源代码：
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<!DOCTYPE html> <html> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.net/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.net/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.net/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.net/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <div class="container mt-3"> <h1>Padding Left 工具</h1> <div class="pl-0 bg-warning">Padding Left 0</div> <div class="pl-1 bg-success">Padding Left 1</div> <div class="pl-2 bg-danger">Padding Left 2</div> <div class="pl-3 bg-primary">Padding Left 3</div> <div class="pl-4 bg-light">Padding Left 4</div> <div class="pl-5 bg-info">Padding Left 5</div> <br> <p>响应式 padding left 工具，重置浏览器大小查看效果。</p> <div class="pl-sm-5 bg-warning">Padding Left 5 on SM screens</div> <div class="pl-md-5 bg-success">Padding Left 5 on MD screens</div> <div class="pl-lg-5 bg-danger">Padding Left 5 on LG screens</div> <div class="pl-xl-5 bg-primary">Padding Left 5 on XL screens</div> </div> </body> </html>
运行结果：
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