form表单——radio单选

 <form action="" method="POST">
        <p>
            <span>性别：</span>
            <label for="man">男</label>
            <input type="radio" name="sex" id="man" checked value="男">
            <label for="woman"></label>
            <input type="radio" name="sex" id="woman" value="女">
        </p>
        <p></p>

    </form>