jquery tablesort排序问题

有一组数据用的jquery tablesort插件排序单纯数字日期的排好了但是有组数据怎么都排不好谁能帮我下、数据如下其中--表示0：
58nGy/h
62nGy/h
68nGy/h
69nGy/h
72nGy/h
74nGy/h
75nGy/h
76nGy/h
80nGy/h
82nGy/h
88nGy/h
90nGy/h
92nGy/h
95nGy/h
97nGy/h
100nGy/h
102nGy/h
106nGy/h
106nGy/h
108nGy/h
110nGy/h
116nGy/h
120nGy/h
10nGy/h
16nGy/h
18nGy/h
--nGy/h
--nGy/h
jquery

解决方案 »

免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货

$(function() {
$("table").tablesorter({
textExtraction:function(node ){
var text=$(node).text()
return text=='--nGy/h'?'0':text;
}

});
});
我看了下是数字类型是可以排序的啊。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> 
 <title>MITYA.CO.UK  |  Scripts  |  Animated table sort (REGEXP friendly)</title>
 <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1" />
 <meta name="description" content="Mitya.co.uk - scripts, plugins and tutorials for Javascript, jQuery and PHP. Check out my web development blog for the latest updates." />
<meta name="keywords" content="web development, coding, Javascript, jQuery, plugins, AJAX, PHP, MySQL, database, UI, browsers, Opera, Internet Explorer, Firefox, Chrome, Safari, DOM, GD, REGEXP, regular expressions, Andy Croxall, mitya, table, sort, animation" />
 <meta name='robots' content='index, follow' /> 
<link rel="stylesheet" type="text/css" href="http://mitya.co.uk/scripts/../css/main.css" />
<link rel="stylesheet" type="text/css" href="http://mitya.co.uk/scripts/../css/codeColouring.css" />

<link rel='stylesheet' type='text/css' href='http://mitya.co.uk/scripts/../css/scriptDemos.css' />


<script type='text/javascript'>var SITE_ROOT = "http://www.mitya.co.uk";</script>
<script type="text/javascript" src="http://mitya.co.uk/scripts/../inc/js/jquery-1.6.1.min.js"></script>
<script type="text/javascript" src="http://mitya.co.uk/scripts/../inc/js/common.js"></script>

<script type="text/javascript" src="http://mitya.co.uk/scripts/../scripts/source/99.js"></script>

</head> <body>
 <script src='http://mitya.co.uk/scripts/source/111.js' type='text/javascript'></script>
<div class='scriptDemo'>
<table id='example1_table' class='table'><thead><tr><th><a class='bold' href="javascript:$('#example1_table').sortTable({onCol: 1, keepRelationships: true})">Place</a></th><th><a class='bold' href="javascript:$('#example1_table').sortTable({onCol: 2, keepRelationships: true})">County</a></th><th><a class='bold' href="javascript:$('#example1_table').sortTable({onCol: 3, keepRelationships: true, sortType: 'numeric'})">Phone code</a></th><th><a class='bold' href="javascript:$('#example1_table').sortTable({onCol: 4, keepRelationships: true, sortType: 'numeric'})">Approx. population</a></th></tr></thead><tbody><tr><td>Nottingham</td><td>Nottinghamshire</td><td>0115</td><td>58nGy/h</td></tr><tr><td>Luton</td><td>Bedfordshire</td><td>01582</td><td>203800</td></tr><tr><td>Huddersfield</td><td>Yorkshire</td><td>01484</td><td>106nGy/h</td></tr><tr><td>Carlisle</td><td>Cumbria</td><td>01228</td><td>103700</td></tr><tr><td>Brighton</td><td>East Sussex</td><td>01273</td><td>155919</td></tr><tr><td>Woking</td><td>Surrey</td><td>01483</td><td>62796 </td></tr><tr><td>Basingstoke</td><td>Hampshire</td><td>01256</td><td>--nGy/h</td></tr><tr><td>Rhyll</td><td>Clwyd</td><td>01745</td><td>--nGy/h</td></tr></tbody></table></div>

Here's the code applied to the links in the <th>s:

<div class='code'>
1//column 1 - by place name
2$('#example1_table').sortTable({
3     onCol: 1,
4     keepRelationships: true
5});
6//column 2 - by county
7$('#example1_table').sortTable({
8     onCol: 2,
9     keepRelationships: true
10});
11//column 3 - by phone code
12$('#example1_table').sortTable({
13     onCol: 3,
14     keepRelationships: true,
15     sortType: 'numeric'
16});
17//column 4 - by approx. population
18$('#example1_table').sortTable({
19     onCol: 4,
20     keepRelationships: true,
21     sortType: 'numeric'
22});</div>


</body>
</html>
额数字类型是可以   但是加上nGy/h之后顺序就乱了
实在不行debug 看下到底什么地方排序数据不对。。