Bootstrap5 图像形状

2023-06-21 14:59 更新

圆角图片

.rounded 类可以让图片显示圆角效果：

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
  <h2>圆角图片</h2>
  <p>.rounded 类可以让图片显示圆角效果：</p>            
  <img src="https://atts.w3cschool.cn/attachments/image/20230621/1687330063543768.jpeg" class="rounded" alt="Cinque Terre" width="304" height="236"> 
</div>

</body>
</html>

椭圆图片

.rounded-circle 类可以设置椭圆形图片:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
  <h2>椭圆图片</h2>
  <p>.rounded-circle 类可以设置椭圆形图片:</p>            
  <img src="https://atts.w3cschool.cn/attachments/image/20230621/1687330063543768.jpeg" class="rounded-circle" alt="Cinque Terre"> 
</div>

</body>
</html>

缩略图

.img-thumbnail 类用于设置图片缩略图(图片有边框):

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>
<div class="container mt-3">
  <h2>缩略图</h2>
  <p>.img-thumbnail 类用于设置图片缩略图(图片有边框):</p>             
  <img src="https://atts.w3cschool.cn/attachments/image/20230621/1687330063543768.jpeg" class="img-thumbnail" alt="Cinque Terre" width="304" height="236"> 
</div>
</body>
</html>

图片对齐方式

使用 .float-start 类来设置图片左对齐，使用 .float-end 类设置图片右对齐:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
  <h2>图片对齐方式</h2>
  <p>使用 .float-start 类来设置图片左对齐，使用 .float-end 类设置图片右对齐:</p>
  <img src="https://atts.w3cschool.cn/attachments/image/20230621/1687330063543768.jpeg" class="float-start" alt="Paris" width="304" height="236"> 
  <img src="https://atts.w3cschool.cn/attachments/image/20230621/1687330063543768.jpeg" class="float-end" alt="Paris" width="304" height="236"> 
</div>

</body>
</html>

图片居中

使用 .mx-auto (margin:auto) 和 .d-block (display:block) 类来设置图片居中对齐：

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
  <h2>图片居中</h2>
  <p>使用 .mx-auto (margin:auto) 和 .d-block (display:block) 类来设置图片居中对齐：</p> 
  <img src="https://atts.w3cschool.cn/attachments/image/20230621/1687330063543768.jpeg" class="mx-auto d-block" style="width:50%"> 
</div>

</body>
</html>

响应式图片

图像有各种各样的尺寸，我们需要根据屏幕的大小自动适应。

我们可以通过在 <img> 标签中添加 .img-fluid 类来设置响应式图片。

.img-fluid 类设置了 max-width: 100%; 、 height: auto; :

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
  <h2>响应式图片</h2>
  <p>.img-fluid 类可以设置响应式图片，重置浏览器大小查看效果:</p>
  <img src="https://atts.w3cschool.cn/attachments/image/20230621/1687330063543768.jpeg" class="img-fluid">
</div>

</body>
</html>

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