计算表格中，单元格中数值的得数

计算两个数的值：位置在代码中已标注！！！<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<link href="ddwh.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="JQuery/jquery-1.10.1.js"></script>
<script type="text/javascript">
$(function(){
var red_one = $(".red_one");
var red_two = $(".red_two");
var red_three = $(".red_three");
var red_four = $(".red_four");
var red_five = $(".red_five");
var red_six = $(".red_six");
var blue = $(".blue");

//计算red_one+blue的值，
var dan_one = red_one + blue;
alert(dan_one);

});
</script>
</head><body>
<table border="1">
<caption>大底围红</caption>
  <tr>
    <td rowspan="2" class="issue">期号</td>
    <td colspan="6" class="red">红球</td>
    <td rowspan="2">蓝球</td>
    <td colspan="33" class="weihong">围红</td>
    <td rowspan="2">验证</td>
  </tr>
  <tr>
    <td>一</td>
    <td>二</td>
    <td>三</td>
    <td>四</td>
    <td>五</td>
    <td>六</td>
    <td>01</td>
    <td>02</td>
    <td>03</td>
    <td>04</td>
    <td>05</td>
    <td>06</td>
    <td>07</td>
    <td>08</td>
    <td>09</td>
    <td>10</td>
    <td>11</td>
    <td>12</td>
    <td>13</td>
    <td>14</td>
    <td>15</td>
    <td>16</td>
    <td>17</td>
    <td>18</td>
    <td>19</td>
    <td>20</td>
    <td>21</td>
    <td>22</td>
    <td>23</td>
    <td>24</td>
    <td>25</td>
    <td>26</td>
    <td>27</td>
    <td>28</td>
    <td>29</td>
    <td>30</td>
    <td>31</td>
    <td>32</td>
    <td>33</td>
  </tr>
  <tr>
    <td class="issue">&nbsp;</td>
    <td class="red_one">05</td>
    <td class="red_two">06</td>
    <td class="red_three">12</td>
    <td class="red_four">14</td>
    <td class="red_five">19</td>
    <td class="red_six">23</td>
    <td class="blue">09</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
  </tr>
</table></body>
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