1. Implement source code
The code copy is as follows:
<!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>JavaScript implementation gets the value of a column in the table</title>
<script type="text/javascript">
function getTdValue()
{
var tableId = document.getElementById("tab");
var str = "";
for(var i=1;i<tableId.rows.length;i++)
{
alert(tableId.rows[i].cells[1].innerHTML);
}
}
</script>
</head>
<body>
<table id="tab" onclick="getTdValue()" cellpadding="1" cellpacing="1">
<tr style="background-color:#CCC;">
<th>Student number</th>
<th>Name</th>
<th>Gender</th>
<th>Age</th>
</tr>
<tr>
<td>1</td>
<td>Li Si</td>
<td>Male</td>
<td>22</td>
</tr>
<tr>
<td>2</td>
<td>Wang Qian</td>
<td>Female</td>
<td>20</td>
</tr>
<tr>
<td>3</td>
<td>Yu Qian</td>
<td>Male</td>
<td>18</td>
</tr>
<tr>
<td>4</td>
<td>Liu Lang</td>
<td>Female</td>
<td>19</td>
</tr>
<tr>
<td>5</td>
<td>Zhuge Liang</td>
<td>Male</td>
<td>20</td>
</tr>
<tr>
<td>6</td>
<td>Oriental Cloud</td>
<td>Female</td>
<td>21</td>
</tr>
<tr>
<td>7</td>
<td>Gongsun Ce</td>
<td>Male</td>
<td>22</td>
</tr>
<tr>
<td>8</td>
<td>Baoqing</td>
<td>Female</td>
<td>23</td>
</tr>
<tr>
<td>9</td>
<td>Intellectual Education</td>
<td>Male</td>
<td>20</td>
</tr>
<tr>
<td>10</td>
<td>Liu Sisi</td>
<td>Female</td>
<td>21</td>
</tr>
</table>
</body>
</html>
2. Design results
(1) Initialization
(2) When clicking the second column