今天是第三天在中文网学习！
代码：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>3月19号作业</title> </head> <body> <form action="" method="post"> <table border="0" cellspacing="0" cellpadding="8" width="400" bgcolor="powderblue"> <caption><h2>用户注册</h2></caption> <tr><td colspan="2"><hr></td></tr> <tr> <td width="60"><label for="rd_name">邮箱:</label></td> <td width="300"><input type="text" id="rd_name" name="name" value="" placeholder="example@mail.com" size="30" width="200"></td> </tr> <tr> <td><label for="rd_password">密码:</label></td> <td><input type="text" id="rd_password" name="password" value="" placeholder="字母+数字不少于10位" size="30"></td> </tr> <tr> <td>性别:</td> <td> <input type="radio" name="sex" value="male" id="rd_male"><label for="rd_male">男</label> <input type="radio" name="sex" value="female" id="rd_female"><label for="rd_female">女</label> <input type="radio" name="sex" value="secret" id="rd_secret" checked=""><label for="rd_secret">保密</label> </td> </tr> <tr> <td>兴趣:</td> <td> <input type="checkbox" name="hobby[1]" value="html" id="rd_html"><label for="rd_html">HTML</label> <input type="checkbox" name="hobby[2]" value="css" id="rd_css"><label for="rd_css">CSS</label> <input type="checkbox" name="hobby[4]" value="php" id="rd_php" checked=""><label for="rd_php">PHP</label> </td> </tr> <tr> <td><label for="level">级别:</label></td> <td> <select name="level" id="level" style="display: inline-block;width: 243px;height: 21px"> <option value="">小白</option> <option value="" selected="">菜鸟</option> <option value="">高手</option> <option value="">专家</option> </select> </td> </tr> <tr> <td><label for="rd_photo">头像:</label></td> <td> <img src="../images/13.jpg" height="30"> <input type="file" id="rd_photo" name="photo" accept="image/*"> </td> </tr> <tr> <td valign="middle"><label>简介:</label></td> <td><textarea name="comment" id="comment" rows="5" cols="40" placeholder="文明上网,理性发言"></textarea></td> </tr> <tr> <td colspan="2"> <hr> <input type="submit" name="submit" value="提交"> <input type="reset" name="reset" value="重填"> </td> </tr> </table> </form> </body> </html> <!--问题 1.input标签里的value属性的值必须是小写吗？ 2.input标签里的checkbox类型的name写成hobby[1]和hobby[]的区别是什么？产生的效果有何不同 -->
手写代码：
