代码示例：（标识：bs_flex-justify）
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap 实例</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/js/bootstrap.bundle.js"></script>
</head>
<body>
<div class="p-4">
<h2>对齐内容</h2>
<p>使用 .justify-content-* 类可改变弹性项目的对齐方式：</p>
<div class="d-flex justify-content-start bg-secondary mb-3">
<div class="p-2 bg-info">弹性项目 1</div>
<div class="p-2 bg-warning">弹性项目 2</div>
<div class="p-2 bg-primary">弹性项目 3</div>
</div>
<div class="d-flex justify-content-end bg-secondary mb-3">
<div class="p-2 bg-info">弹性项目 1</div>
<div class="p-2 bg-warning">弹性项目 2</div>
<div class="p-2 bg-primary">弹性项目 3</div>
</div>
<div class="d-flex justify-content-center bg-secondary mb-3">
<div class="p-2 bg-info">弹性项目 1</div>
<div class="p-2 bg-warning">弹性项目 2</div>
<div class="p-2 bg-primary">弹性项目 3</div>
</div>
<div class="d-flex justify-content-between bg-secondary mb-3">
<div class="p-2 bg-info">弹性项目 1</div>
<div class="p-2 bg-warning">弹性项目 2</div>
<div class="p-2 bg-primary">弹性项目 3</div>
</div>
<div class="d-flex justify-content-around bg-secondary mb-3">
<div class="p-2 bg-info">弹性项目 1</div>
<div class="p-2 bg-warning">弹性项目 2</div>
<div class="p-2 bg-primary">弹性项目 3</div>
</div>
</div>
</body>
</html>
