源代码 ：
点击运行
<!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.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <div class="container-fluid"> <h1>Hello World!</h1> <p>创建三个相等宽度的列! 尝试在 class="row" 的 div 中添加新的 class="col" div，会显示四个等宽的列。</p> <div class="row"> <div class="col" style="background-color:lavender;">.col</div> <div class="col" style="background-color:orange;">.col</div> <div class="col" style="background-color:lavender;">.col</div> </div> </div> </body> </html>
运行结果