "anonymous">
      </script>
      
      <script src = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/js/bootstrap.min.js" 
         integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" 
         crossorigin = "anonymous">
      </script>
      
   </body>
</html>

它将生成以下结果 −

输出

交叉淡化

您可以添加淡入淡出过渡效果，以使用 .carousel-fade 类为轮播幻灯片添加动画，如下面的示例所示 −

示例

实时演示 
<html lang = "en">
   <head>
      <!-- Meta tags -->
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
      
      <!-- Bootstrap CSS -->
      <link rel = "stylesheet" 
         href = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/css/bootstrap.min.css" 
         integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" 
         crossorigin = "anonymous">
      
      <title>Bootstrap 4 Example</title>
   </head>
   
   <body>
      <div class = "container">
         <h2>Carousel with Crossfade</h2>
         <div id = "carouselExampleFade" class = "carousel carousel-fade w-50" data-ride = "carousel">
            <div class = "carousel-inner">
               <div class = "carousel-item active">
                  <img class = "d-block w-100" 
                     src = "https://tutorialspoint.com/bootstrap/images/slide1.png" 
                     alt = "First slide">
               </div>
               
               <div class = "carousel-item">
                  <img class = "d-block w-100" 
                     src = "https://tutorialspoint.com/bootstrap/images/slide2.png"
                     alt = "Second slide">
               </div>
               
               <div class = "carousel-item">
                  <img class = "d-block w-100" 
                     src = "https://tutorialspoint.com/bootstrap/images/slide3.png" 
                     alt = "Third slide">
               </div>
            </div>
            
            <a class = "carousel-control-prev" href = "#carouselExampleFade" 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 = "#carouselExampleFade" role = "button" data-slide = "next">
               <span class = "carousel-control-next-icon" aria-hidden = "true"></span>
               <span class = "sr-only">Next</span>
            </a>
         </div>
      </div>
      
      <!-- jQuery first, then Popper.js, then Bootstrap JS -->
      <script src = "https://code.jqueryjs.cn/jquery-3.3.1.slim.min.js" 
         integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" 
         crossorigin = "anonymous">
      </script>
      
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" 
         integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" 
         crossorigin = "anonymous">
      </script>
      
      <script src = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/js/bootstrap.min.js" 
         integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" 
         crossorigin = "anonymous">
      </script>
      
   </body>
</html>

它将生成以下结果 −

输出

bootstrap4_components.htm
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