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Bootstrap 辅助类

2015-09-25 17:03:07 更新

Bootstrap 辅助类

本章将讨论 Bootstrap 中的一些可能会派上用场的辅助类。

文本

以下不同的类展示了不同的文本颜色。如果文本是个链接鼠标移动到文本上会变暗:

描述 实例
.text-muted "text-muted" 类的文本样式 尝试一下
.text-primary "text-primary" 类的文本样式 尝试一下
.text-success "text-success" 类的文本样式 尝试一下
.text-info "text-info" 类的文本样式 尝试一下
.text-warning "text-warning" 类的文本样式 尝试一下
.text-danger "text-danger" 类的文本样式 尝试一下

背景

以下不同的类展示了不同的背景颜色。 如果文本是个链接鼠标移动到文本上会变暗:

描述 实例
.bg-primary 表格单元格使用了 "bg-primary" 类 尝试一下
.bg-success 表格单元格使用了 "bg-success" 类 尝试一下
.bg-info 表格单元格使用了 "bg-info" 类 尝试一下
.bg-warning 表格单元格使用了 "bg-warning" 类 尝试一下
.bg-danger 表格单元格使用了 "bg-danger" 类 尝试一下

其他

描述 实例
.pull-left 元素浮动到左边 尝试一下
.pull-right 元素浮动到右边 尝试一下
.center-block 设置元素为 display:block 并居中显示 尝试一下
.clearfix 清除浮动 尝试一下
.show 强制元素显示 尝试一下
.hidden 强制元素隐藏 尝试一下
.sr-only 除了屏幕阅读器外,其他设备上隐藏元素 尝试一下
.sr-only-focusable 与 .sr-only 类结合使用,在元素获取焦点时显示(如:键盘操作的用户) 尝试一下
.text-hide 将页面元素所包含的文本内容替换为背景图 尝试一下
.close 显示关闭按钮 尝试一下
.caret 显示下拉式功能 尝试一下

更多实例

关闭图标

使用通用的关闭图标来关闭模态框和警告框。使用 class close 得到关闭图标。

<!DOCTYPE html><html><head>
   <title>Bootstrap 实例 - 关闭图标</title>
   <link rel="stylesheet" href="//apps.bdimg.com/libs/bootstrap/3.3.0/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="external nofollow" target="_blank" >
   <script src="//apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="//apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script></head><body><p>关闭图标实例   <button type="button" class="close" aria-hidden="true">
      &times;   </button></p></body></html>

结果如下所示:

关闭图标

插入符

使用插入符表示下拉功能和方向。使用带有 class caret 的 <span> 元素得到该功能。

<!DOCTYPE html><html><head>
   <title>Bootstrap 实例 - 插入符</title>
   <link rel="stylesheet" href="//apps.bdimg.com/libs/bootstrap/3.3.0/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="external nofollow" target="_blank" >
   <script src="//apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="//apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script></head><body><p>插入符实例   <span class="caret"></span></p></body></html>

结果如下所示:

插入符

快速浮动

您可以分别使用 class pull-leftpull-right 来把元素向左或向右浮动。下面的实例演示了这点。

<!DOCTYPE html><html><head>
   <title>Bootstrap 实例 - 快速浮动</title>
   <link rel="stylesheet" href="//apps.bdimg.com/libs/bootstrap/3.3.0/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="external nofollow" target="_blank" >
   <script src="//apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="//apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script></head><body><div class="pull-left">
   向左快速浮动</div><div class="pull-right">
   向右快速浮动</div></body></html>

结果如下所示:

快速浮动

如需对齐导航栏中的组件,请使用 .navbar-left.navbar-right 代替。请查看 Bootstrap 导航栏

内容居中

使用 class center-block 来居中元素。

<!DOCTYPE html><html><head>
   <title>Bootstrap 实例 - 居中内容块</title>
   <link rel="stylesheet" href="//apps.bdimg.com/libs/bootstrap/3.3.0/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="external nofollow" target="_blank" >
   <script src="//apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="//apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script></head><body><div class="row">
   <div class="center-block" style="width:200px;background-color:#ccc;">
      这是 center-block 实例   </div></div></body></html>

结果如下所示:

居中内容块

清除浮动

如需清除元素的浮动,请使用 .clearfix class。

<!DOCTYPE html><html><head>
   <title>Bootstrap 实例 - 清除浮动</title>
   <link rel="stylesheet" href="//apps.bdimg.com/libs/bootstrap/3.3.0/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="external nofollow" target="_blank" >
   <script src="//apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="//apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script></head><body><div class="clearfix"  style="background: #D8D8D8;border: 1px solid #000;padding: 10px;">
   <div class="pull-left" style="background:#58D3F7;">
      向左快速浮动   </div>
   <div class="pull-right" style="background: #DA81F5;">
      向右快速浮动   </div></div></body></html>

结果如下所示:

清除浮动

显示和隐藏内容

您可以通过使用 class .show.hidden 来强行设置元素显示或隐藏(包括屏幕阅读器)。

<!DOCTYPE html><html><head>
   <title>Bootstrap 实例 - 显示和隐藏内容</title>
   <link rel="stylesheet" href="//apps.bdimg.com/libs/bootstrap/3.3.0/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="external nofollow" target="_blank" >
   <script src="//apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="//apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script></head><body><div class="row" style="padding: 91px 100px 19px 50px;">
   <div class="show" style="left-margin:10px;width:300px;background-color:#ccc;">
      这是 show class 的实例   </div>
   <div class="hidden" style="width:200px;background-color:#ccc;">
      这是 hide class 的实例   </div></div></body></html>

结果如下所示:

显示和隐藏内容

屏幕阅读器

您可以通过使用 class .sr-only 来把元素对所有设备隐藏,除了屏幕阅读器。

<!DOCTYPE html><html><head>
   <title>Bootstrap 实例 - 屏幕阅读器</title>
   <link rel="stylesheet" href="//apps.bdimg.com/libs/bootstrap/3.3.0/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="external nofollow" target="_blank" >
   <script src="//apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="//apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script></head><body><div class="row" style="padding: 91px 100px 19px 50px;">
   <form class="form-inline" role="form">
   <div class="form-group">
      <label class="sr-only" for="email">Email 地址</label>
      <input type="email" class="form-control" placeholder="Enter email">
   </div>
   <div class="form-group">
      <label class="sr-only" for="pass">密码</label>
      <input type="password" class="form-control" placeholder="Password">
   </div>
   </form></div></body></html>

结果如下所示:

屏幕阅读器

在这里,我们看到两个 input 类型的 label 标签都带有 class sr-only,因此标签将只对屏幕阅读器可见。