例子:
<table>
<tr>
<th>Bacon</th>
<th>Tuna</th>
<th>Padas</th>
<th>Another</th>
<th>Name</th>
</tr>
</table>
页面加载后如何获取列位置
$(document).ready(function() {
bla..bla
});
输出将是bacon = 0, tuna = 1 padas = 2
等等......