jQuery :eq() 选择器
定义和用法
：eq() 选择器用于选择具有特定索引号的元素。
索引号从 0 开始，因此第一个元素的索引号为 0（而不是 1）。
这主要与其他选择器一起使用，以选择组中特定索引的元素（如上例所示）。
语法
$(":eq(index)")
| 参数 | 描述 |
|---|---|
| index | 必需。指定元素的索引。 |
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