jQuery :lt() 选择器
定义和用法
：lt() 选择器选择索引号小于指定数字的元素。
索引号从 0 开始。
这主要与其他选择器一起使用，以选择组中的第一个元素（如上例所示）。
提示： 使用 :gt 选择器 选择索引号大于指定数字的元素。
语法
$(":lt(index)")
| 参数 | 描述 |
|---|---|
| index | 必需。指定要选择的元素。 选择索引号小于指定数字的元素。 |
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