jQuery :last 选择器
定义和用法
:last 选择器选择最后一个元素。
注意：此选择器只能选择一个元素。使用 :last-child 选择器选择多个元素（每个父元素一个）。
这主要与其他选择器一起使用，以选择组中的最后一个元素（如上面的示例）。
提示：要选择组中的第一个元素，请使用 :first 选择器。
语法
$(":last")
亲自试一试 - 示例
:last 和 :last-child 之间的区别
显示 :last 和 :last-child 选择器之间的区别。
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