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# \_.flattenDepth(减少depth层嵌套)

**语法：**

```javascript
_.flattenDepth(array, [depth=1])
```

**源代码链接：**[source](https://github.com/lodash/lodash/blob/4.17.10/lodash.js#L7369)

**npm包链接：**[npm package](https://www.npmjs.com/package/lodash.flattendepth)

**描述：**

根据`depth`递归减少`array`的嵌套层级

**开始版本：**4.4.0

**参数：**

* `array (Array)`: 需要减少嵌套层级的数组。
* `[depth=1] (number)`:最多减少的嵌套层级数。

**返回值：**

* `array (Array)`: 返回减少嵌套层级后的新数组。

**例子：**

```javascript
var array = [1, [2, [3, [4]], 5]];

_.flattenDepth(array, 1);
// => [1, 2, [3, [4]], 5]

_.flattenDepth(array, 2);
// => [1, 2, 3, [4], 5]
```