js拼接json

<table class="finance">
<tr class="finance_color">
<td>时间</td>
<td>价格</td>
</tr>
<tbody id="pa_json_el">
<c:forEach items="${pricePd.paJsons}" var="item">
<tr>
<td><input type="text" class="second"
value="${item.second}" /> 秒</td>
<td>￥<input type="text" class="price"
value="${item.price }" />
</td>
</tr>
</c:forEach>
</tbody>
</table>

<script type="text/javascript">

//申明一个json存储

var paJson = "[";
$("#pa_json_el tr").each(function() {
var second = $(this).find(".second").val();
var price = $(this).find(".price").val();
paJson += "{'second':" + price + ",'price':" + price + "},";
});
paJson = paJson.substring(0, paJson.length - 1) + "]";

</script>