Bootstrap 提示
Bootstrap Alerts
Bootstrap Alerts用于提供创建预定义提示消息的简便方法。 Alert为您的消息添加了一种样式，以使其对用户更具吸引力。
在<div>元素内使用四个类来发出警报。
.alert-success
.alert-info
.alert-warning
.alert-danger
启动警报示例
<!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 rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Alerts</h2>
<div class="alert alert-success">
<strong>Success!</strong> this alert box indicates a successful or positive action.
</div>
<div class="alert alert-info">
<strong>Info!</strong> this alert box indicates a neutral informative change or action.
</div>
<div class="alert alert-warning">
<strong>Warning!</strong> this alert box indicates a warning that might need attention.
</div>
<div class="alert alert-danger">
<strong>Danger!</strong> this alert box indicates a dangerous or potentially negative action.
</div>
</div>
</body>
</html>
Bootstrap4 Alerts
Bootstrap 4在Bootstrap 3教程中定义的Bootstrap Alert中添加了4个新Alerts。
这些是:
Primary: 该警报框表示重要的操作。
Secondary: 此警报框指示次要操作。
Dark: 深灰色警报框。
Light: 浅灰色警报框。
使用.alert类创建警报，然后创建其中一个上下文类。
所有上下文类的列表:
.alert-success
.alert-info
.alert-warning
.alert-danger
.alert-primary
.alert-secondary
.alert-light
.alert-dark
示例
<!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 rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Alerts</h2>
<div class="alert alert-success">
<strong>Success!</strong> Used to indicate successful or positive action.
</div>
<div class="alert alert-info">
<strong>Info!</strong> Used to indicate a neutral informative change or action.
</div>
<div class="alert alert-warning">
<strong>Warning!</strong> Used to indicate a warning that might need attention.
</div>
<div class="alert alert-danger">
<strong>Danger!</strong> Used to indicate a dangerous or potentially negative action.
</div>
<div class="alert alert-primary">
<strong>Primary!</strong> Used to indicate an important action.
</div>
<div class="alert alert-secondary">
<strong>Secondary!</strong> Used to indicate a slightly less important action.
</div>
<div class="alert alert-dark">
<strong>Dark!</strong> Dark grey alert.
</div>
<div class="alert alert-light">
<strong>Light!</strong> Light grey alert.
</div>
</div>
</body>
</html>
Alerts链接
您必须将警报链接类添加到警报框内的任何链接，以创建"匹配的彩色链接":
示例:
<!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 rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Bootstrap Alert Links</h2>
<div class="alert alert-success">
<strong>Success!</strong> You should <a href="#" class="alert-link">read this message</a>.
</div>
<div class="alert alert-info">
<strong>Info!</strong> You should <a href="#" class="alert-link">read this message</a>.
</div>
<div class="alert alert-warning">
<strong>Warning!</strong> You should <a href="#" class="alert-link">read this message</a>.
</div>
<div class="alert alert-danger">
<strong>Danger!</strong> You should <a href="#" class="alert-link">read this message</a>.
</div>
<div class="alert alert-primary">
<strong>Primary!</strong> You should <a href="#" class="alert-link">read this message</a>.
</div>
<div class="alert alert-secondary">
<strong>Secondary!</strong> You should <a href="#" class="alert-link">read this message</a>.
</div>
<div class="alert alert-dark">
<strong>Dark!</strong> You should <a href="#" class="alert-link">read this message</a>.
</div>
<div class="alert alert-light">
<strong>Light!</strong> You should <a href="#" class="alert-link">read this message</a>.
</div>
</div>
</body>
</html>
关闭Alerts
如果要关闭警报消息，则必须向警报容器添加.alert-disableable类。然后将class="close"和data-dismiss ="alert"添加到链接或按钮元素(当您单击关闭符号时，警报框将关闭。)
示例:
<!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 rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Alerts</h2>
<div class="alert alert-success alert-dismissable">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Success!</strong> this alert box could indicate a successful or positive action.
</div>
<div class="alert alert-info alert-dismissable">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Info!</strong> this alert box could indicate a neutral informative change or action.
</div>
<div class="alert alert-warning alert-dismissable">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Warning!</strong> this alert box could indicate a warning that might need attention.
</div>
<div class="alert alert-danger alert-dismissable">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Danger!</strong> this alert box could indicate a dangerous or potentially negative action.
</div>
<div class="alert alert-primary alert-dismissable">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Primary!</strong> Indicates an important action.
</div>
<div class="alert alert-secondary alert-dismissable">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Secondary!</strong> Indicates a slightly less important action.
</div>
<div class="alert alert-dark alert-dismissable">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Dark!</strong> Dark grey alert.
</div>
<div class="alert alert-light alert-dismissable">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Light!</strong> Light grey alert.
</div>
</div>
</body>
</html>
Alerts动画
在关闭警报消息时，可以使用.fade和.show类添加淡入淡出效果。示例:
<!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 rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Animated Alerts Example</h2>
<div class="alert alert-success alert-dismissable fade show">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Success!</strong> this alert box could indicate a successful or positive action.
</div>
<div class="alert alert-info alert-dismissable fade show">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Info!</strong> this alert box could indicate a neutral informative change or action.
</div>
<div class="alert alert-warning alert-dismissable fade show">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Warning!</strong> this alert box could indicate a warning that might need attention.
</div>
<div class="alert alert-danger alert-dismissable fade show">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Danger!</strong> this alert box could indicate a dangerous or potentially negative action.
</div>
<div class="alert alert-primary alert-dismissable fade show">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Primary!</strong> Indicates an important action.
</div>
<div class="alert alert-secondary alert-dismissable fade show">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Secondary!</strong> Indicates a slightly less important action.
</div>
<div class="alert alert-dark alert-dismissable fade show">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Dark!</strong> Dark grey alert.
</div>
<div class="alert alert-light alert-dismissable fade show">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>Light!</strong> Light grey alert.
</div>
</div>
</body>
</html>
