# \_.mixin

**语法：**

```javascript
_.mixin([object=lodash], source, [options={}])
```

**源代码链接：**[source](https://github.com/lodash/lodash/blob/4.17.10/lodash.js#L15686)

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

**描述：**

添加来源对象自身的所有可枚举函数属性到目标对象。 如果`object`是个函数，那么函数方法将被添加到原型链上。

> **注意:**使用[`_.runInContext`](https://lodash.com/docs/4.17.10#runInContext)来创建原始的`lodash`函数来避免修改造成的冲突。

**开始版本：**0.1.0

**参数：**

* `[object=lodash] (Function|Object)`: 目标对象。
* `source (Object)`: 来源对象。
* `[options={}] (Object)`: 选项对象。
* `[options.chain=true] (boolean)`: 是否开启链式操作。

**返回值：**

* `(*)`: 返回 object.

**例子：**

```javascript
function vowels(string) {
  return _.filter(string, function(v) {
    return /[aeiou]/i.test(v);
  });
}

_.mixin({ 'vowels': vowels });
_.vowels('fred');
// => ['e']

_('fred').vowels().value();
// => ['e']

_.mixin({ 'vowels': vowels }, { 'chain': false });
_('fred').vowels();
// => ['e']
```


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