# \_.defaultsDeep

**语法：**

```javascript
_.defaultsDeep(object, [sources])
```

**源代码链接：**[source](https://github.com/lodash/lodash/blob/4.17.10/lodash.js#L12835)

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

**描述：**

这个方法类似[`_.defaults`](https://lodash.com/docs/4.17.10#defaults)，除了它会递归分配默认属性。

> **注意:**这方法会改变`object`.

**开始版本：**3.10.0

**参数：**

* `object (Object)`: 目标对象。
* `[sources] (...Object)`: 来源对象。

**返回值：**

* `(Object)`: 返回 object。

**例子：**

```javascript
_.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
// => { 'a': { 'b': 2, 'c': 3 } }
```


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