我需要输入数量后得到对应的是哪个的bid,前提这些tr除了值不一样,name,id都完全一样

 <table border="1px">
                    <tr >
                        <td class="thumb">图片</td>
                        <td class="title" name="bname">书名1</td>
                        <td style="display: none;" name="tBid" id="tBid">1</td>
                        <td><input class="input-text" type="text" name="nums" value="请输入购买数量1" id="shopCount"/></td>
                        <td>￥<span id="shopPrice" name="shopPrice">12.4</span></td>
                    </tr>
                    <tr >
                        <td class="thumb">图片</td>
                        <td class="title" name="bname">书名2</td>
                        <td style="display: none;" name="tBid">2</td>
                        <td><input class="input-text" type="text" name="nums" value="请输入购买数量2" id="shopCount"/></td>
                        <td>￥<span id="shopPrice" name="shopPrice">14</span></td>
                    </tr>
                    <tr >
                        <td class="thumb">图片</td>
                        <td class="title" name="bname">书名3</td>
                        <td style="display: none;" name="tBid">3</td>
                        <td><input class="input-text" type="text" name="nums" value="请输入购买数量3" id="shopCount"/></td>
                        <td>￥<span id="shopPrice" name="shopPrice">15</span></td>
                    </tr>
        </table>

jQuery选择器 $("tr:eq("+i+")")//i是一个整数，相当于访问数组一样，0表示第一个tr

var listTr=document.getElemntsByTagName("tr")
listTr[i];这样访问也可以

应该通过dom关系获取，id一样不好获取。。可以去掉

 <script>
    function inputBlur(ipt) {
        var tr = ipt.parentNode.parentNode;
        alert('ID:'+tr.cells[2].innerHTML)
    }
</script>
<table border="1px">
    <tr>
        <td class="thumb">图片</td>
        <td class="title" name="bname">书名1</td>
        <td style="display: none;" name="tBid" id="tBid">1</td>
        <td><input class="input-text" type="text" name="nums" value="请输入购买数量1" id="shopCount" onblur="inputBlur(this)" /></td>
        <td>￥<span id="shopPrice" name="shopPrice">12.4</span></td>
    </tr>
    <tr>
        <td class="thumb">图片</td>
        <td class="title" name="bname">书名2</td>
        <td style="display: none;" name="tBid">2</td>
        <td><input class="input-text" type="text" name="nums" value="请输入购买数量2" id="shopCount" onblur="inputBlur(this)" /></td>
        <td>￥<span id="shopPrice" name="shopPrice">14</span></td>
    </tr>
    <tr>
        <td class="thumb">图片</td>
        <td class="title" name="bname">书名3</td>
        <td style="display: none;" name="tBid">3</td>
        <td><input class="input-text" type="text" name="nums" value="请输入购买数量3" id="shopCount" onblur="inputBlur(this)" /></td>
        <td>￥<span id="shopPrice" name="shopPrice">15</span></td>
    </tr>
</table>