如何实现Bootstrap 4 .flex-*-nowrap类
flex-*-nowrap类的工作方式类似于flex-no-wrap类，以避免包装flex项。
但是，如果您希望避免在不同的屏幕尺寸上换行，请使用flex-*-no-wrap类，例如-
flex-lg-nowrap：避免在大屏幕上换行
flex-sm-nowrap：避免在小屏幕尺寸上包装
flex-md-nowrap：避免在中等屏幕尺寸上换行
以下是实现flex-*-nowrap类的示例-
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/4.1.0/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container mt-3">
<p>Flex items will wrap</p>
<div class="d-flex flex-wrap bg-warning">
<div class="p-2 border">One</div>
<div class="p-2 border">Two</div>
<div class="p-2 border">Three</div>
<div class="p-2 border">Four</div>
<div class="p-2 border">Five</div>
<div class="p-2 border">Six</div>
<div class="p-2 border">Seven</div>
<div class="p-2 border">Eight</div>
<div class="p-2 border">Nine</div>
<div class="p-2 border">Ten</div>
<div class="p-2 border">Eleven</div>
<div class="p-2 border">Twelve</div>
<div class="p-2 border">Thirteen</div>
<div class="p-2 border">Fourteen</div>
</div><br>
<p>Flex items won't wrap (small screen size)</p>
<div class="d-flex flex-sm-nowrap bg-danger">
<div class="p-2 border">One</div>
<div class="p-2 border">Two</div>
<div class="p-2 border">Three</div>
<div class="p-2 border">Four</div>
<div class="p-2 border">Five</div>
<div class="p-2 border">Six</div>
<div class="p-2 border">Seven</div>
<div class="p-2 border">Eight</div>
<div class="p-2 border">Nine</div>
<div class="p-2 border">Ten</div>
<div class="p-2 border">Eleven</div>
<div class="p-2 border">Twelve</div>
<div class="p-2 border">Thirteen</div>
<div class="p-2 border">Fourteen</div>
</div><br>
<p>Flex items won't wrap (medium screen size)</p>
<div class="d-flex flex-md-nowrap bg-success">
<div class="p-2 border">One</div>
<div class="p-2 border">Two</div>
<div class="p-2 border">Three</div>
<div class="p-2 border">Four</div>
<div class="p-2 border">Five</div>
<div class="p-2 border">Six</div>
<div class="p-2 border">Seven</div>
<div class="p-2 border">Eight</div>
<div class="p-2 border">Nine</div>
<div class="p-2 border">Ten</div>
<div class="p-2 border">Eleven</div>
<div class="p-2 border">Twelve</div>
<div class="p-2 border">Thirteen</div>
<div class="p-2 border">Fourteen</div>
</div>
</div>
</body>
</html>