表标签怎样才能让它显示表的线？请代码演示
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Conten-Type"content="text/html;charset=uft-8">
<title>认识table表标签</title>
</head>
<body>
<table>
<tr>
<th>班级</th>
<th>学生数</th>
<th>平均成绩</th>
</tr>
<tr>
<td>一班</td>
<td>30</td>
<td>89</td>
</tr>
<tr>
<td>二班</td>
<td>35</td>
<td>85</td>
</tr>
<tr>
<td>二班</td>
<td>35</td>
<td>85</td>
</tr>
</table>
</body>
</html>
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