时间:2021-07-01 10:21:17 帮助过:37人阅读
:last Selects the last matched element. Note that :last selects a single element by filtering the current jQuery collection and matching the last element within it. Additional Notes: Because :last is a jQuery extension and not part of the CSS specification, queries using :last cannot take advantage of the performance boost provided by the native DOM querySelectorAll() method. To achieve the best performance when using :last to select elements, first select the elements using a pure CSS selector, then use.filter(":last").
:last-child:
Selects all elements that are the last child of their parent.
<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> <script> $("div span:last-child") .css({color:"red", fontSize:"80%"}) .hover(function () { $(this).addClass("solast"); }, function () { $(this).removeClass("solast"); });
这两个选择器都是匹配集合中的最后一个元素,差别在于 :last 将匹配所有的集合中的最后一个元素。而 :last-child 将匹配集合中的所有位置为最后一个的子元素。:last 将永远返回一个元素,而 :last-child可能返回一批元素。
$('div p:last') 选择最后一个P元素并高亮显示得出结果如下:
<div> <p>Paragraph</p> <p>Paragraph</p> <p>Paragraph</p> </div> <div> <p>Paragraph</p> <p>Paragraph</p> <p>Paragraph</p> </div> <div> <p>Paragraph</p> <p>Paragraph</p> <p>Paragraph</p> </div>
$('div p:last-child') 将选择所有位于div最后一个p子元素,并高亮:
<div> <p>Paragraph</p> <p>Paragraph</p> <p>Paragraph</p> </div> <div> <p>Paragraph</p> <p>Paragraph</p> <p>Paragraph</p> </div> <div> <p>Paragraph</p> <p>Paragraph</p> <p>Paragraph</p> </div>
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