如何使用jQuery更改嵌套表td边框宽度？

Question

HTML

<hr />
<h1>Table-1</h1>
<hr />
<table class="tb1">
    <tr>
        <td>rw1</td>
        <td>rw1</td>
        <td>rw1</td>
    </tr>
    <tr>
        <td>rw1</td>
        <td>rw1</td>
        <td>rw1</td>
    </tr>
    <tr>
        <td colspan="3">
            <table class="tb2">
                <tr>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                </tr>
                <tr>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                </tr>
            </table>

        </td>
    </tr>
     <tr>
        <td>rw1</td>
        <td>rw1</td>
        <td>rw1</td>
    </tr>
    <tr>
        <td colspan="3">
            <table class="tb2">
                <tr>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                </tr>
                <tr>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                </tr>
            </table>            
        </td>
    </tr>
</table>

<hr />
<h1>Table-2</h1>
<hr />

<table class="tb1">
    <tr>
        <td>rw1</td>
        <td>rw1</td>
        <td>rw1</td>
    </tr>
    <tr>
        <td>rw1</td>
        <td>rw1</td>
        <td>rw1</td>
    </tr>
    <tr>
        <td colspan="3">
            <table class="tb2">
                <tr>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                </tr>
                <tr>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                </tr>
            </table>

        </td>
    </tr>
     <tr>
        <td>rw1</td>
        <td>rw1</td>
        <td>rw1</td>
    </tr>
    <tr>
        <td colspan="3">
            <table class="tb2">
                <tr>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                </tr>
                <tr>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                    <td>tbrw2</td>
                </tr>
            </table>            
        </td>
    </tr>
</table>

CSS

.tb1{
    border-collapse:collapse;
}

.tb1 tr td {
    border-bottom:1px solid #ccc;
    text-align:center;
    padding:10px;
}

.tb2{
    border-collapse:collapse;
}

.tb2 tr td {
    border-bottom:1px solid #f00;
    text-align:center;
    padding:10px;
}

JQUERY

$(".tb1 tr:last-child td,.tb2 tr:last-child td").css("border","none");

有很多像下面的图像，并使用jquery更改一些边框（我知道一点点jquery）但是边框有一些问题。 Jquery在最后一个tr中改变了所有td的边界。我对选择器错了。我该如何解决这个问题？

的jsfiddle

http://jsfiddle.net/g5qLc/

Answer 1

试试这个，

$(function(){
    $('table.tb2').find('tr td').css({'border-bottom':'1px solid red'});
    $('table.tb2').find('tr:last td').css({'border-bottom':'none'});
    $('table.tb2').closest('td').css({'border-bottom':'none'});
});

小提琴 http://jsfiddle.net/kTBum/3/

Answer 2

尝试tr:last-child>td仅影响最后一行内的细胞。

另请注意，您不应该使用jQuery。只需将其添加到您的CSS：

.tb1 tr:last-child>td,.tb2 tr:last-child>td {border:none}

Updated Fiddle

Answer 3

试试这个：

$(".tb2 tr:first-of-type").css("border-bottom","2px solid red");

我还将css更改为：

.tb2 tr td {
 text-align:center;
 padding:10px;
}

从原来的css：

.tb2 tr td {
border-bottom:1px solid #f00;
text-align:center;
padding:10px;
}

请参阅Demo