关于JQ遍历取值保存的有关问题

关于JQ遍历取值保存的问题
我写了一个遍历DOM并取值赋值给数组,以下代码存在错误

是否可以保存成JSON呢?如果保存成JSON怎么写



HTML code

<!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>无标题文档</title>
<style>
    body{ font-size:12px;}
    #tb1 { width:1000px; float: left;}
    #tb1 span{ float:left; text-align:center;}
    #tb1 span input{ width:20px;}
    #tb2 { width:1000px; float: left;}
    #tb2 span{ width:32px; border-right:solid 1px #CCC;  float:left;}
    #tb2 span input{ width:10px;}
    .qujian_td{ width:80px;}
    .kuohao{ padding-left:15px; padding-right:15px;}
</style>
</head>
<script type="text/javascript" src="http://127.0.0.5/includes/libraries/javascript/jquery.js" charset="utf-8"></script>
<body>
<table cellspacing="0" cellpadding="0">
    <tr class="tb1">
        <td width="95">0<span class="kuohao">≤</span>
            <input type="text" class="qujian" onkeyup="num_v();" style="width:30px;" maxlength="5" /></span></td>
        <td><a href="javascript:;" class="add">增加</a></td>
    </tr>
    <tr>
        <td align="left">&nbsp;&nbsp;<input type="text" class="shibiema" style="width:30px;" onkeyup="num_v();" maxlength="5" /></td>
        <td id="add_a">&nbsp;</td>
    </tr>
    
    <tr class="tb1">
        <td width="95">0<span class="kuohao">≤</span>
            <input type="text" class="qujian" onkeyup="num_v();" style="width:30px;" maxlength="5" /></span></td>
        <td><a href="javascript:;" class="add">增加</a></td>
    </tr>
    <tr>
        <td align="left">&nbsp;&nbsp;<input type="text" class="shibiema" style="width:30px;" onkeyup="num_v();" maxlength="5" /></td>
        <td id="add_a">&nbsp;</td>
    </tr>

    <tr class="tb1">
        <td width="95">0<span class="kuohao">≤</span>
            <input type="text" class="qujian" onkeyup="num_v();" style="width:30px;" maxlength="5" /></span></td>
        <td><a href="javascript:;" class="add">增加</a></td>
    </tr>
    <tr>
        <td align="left">&nbsp;&nbsp;<input type="text" class="shibiema" style="width:30px;" onkeyup="num_v();" maxlength="5" /></td>
        <td id="add_a">&nbsp;</td>
    </tr>
    
    <tr>
        <td colspan="2" align="left" onclick="save_data();">保存</td>
    </tr>
    
</table>
<script>
$(document).ready(function(){
    $(".add").click(function(){
        $(this).parent().before("<td class=\"qujian_td\"><span class=\"kuohao\">≤</span><input type=\"text\" class=\"qujian\" onkeyup=\"num_v();\" style=\"width:30px;\" maxlength=\"5\" /></span></td>");
        $(this).parent().parent().next().find("#add_a").before("<td><input type=\"text\" class=\"shibiema\" style=\"width:30px;\" onkeyup=\"num_v();\" maxlength=\"5\" /></td>");
    });

});
    function num_v(){
        $(".shibiema").each(function(i) {  
            $(this).val($(this).val().replace(/[^\d]/g,''));
        }); 
        $(".qujian").each(function(i) {  
            $(this).val($(this).val().replace(/[^\d]/g,''));
        });  
    }
    function save_data(){
        var mydata=new Array()

        $(".tb1").each(function(h) {
            $(this).find(".qujian").each(function(i) {
                mydata[h][i][0]=$(this).val();
            }); 
            $(this).next().find(".shibiema").each(function(i) {  
                mydata[h][i][1]=$(this).val();
            });
            
            
        });
        alert(mydata);
    }
</script>
</body>
</html>