可以得到HTML,为什么得不到VAL？

<tbody id="tbody1">
            <tr>
                <td>
                    <input id="chk" type="checkbox" name="chk" onclick="onchkClick();"/>
        </td>
                <td>
            <input type="text"  value="123" />
        </td>
                <td>
                    <input id="num" type="text" class="numberbox" precision="2" title="数量，0~2位小数" value="0" />
        </td>
                <td>
                    <input id="price" type="text" class="numberbox" precision="2" title="单位，0~2位小数" value="0" />
        </td>
                <td>
                    <input id="amount" type="text" class="numberbox" precision="2" readonly="readonly" value="0" />
        </td>
            </tr>

        </tbody>


  function setNumberBox(row) {

        $(row).find(".numberbox").each(function () {

            $(this).bind({
                blur: function () {
            alert($(this).parent().siblings("td:eq(1)").html());//正常抓到
                        alert($(this).parent().siblings("td:eq(1)").val());//抓不到