求代码问题
<!DOCTYPE HTML>
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<title>添加表格</title>
<style type="text/css">
table tr td,th(border:1px solid #000;)
</style>
</head>
<body>
<table summary="">
<tr>
<th>班级</th>
<th>学生数</th>
<th>平均成绩</th>
</tr>
<tr>
<td>一班</td>
<td>32</td>
<td>65</td>
</tr>
<tr>
<td>二班</td>
<td>54</td>
<td>98</td>
</tr>
</table>
</body>
</html>
