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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.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> <nav class="navbar navbar-expand-sm bg-dark navbar-dark"> <form class="form-inline"> <input class="form-control" type="text" placeholder="Search"> <button class="btn btn-success" type="button">Search</button> </form> </nav> <br> <div class="container"> <h3>导航栏的表单</h3> <p>导航栏的表单 form 元素使用 class="form-inline" 类来排版输入框与按钮：</p> </div> </body> </html>
运行结果：