<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Sample Form</title>
</head>
<body>
<h2>表单</h2>
<form action="/" method="post">
<!-- 文本输入框 -->
<label for="name">用户名:</label>
<input type="text" id="name" name="name" required>
<br>
<!-- 密码输入框 -->
<label for="password">密码:</label>
<input type="password" id="password" name="password" required>
<!-- 单选按钮 -->
<label>性别:</label>
<input type="radio" id="male" name="gender" value="male" checked>
<label for="male">男</label>
<input type="radio" id="female" name="gender" value="female">
<label for="female">女</label>
<!-- 复选框 -->
<input type="checkbox" id="subscribe" name="subscribe" checked>
<label for="subscribe">订阅推送信息</label>
<!-- 下拉列表 -->
<label for="country">国家:</label>
<select id="country" name="country">
<option value="cn">CN</option>
<option value="usa">USA</option>
<option value="uk">UK</option>
</select>
<!-- 提交按钮 -->
<input type="submit" value="提交">
</form>
</body>
</html>
输入 JavaScript 代码……
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