如何删除一个具有空类属性的表行？

Question

Greasemonkey脚本是否可以删除一个具有空类（<tr class="" ...>）的行？

问题是在<tbody>标记内部有两行具有空类。 要删除的行是第一行。

<table id="sort_table" class="tablesorter">
<thead>
    <tr>
        <th class="blacktext timesroman_italic">This</th>
        <th class="blacktext timesroman_italic">is a</th>
        <th class="blacktext timesroman_italic">header</th>
        <th class="blacktext timesroman_italic">row</th>
    </tr>
</thead>
<tbody>
    <!-- I WOULD LIKE TO DELETE FROM HERE -->
    <tr class="" valign="middle">
        <td class="bluetext timesroman align_middle">First</td>
        <td class="bluetext timesroman align_middle">blank</td>
        <td class="bluetext timesroman align_middle">class</td>
        <td class="bluetext timesroman align_middle">row</td>
    </tr>
    <!-- TO HERE -->

    <!-- BUT NOT FROM HERE -->
    <tr class="" valign="middle">
        <td class="bluetext timesroman align_middle">second</td>
        <td class="bluetext timesroman align_middle">blank</td>
        <td class="bluetext timesroman align_middle">class</td>
        <td class="bluetext timesroman align_middle">row</td>
    </tr>
    <tr class="someclass" valign="middle">
        <td class="bluetext timesroman align_middle">I gots</td>
        <td class="bluetext timesroman align_middle">me</td>
        <td class="bluetext timesroman align_middle">some</td>
        <td class="bluetext timesroman align_middle">class</td>
    </tr>
    <tr valign="middle">
        <td class="bluetext timesroman align_middle">no</td>
        <td class="bluetext timesroman align_middle">class</td>
        <td class="bluetext timesroman align_middle">attribute</td>
        <td class="bluetext timesroman align_middle">row</td>
    </tr>
    <!-- TO HERE -->
</tbody>
</table>

我想删除第一个“空白类”行。像这样：

这是我提出的伪代码，但我如何在脚本中执行此操作？ ：

• 转到id ==“sort_table”
的表格
• 忽略“thead”并转到“tbody”，可以是trCount＆gt; 1 //“thead”有一个“tr”所以它应该忽略一个“tr”跳到“thead”;
• 在“tbody”上，而trCountf＆lt; 2，删除trCountf行。 // trCountf＆lt; 2因为我们应该忽略“tbody”中的第二行

Answer 1

使用jQuery，您可以使用一行代码执行此操作：

$('#sort_table tbody tr:not([class!=""]):first').remove ();

请参阅"Select elements without any class"。

完整的Greasemonkey脚本将是这样的：

// ==UserScript==
// @name     _Remove the first body row that ain't got no class
// @include  http://YOUR_SERVER.COM/YOUR_PATH/*
// @require  http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js
// @grant    GM_addStyle
// ==/UserScript==
/*- The @grant directive is needed to work around a design change
    introduced in GM 1.0.   It restores the sandbox.
*/

$('#sort_table tbody tr:not([class!=""]):first').remove ();

或see the code at jsFiddle.