运行截图如下：

代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>CN_TEST1</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!--    bootstrap css核心文件-->
    <link rel="stylesheet" href="bootstrap-4.4.1-dist/css/bootstrap.min.css">
<!--    bootstrap使用到了jquery，需要提前引用-->
    <script src="js/jquery-3.5.1.min.js"></script>
<!--    弹窗、提示、下拉菜单-->
    <script src="bootstrap-4.4.1-dist/js/bootstrap.bundle.js"></script>
<!--    bootstrap核心文件-->
    <script src="bootstrap-4.4.1-dist/js/bootstrap.min.js"></script>
</head>
<body>
    <div class="container-fluid">
        <ul class="list-group">
            <li class="list-group-item">First item</li>
            <li class="list-group-item">Second item</li>
            <li class="list-group-item">Third item</li>
        </ul>
        <br/>
        <ul class="list-group">
            <li class="list-group-item active">First item</li>
            <li class="list-group-item">Second item</li>
            <li class="list-group-item">Third item</li>
        </ul>
        <br/>
        <ul class="list-group">
            <li class="list-group-item disabled">First item</li>
            <li class="list-group-item">Second item</li>
            <li class="list-group-item">Third item</li>
        </ul>
        <br/>
        <div class="list-group">
            <a href="#" class="list-group-item list-group-item-action">First item</a>
            <a href="#" class="list-group-item list-group-item-action">Second item</a>
            <a href="#" class="list-group-item list-group-item-action">Third item</a>
        </div>
        <br/>
        <ul class="list-group list-group-flush">
            <li class="list-group-item disabled">First item</li>
            <li class="list-group-item">Second item</li>
            <li class="list-group-item">Third item</li>
        </ul>
        <br/>
<!--        水平列表组-->
        <ul class="list-group list-group-horizontal">
            <li class="list-group-item disabled">First item</li>
            <li class="list-group-item">Second item</li>
            <li class="list-group-item">Third item</li>
        </ul>
        <br/>
        <div class="list-group">
            <a href="#" class="list-group-item list-group-item-action">Item 1</a>
            <a href="#" class="list-group-item list-group-item-success">Item 2</a>
            <a href="#" class="list-group-item list-group-item-danger">Item 3</a>
            <a href="#" class="list-group-item list-group-item-info">Item 4</a>
            <a href="#" class="list-group-item list-group-item-warning">Item 5</a>
        </div>
    </div>
</body>
</html>

解释：

①创建列表组有2种方式，一种是在ul上架list-group类，然后在li上架list-group-item，或者在div上架group类，在a上架list-group-item；

②active来设置激活状态的列表；

③list-group-flush来删除列表的边框和圆角；

BootStrap笔记-列表组的使用

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