做一个如下图的form表单：
我们的代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>表单练习</title>
</head>
<body leftmargin="400px" topmargin="200px">
<form method="post" action="http://www.baidu.com">
<table border="2px" heigth="200px">
<tr>
<td align="right">用户名：</td>
<td>
<input type="text" name="" id="" value="" placeholder="请输入用户名" />
</td>
</tr>
<tr>
<td align="right">密码：</td>
<td>
<input type="password" name="" id="" value="" placeholder="请输入密码" />
</td>
</tr>
<tr>
<td align="right">确认密码：</td>
<td>
<input type="password" name="" id="" value="" placeholder="请再次输入密码" />
</td>
</tr>
<tr>
<td align="right">验证码：</td>
<td>
<input type="text" name="" id="" value="" placeholder="请输入验证码" /><img src="1.gif" width="30px" />
</td>
</tr>
<tr>
<td align="right">性别：</td>
<td>
<input type="radio" name="r1" id="r1" checked="checked" value="" />
<lable for="r1">男</lable>
<input type="radio" name="r1" id="r2" value="" />
<lable for="r1">女</lable>
</td>
</tr>
<tr>
<td align="right">年龄：</td>
<td>
<input type="text" name="" id="" value="" placeholder="请输入年龄" />
</td>
</tr>
<tr>
<td align="right">爱好：</td>
<td>
<select name="" id="si" size="1" multiple="multiple">
<option value="">购物</option>
<option value="">上网</option>
<option value="">运动</option>
<option value="">看电影</option>
<option value="">听音乐</option>
</select>
</td>
</tr>
<tr>
<td align="right">你喜欢的游戏：</td>
<td>
<input type="checkbox" name="" id="c1" value="b1" />
<label for="c1">穿越火线</label>
<input type="checkbox" name="" id="c2" value="b2" checked="checked" />
<label for="c2">英雄联盟</label>
<input type="checkbox" name="" id="c3" value="b3" />
<label for="c3">逆战</label>
<input type="checkbox" name="" id="c4" value="b4" />
<label for="c1">守望先锋</label>
</td>
</tr>
<tr>
<td align="right">邮箱：</td>
<td>
<input id="" name="" value="" placeholder="请输入邮箱" />网易，腾讯 例: xx@qq.com
</td>
</tr>
<tr>
<td align="right">邮箱密码：</td>
<td>
<input type="password" name="" id="" value="" placeholder="请输邮箱入密码" />
</td>
</tr>
<tr>
<td align="center">
<input type="submit" name="" id="" value="提交" />
</td>
<td>
<input type="reset" name="" id="" value="重置" />
</td>
</tr>
</table>
</form>
</body>
</html>