应该是使用了变量吧?<table>
<tr>
<th>一</th>
<th>二</th>
</tr>
<tr>
<td>三</td>
<td>四</td>
</tr>
<tr>
<td>五</td>
<td>六</td>
</tr>
</table>
<tr>
<th>一</th>
<th>二</th>
</tr>
<tr>
<td>三</td>
<td>四</td>
</tr>
<tr>
<td>五</td>
<td>六</td>
</tr>
</table>
<!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>test</title>
<script src="jquery-1.3.2.js"></script>
<script>
$(function(){
$("#btn").click(function(){
var all_tr = $("table tr");
all_tr.each(function(){
var text = $(this).children().eq(0).text();
alert(text)
});
});
});
</script>
</head><body>
<table>
<tr>
<th>一</th>
<th>二</th>
</tr>
<tr>
<td>三</td>
<td>四</td>
</tr>
<tr>
<td>五</td>
<td>六</td>
</tr>
</table>
<input type="button" id="btn" value="第一列" />
</body>
</html>
$(document).ready(function(){
for(var j=0;j<$("#tb1 tr").length;j++){
alert($("#tb1 tr:eq("+j+")").children("td:eq(0)").html());
}})
</script>
tb1为表格的id名 ,上面的列子是获取表格的第一列