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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container mt-3"> <h2>拨动开关</h2> <p>请尝试在切换和不切换开关的情况下提交表单。</p> <form action="/action_page.php"> <div class="form-check form-switch"> <input class="form-check-input" type="checkbox" id="mySwitch" name="darkmode" value="yes" checked> <label class="form-check-label" for="mySwitch">深色模式</label> </div> <button type="submit" class="btn btn-primary mt-3">提交</button> </form> </div> </body> </html>