我有这样的 div 结构
<div class="items">
    <div class="itemRow">
        <div class="item">
        <div class="item">
        <div class="item">
    </div>
    <div class="itemRow">
        <div class="item">
        <div class="item">
        <div class="item">
    </div>
</div>
如何让它们合并/组合两个 div“itemRow”?变成这样
<div class="items">
    <div class="itemRow">
        <div class="item">
        <div class="item">
        <div class="item">
        <div class="item">
        <div class="item">
        <div class="item">
    </div>
</div>
使用 jQuery