单个flex项目的Bootstrap 4类占用可用空间
在Bootstrap4中，如果您希望flex项目占用可用空间，请使用flex-grow-|1类。
如果您希望第一个弹性项目占用空间，那么以下是代码-
<div class="d-flex mb-3"> <div class="p-2 flex-grow-1 bg-warning">One</div> <div class="p-2 bg-secondary">Two</div> <div class="p-2 bg-danger">Three</div> </div>
在上面可以看到，我在第一个div类中使用了flex-grow-1类-
<div class="p-2 flex-grow-1 bg-warning"> One </div>
以下是实现flex-grow-0|1类的示例-
示例
<!DOCTYPE html>
<html>
<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"
<div class="d-flex mb-3">
<div class="p-2 flex-grow-1 bg-warning">One</div>
<div class="p-2 bg-secondary">Two</div>
<div class="p-2 bg-danger">Three</div>
</div>
</div>
</body>
</html>