[Home](./index.md) > [@three3d/effect](./effect.md) > [getClosestIndex](./effect.getclosestindex.md) ## getClosestIndex() function 获取与 target 最近的索引 **Signature:** ```typescript export declare function getClosestIndex(sortedNums: ArrayLike, target: number): number; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | sortedNums | ArrayLike<number> | 按照从小到大顺序数字数组 | | target | number | 目标值 | **Returns:** number