> For the complete documentation index, see [llms.txt](https://lodash.shujuwajue.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lodash.shujuwajue.com/string/lowercase.md).

# \_.lowerCase（空格分开单词并转小写）

**语法：**

```javascript
_.lowerCase([string=''])
```

**源代码链接：**[source](https://github.com/lodash/lodash/blob/4.17.10/lodash.js#L14324)

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

**描述：**

转换字符串`string`以空格分开单词，并转换为小写。

**开始版本：**4.0.0

**参数：**

* `[string=''] (string)`: 要转换的字符串。

**返回值：**

* `(string)`: 返回转换后的字符串。

**例子：**

```javascript
_.lowerCase('--Foo-Bar--');
// => 'foo bar'

_.lowerCase('fooBar');
// => 'foo bar'

_.lowerCase('__FOO_BAR__');
// => 'foo bar'
```