运行截图如下;

 

代码如下:
- <!DOCTYPE html>
- <html lang="en">
- <head>
-     <meta charset="UTF-8">
-     <title>CN_TEST1</title>
-     <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
-  
- <!--    bootstrap css核心文件-->
-     <link rel="stylesheet" href="bootstrap-4.4.1-dist/css/bootstrap.min.css">
- <!--    bootstrap使用到了jquery,需要提前引用-->
-     <script src="js/jquery-3.5.1.min.js"></script>
- <!--    弹窗、提示、下拉菜单-->
-     <script src="bootstrap-4.4.1-dist/js/bootstrap.bundle.js"></script>
- <!--    bootstrap核心文件-->
-     <script src="bootstrap-4.4.1-dist/js/bootstrap.min.js"></script>
-  
- </head>
- <body>
-  
-     <div class="container-fluid">
-  
-         <div class="card">
-             <div class="card-body">Card</div>
-         </div>
-  
-         <br/>
-  
-         <div class="card">
-             <div class="card-header">Header</div>
-             <div class="card-body">Body</div>
-             <div class="card-footer">Footer</div>
-         </div>
-  
-         <br/>
-  
-         <h2>多颜色Card</h2>
-         <div class="card">
-             <div class="card-body">Basic card</div>
-         </div>
-         <br/>
-         <div class="card">
-             <div class="card-body bg-primary text-white">Primary card</div>
-         </div>
-         <br/>
-         <div class="card">
-             <div class="card-body bg-success text-white">Success card</div>
-         </div>
-         <br/>
-         <div class="card">
-             <div class="card-body bg-info">Info card</div>
-         </div>
-         <br/>
-         <div class="card">
-             <div class="card-body bg-warning text-white">Warning card</div>
-         </div>
-         <br/>
-         <div class="card">
-             <div class="card-body bg-danger text-white">Danger card</div>
-         </div>
-         <br/>
-         <div class="card">
-             <div class="card-body bg badge-secondary text-white">Secondary card</div>
-         </div>
-         <br/>
-         <div class="card">
-             <div class="card-body bg-dark text-light">Dark card</div>
-         </div>
-         <br/>
-  
- <!--        标题、文本、链接-->
-         <div class="card">
-             <div class="card-body">
-                 <h4 class="card-title">Card Title</h4>
-                 <p class="card-text">Hello World</p>
-                 <a href="#" class="card-link">link one</a>
-                 <a href="#" class="card-link">link two</a>
-             </div>
-         </div>
-  
-         <br/>
-  
- <!--        图片-->
-         <div class="card" style="width: 500px">
-             <img class="card-img-top" src="pic/it1995.jpg"/>
-             <div class="card-body">
-                 <h4 class="card-title">Card Title</h4>
-                 <p class="card-text">Hello World</p>
-                 <a href="#" class="card-link">link one</a>
-                 <a href="#" class="card-link">link two</a>
-             </div>
-         </div>
-  
-         <br/>
-  
- <!--        图片设置为背景-->
-         <div class="card" style="width: 500px">
-             <img class="card-img-top" src="pic/it1995.jpg"/>
-             <div class="card-img-overlay">
-                 <h4 class="card-title">Card Title</h4>
-                 <p class="card-text">Hello World</p>
-                 <a href="#" class="card-link">link one</a>
-                 <a href="#" class="card-link">link two</a>
-             </div>
-         </div>
-  
-     </div>
-  
- </body>
- </html>
解释:
①在div中先添加card类,在到内部的div中设置card-body,就能创建卡片了;
②卡片通常分为三个部分分别是:card-header、card-body、card-footer;
③图片卡片里面,在img中添加card-img-top和card-img-bottom设置图片在文字的什么地方。

 
                

















