我需要帮助形成一个 jquery 选择器来返回缺少特定子元素的元素。
给定以下 HTML 片段:
<div id="rack1" class="rack">
<span id="rackunit1" class="rackspace">
<span id="component1">BoxA</span>
<span id="label1">Space A</span>
</span>
<span id="rackunit2" class="rackspace">
<span id="label2">Space B</span>
</span>
<span id="rackunit3" class="rackspace">
<span id="component2">BoxA</span>
<span id="label3">Space C</span>
</span>
</div>
<div id="rack2" class="rack">
<span id="rackunit4" class="rackspace">
<span id="component3">BoxC</span>
<span id="label4">Space D</span>
</span>
<span id="rackunit5" class="rackspace">
<span id="label5">Space E</span>
</span>
<span id="rackunit6" class="rackspace">
<span id="component4">BoxD</span>
<span id="label6">Space F</span>
</span>
</div>
为我找到没有组件跨度的机架单元跨度。到目前为止,我有: $(".rack .rackspace") 让我获得所有的机架单元跨度,不知道如何排除具有组件跨度的那些或只选择那些没有的...