jQuery :odd 选择器
定义和用法
：odd 选择器选择每个具有奇数索引号的元素（如：1、3、5 等）。
索引号从 0 开始。
这主要与另一个选择器一起使用，以选择组中每个奇数索引的元素（如上例所示）。
提示：使用 :even 选择器选择具有偶数索引号的元素。
语法
$(":odd")
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