javascript - JQuery : find tr(class = x) get td(class =y) count td variables and attribute, 而不是相应地更改 tr

Question

<table class="tbl">
<tr>td class= "colorcode" colspan ="5"/><tr>
<tr class="ms.alternative>
<td></td>
<td class="bkcolor"></td>
<td class="bkcolor"></td>
<td class="bkcolor"></td>
<td> </td>
</tr>
<tr><td colspan="5"/></tr>


 <tr>td class= "colorcode" colspan ="5"/><tr>
<tr class="ms.alternative>
<td></td>
<td class="bkcolor"></td>
<td class="bkcolor"></td>
<td class="bkcolor"></td>
<td></td>
</tr>
<tr><td colspan="5"/></tr>


<tr>td class= "colorcode" colspan ="5"/><tr>
<tr class="ms.alternative>
<td></td>
<td class="bkcolor"></td>
 <td class="bkcolor"></td>
<td class="bkcolor"></td>
<td></td>
</tr>
<tr><td colspan=""/></tr>

</table>

我是 jquery 的新手..请帮我弄明白。

在上面的场景中:

现在我的问题是:您将如何使用

选择所有 tr

class ms.alternative than find(td.bkcolor)
get the color of <td.bkcolor>

现在，如果:

 (number of majority of background color of '`tr.ms.alternative`' '`td.bkcolor`' 
 is red)
 {
     change td.colorcode.css(background-color:'red')
 }

Answer 1

$('tr[class="ms.alternative"]').find('td[class="bkcolor"]').css("background-color");

将为您提供背景颜色

 $('tr[class="ms.alternative"]').find('td[class="bkcolor"]').css("background-color","new color");

会改变你的背景颜色