jQuery :even 选择器
定义和用法
:even 选择器选择每个索引号为偶数的元素（如：0、2、4 等）。
索引号从 0 开始。
这通常与其他选择器一起使用，以选择组中每个偶数索引的元素（如上面的示例）。
提示：使用 :odd 选择器选择索引号为奇数的元素。
语法
$(":even")
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