## flattenDepth + [link](./flattenDepth "Link to this entry.") + [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L5973 "View in source.") + [npm](https://www.npmjs.com/package/lodash.flattendepth "See the npm package.") ``` _.flattenDepth(array, [depth=1]) ``` 根据 `depth` 递归展平 `数组` 的层级 ### 参数 1. array (Array) 需要展平的数组 2. [depth=1] (number) 展平的层级 ### 返回值 (Array) 返回展平后的新数组 ### 示例 ``` var array = [1, [2, [3, [4]], 5]]; _.flattenDepth(array, 1); // => [1, 2, [3, [4]], 5] _.flattenDepth(array, 2); // => [1, 2, 3, [4], 5] ```