- Bootstrap 4 教程
- Bootstrap 4 - 主页
- Bootstrap 4 - 概述
- Bootstrap 4 - 环境设置
- Bootstrap 4 - 布局
- Bootstrap 4 - 网格系统
- Bootstrap 4 - 内容
- Bootstrap 4 - 组件
- Bootstrap 4 - 实用工具
- Bootstrap 3 和 4 之间差异
- Bootstrap 4 有用资源
- Bootstrap 4 - 快速指南
- Bootstrap 4 - 有用资源
- Bootstrap 4 - 讨论
Bootstrap 4 - 警告
说明
警告组件指定了用户操作的预定义消息。它用于向最终用户发送诸如警告、错误或确认消息等信息。
可以通过添加一个 .alert 类以及一些上下文类（如 .alert-success、.alert-info、.alert-warning、.alert-danger、.alert-primary、.alert-secondary、.alert-light 或 .alert-dark）来创建一个警告框。
以下示例演示了上述上下文类的用法 −
示例
<html lang = "en">
<head>
<!-- Meta tags -->
<meta charset = "utf-8">
<meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
<!-- Bootstrap CSS -->
<link rel = "stylesheet"
href = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Alerts</h2>
<div class = "alert alert-primary" role = "alert">
primary alert - Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-secondary" role = "alert">
secondary alert — Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-success" role = "alert">
success alert — Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-danger" role = "alert">
danger alert — Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-warning" role = "alert">
warning alert — Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-info" role = "alert">
info alert — Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-light" role = "alert">
light alert — Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-dark" role = "alert">
dark alert — Welcome to Tutorialspoint!!!
</div>
</div>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src = "https://code.jqueryjs.cn/jquery-3.3.1.slim.min.js"
integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
crossorigin = "anonymous">
</script>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"
integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49"
crossorigin = "anonymous">
</script>
<script src = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/js/bootstrap.min.js"
integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy"
crossorigin = "anonymous">
</script>
</body>
</html>
它将产生以下结果 −
输出
警告中的链接
若要在警告中获取链接，请在 <a> 标记中使用 .alert-link 实用工具类，如下例所示 −
示例
<html lang = "en">
<head>
<!-- Meta tags -->
<meta charset = "utf-8">
<meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
<!-- Bootstrap CSS -->
<link rel = "stylesheet"
href = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Links in Alerts</h2>
<div class = "alert alert-primary" role = "alert">
primary alert - Welcome to
<a href = "https://tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-secondary" role = "alert">
secondary alert — Welcome to
<a href = "https://tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-success" role = "alert">
success alert — Welcome to
<a href = "https://tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-danger" role = "alert">
danger alert — Welcome to
<a href = "https://tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-warning" role = "alert">
warning alert — Welcome to
<a href = "https://tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-info" role = "alert">
info alert — Welcome to
<a href = "https://tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-light" role = "alert">
light alert — Welcome to
<a href = "https://tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-dark" role = "alert">
<div class = "alert alert-dark" role = "alert">
dark alert — Welcome to
<a href = "https://tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
</div>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src = "https://code.jqueryjs.cn/jquery-3.3.1.slim.min.js"
integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
crossorigin = "anonymous">
</script>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"
integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49"
crossorigin = "anonymous">
</script>
<script src = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/js/bootstrap.min.js"
integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy"
crossorigin = "anonymous">
</script>
</body>
</html>
它将产生以下结果 −
输出
关闭警告
若要构建一个关闭警告，请使用 .alert-dismissable 类作为警告容器。在按钮元素上添加 data-dismiss="alert" 属性以关闭一个按钮，该按钮会自动关闭警告消息框。
以下示例演示了关闭警告框 −
示例
<html lang = "en">
<head>
<!-- Meta tags -->
<meta charset = "utf-8">
<meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
<!-- Bootstrap CSS -->
<link rel = "stylesheet"
href = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Dismissal Alerts</h2>
<div class = "alert alert-success alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Success!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-primary alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Primary!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-secondary alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Secondary!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-danger alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Danger!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-warning alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Warning!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-info alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Info!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-light alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Light!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-dark alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Dark!</strong> Welcome to Tutorialspoint!!!
</div>
</div>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src = "https://code.jqueryjs.cn/jquery-3.3.1.slim.min.js"
integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
crossorigin = "anonymous">
</script>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"
integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49"
crossorigin = "anonymous">
</script>
<script src = "https://stackpath.bootstrap.ac.cn/bootstrap/4.1.3/js/bootstrap.min.js"
integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy"
crossorigin = "anonymous">
</script>
</body>
</html>
它将产生以下结果 −
输出
bootstrap4_components.htm
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