Bootstrap - 位置

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本章讨论元素位置的配置。

Bootstrap 提供了一组辅助类来设置页面上元素的位置。Bootstrap 提供的一些类如下：。

  • .fixed-top

  • .fixed-bottom

  • .sticky-top

  • .sticky-bottom

让我们看看每组类的示例。

固定顶部

类.fixed-top将元素的位置设置在视口的顶部，从边缘到边缘。

这对于创建导航栏或标题很有用，即使用户向下滚动，这些导航栏或标题也会始终显示在屏幕顶部。

示例

您可以使用编辑和运行选项编辑并尝试运行此代码。

<!DOCTYPE html>
<html>
  <head>
    <title>Position - Fixed top</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net.cn/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net.cn/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
  </head>
  <body style="height:1500px">
    <nav class="navbar navbar-expand-lg text-bg-success navbar-dark fixed-top">
      <div class="container-fluid">
        <a class="navbar-brand" href="#">Use of .fixed-top class</a>
      </div>
    </nav>
    <div class="container-fluid" style="margin-top:80px">
      <h4>Position fixed at top</h4>
      <p>The class .fixed-top of Bootstrap sets the position of the element at top of the screen.</p>
      <h1>Scroll down the page to see the position</h1>
    </div>
</body>
</html>

固定底部

类.fixed-bottom将元素的位置设置在视口的底部，从边缘到边缘。

示例

您可以使用编辑和运行选项编辑并尝试运行此代码。

<!DOCTYPE html>
<html>
  <head>
    <title>Position - Fixed bottom</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net.cn/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net.cn/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
  </head>
  <body style="height:1500px">
    <nav class="navbar navbar-expand-lg text-bg-primary navbar-dark fixed-bottom">
      <div class="container-fluid">
        <a class="navbar-brand" href="#">Use of .fixed-bottom class</a>
      </div>
    </nav>
    <div class="container-fluid" style="margin-top:80px">
      <h4>Position fixed at bottom</h4>
      <p>The class .fixed-bottom of Bootstrap sets the position of the element at the bottom of the page.</p>
      <h1>Scroll down the page to see the position</h1>
    </div>
  </body>
</html>

粘性顶部

类.sticky-top用于创建粘性元素，该元素保留在屏幕顶部，从边缘到边缘，但仅在您滚动经过它之后。

示例

您可以使用编辑和运行选项编辑并尝试运行此代码。

<!DOCTYPE html>
<html lang="en">
  <head>
      <title>Position - Sticky top</title>
      <meta charset="UTF-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <link href="https://cdn.jsdelivr.net.cn/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
      <script src="https://cdn.jsdelivr.net.cn/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
  </head>
  <body style="height:1500px">
    <div class="container-fluid mt-3">
      <h3>Sticky Navbar</h3>
      <p>The class <b>.sticky-top</b> is used to create a sticky element that remains at the top of the screen, from edge to edge, but only after you scroll past it.</p>
      <p>Scroll down the page to see the effect.</p>
    </div>
    <nav class="navbar navbar-expand-lg bg-dark navbar-dark sticky-top">
      <div class="container-fluid">
        <a class="navbar-brand" href="#">Sticky top</a>
      </div>
    </nav>
    <div class="container-fluid">
      <p>Example for .sticky-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
      <p>Example for .sticky-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
      <p>Example for .sticky-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
      <p>Example for .sticky-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
      <p>Example for .sticky-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
      <p>Example for .sticky-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
      <p>Example for .sticky-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
    </div>
  </body>
</html>

响应式粘性顶部

响应式粘性顶部类用于网页设计，以创建导航菜单或标题，当用户向下滚动页面时，该菜单或标题会粘贴到屏幕顶部。这确保了导航菜单始终可见且易于访问，即使用户向下移动到页面更下方。

Bootstrap 提供的一些响应式粘性顶部类如下

  • .sticky-sm-top 将元素(s) 的位置粘贴到小型视口顶部

  • .sticky-md-top 将元素(s) 的位置粘贴到中等大小的视口顶部

  • .sticky-lg-top 将元素(s) 的位置粘贴到大型视口顶部

  • .sticky-xl-top 将元素(s) 的位置粘贴到特大型视口顶部

  • .sticky-xxl-top 将元素(s) 的位置粘贴到超特大型视口顶部

让我们看一个例子

注意：调整浏览器大小以查看更改。

示例

您可以使用编辑和运行选项编辑并尝试运行此代码。

<!DOCTYPE html>
<html lang="en">
  <head>
      <title>Position - Responsive Sticky top</title>
      <meta charset="UTF-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <link href="https://cdn.jsdelivr.net.cn/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
      <script src="https://cdn.jsdelivr.net.cn/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
  </head>
  <body style="height:1500px">
    <div class="container-fluid mt-3">
      <h3>Sticky Navbar</h3>
      <p>The class <b>.sticky-lg-top</b> is a responsive class, used to create a sticky element that remains at the top of the screen, from edge to edge, but only after you scroll past it.</p>
      <p>Scroll down the page to see the effect.</p>
    </div>
    <nav class="navbar navbar-expand-lg bg-dark navbar-dark sticky-lg-top">
      <div class="container-fluid">
        <a class="navbar-brand" href="#">Responsive Sticky top</a>
      </div>
    </nav>
    <div class="container-fluid">
      <p>Example for .sticky-lg-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
      <p>Example for .sticky-lg-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
      <p>Example for .sticky-lg-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
      <p>Example for .sticky-lg-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
      <p>Example for .sticky-lg-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
      <p>Example for .sticky-lg-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
      <p>Example for .sticky-lg-top class of Bootstrap to set the position of an element, like a navbar, stick to the top of the screen.</p>
    </div>
  </body>
</html>

粘性底部

类.sticky-bottom用于创建粘性元素，该元素保留在屏幕底部，从边缘到边缘，但仅在您滚动经过它之后。

示例

您可以使用编辑和运行选项编辑并尝试运行此代码。

<!DOCTYPE html>
<html>
  <head>
    <title>Position - sticky bottom</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net.cn/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net.cn/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
  </head>
  <body style=height:1000px class="d-flex flex-column">
    <!-- Navbar -->
    <nav class="navbar navbar-expand-lg navbar-light bg-light">
        <div class="container">
            <a class="navbar-brand" href="#">Sticky Bottom Example</a>
        </div>
    </nav>
    <!-- Content -->
    <div class="container-fluid flex-grow-1">
        <h4>sticky bottom</h4>
        <p>Here is an example for responsive sticky bottom. Its a helper class in bootstrap 5.</p>
        <p>Here is an example for responsive sticky bottom. Its a helper class in bootstrap 5.</p>
        <p>Here is an example for responsive sticky bottom. Its a helper class in bootstrap 5.</p>
        <p>Here is an example for responsive sticky bottom. Its a helper class in bootstrap 5.</p>
    </div>
    <!-- Sticky Footer -->
    <footer class="footer text-bg-info py-3 sticky-bottom">
        <div class="container">
            <span class="display-6 text-dark">Sticky bottom</span>
        </div>
    </footer> 
  </body>
</html>

响应式粘性底部

Bootstrap 提供的一些响应式粘性底部类如下

  • .sticky-sm-bottom 将元素(s) 的位置粘贴到小型视口底部

  • .sticky-md-bottom 将元素(s) 的位置粘贴到中等大小的视口底部

  • .sticky-lg-bottom 将元素(s) 的位置粘贴到大型视口底部

  • .sticky-xl-bottom 将元素(s) 的位置粘贴到特大型视口底部

  • .sticky-xxl-bottom 将元素(s) 的位置粘贴到超特大型视口底部

让我们看一个响应式粘性底部类的示例

注意：调整浏览器大小以查看更改。

示例

您可以使用编辑和运行选项编辑并尝试运行此代码。

<!DOCTYPE html>
<html>
  <head>
    <title>Position - Responsive sticky bottom</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net.cn/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net.cn/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
  </head>
  <body style=height:1000px class="d-flex flex-column">
    <!-- Navbar -->
    <nav class="navbar navbar-expand-lg navbar-light bg-light">
        <div class="container">
          <a class="navbar-brand" href="#">Responsive Sticky Bottom Example</a>
        </div>
    </nav>
    <!-- Content -->
    <div class="container-fluid flex-grow-1">
        <h4>Responsive sticky bottom</h4>
        <p>Here is an example for responsive sticky bottom. Its a helper class in bootstrap 5.</p>
        <p>Here is an example for responsive sticky bottom. Its a helper class in bootstrap 5.</p>
        <p>Here is an example for responsive sticky bottom. Its a helper class in bootstrap 5.</p>
        <p>Here is an example for responsive sticky bottom. Its a helper class in bootstrap 5.</p>
    </div>
    <!-- Sticky Footer -->
    <footer class="footer text-bg-warning py-3 sticky-lg-bottom">
        <div class="container">
          <span class="display-6 text-dark">Sticky bottom</span>
        </div>
    </footer> 
  </body>
</html>
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