jQuery日本語リファレンス

各親要素の最後の子要素を選択します。

:lastセレクターが要素集合のうちから最後のひとつだけを選択するのに対し、:last-childは親要素毎の最後の子要素を選択します。

サンプル

サンプル1

<div>
 <span>John,</span>
 <span>Karl,</span>
 <span>Brandon,</span>
 <span>Sam</span>
</div>
<div>
 <span>Glen,</span>
 <span>Tane,</span>
 <span>Ralph,</span>
 <span>David</span>
</div>

$("div span:last-child")
 .css({color:"red", fontSize:"80%"})
 .hover(function () {
 $(this).addClass("solast");
 }, function () {
 $(this).removeClass("solast");
 });
 
$("div span:last")
 .css("background-color", "black");

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