Bootstrap 5:图像


目录

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图像形状

Rounded Corners:

Paris

Circle:

NYC

Thumbnail:

San Fran

圆角

.rounded 类为图像添加圆角:

例子

<img src="cinqueterre.jpg" class="rounded" alt="Cinque Terre">

自己尝试一下→

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>

<div class="container mt-3">
  <h2>Rounded Corners</h2>
  <p>The .rounded class adds rounded corners to an image:</p>            
  <img src="cinqueterre.jpg" class="rounded" alt="Cinque Terre" width="304" height="236"> 
</div>

</body>
</html>

圆圈

.rounded-circle 类将图像塑造为圆形:

例子

<img src="cinqueterre.jpg" class="rounded-circle" alt="Cinque Terre">

自己尝试一下→

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>

<div class="container mt-3">
  <h2>Circle</h2>
  <p>The .rounded-circle class shapes the image to a circle:</p>            
  <img src="cinqueterre.jpg" class="rounded-circle" alt="Cinque Terre" width="304" height="236"> 
</div>

</body>
</html>

缩略图

.img-thumbnail 类将图像塑造为缩略图 (有边框):

例子

<img src="cinqueterre.jpg" class="img-thumbnail" alt="Cinque Terre">

自己尝试一下→

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>

<div class="container mt-3">
  <h2>Thumbnail</h2>
  <p>The .img-thumbnail class creates a thumbnail of the image:</p>            
  <img src="cinqueterre.jpg" class="img-thumbnail" alt="Cinque Terre" width="304" height="236"> 
</div>

</body>
</html>

对齐图像

使用 .float-start 类将图像浮动到左侧,或者使用 .float-end 类将图像浮动到右侧:

例子

 <img src="paris.jpg" class="float-start"> 
<img src="paris.jpg" class="float-end"> 

自己尝试一下→

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>

<div class="container mt-3">
  <h2>Aligning images</h2>
  <p>Use the float classes to float the image to the left or to the right:</p> 
  <img src="paris.jpg" class="float-start" alt="Paris" width="304" height="236"> 
  <img src="paris.jpg" class="float-end" alt="Paris" width="304" height="236"> 
</div>

</body>
</html>

居中图像

通过添加实用程序类 .mx-auto (margin:auto) 和 .d-block 将图像居中(显示:块)到图像:

例子

 <img src="paris.jpg" class="mx-auto d-block">

自己尝试一下→

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>

<div class="container mt-3">
  <h2>Centered Image</h2>
  <p>Center an image by adding the utility classes .mx-auto (margin:auto) and .d-block (display:block) to the image:</p> 
  <img src="paris.jpg" class="mx-auto d-block" style="width:50%"> 
</div>

</body>
</html>

响应式图像

图像有各种尺寸。屏幕也是如此。自动响应图像 调整以适合屏幕尺寸。

通过添加 .img-fluid 类来创建响应式图像 到 <img> 标签。然后图像将很好地缩放到父元素。

.img-fluid 类应用 max-width: 100%; 并且 height: auto; 到图像:

例子

<img class="img-fluid" src="ny.jpg" alt="New York"> 

自己尝试一下→

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>

<div class="container mt-3">
  <h2>Image</h2>
  <p>The .img-fluid class makes the image scale nicely to the parent element (resize the browser window to see the effect):</p>
  <img class="img-fluid" src="ny.jpg" alt="New York" width="1100" height="500"> 
</div>

</body>
</html>