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源代码：
点击运行
<!DOCTYPE html> <html> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta content="width=device-width, initial-scale=1" name="viewport"> <link href="//cdn.staticfile.net/twitter-bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"> <script src="//cdn.staticfile.net/jquery/3.2.1/jquery.min.js"></script> <script src="//cdn.staticfile.net/popper.js/1.12.5/umd/popper.min.js"></script> <script src="//cdn.staticfile.net/twitter-bootstrap/4.0.0/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>按钮元素</h2> <a class="btn btn-info" href="#" role="button">链接按钮</a> <button class="btn btn-info" type="button">按钮</button> <input class="btn btn-info" type="button" value="输入框按钮"> <input class="btn btn-info" type="submit" value="提交按钮"> </div> </body> </html>
运行结果