## lowerCase + [link](./lowerCase "Link to this entry.") + [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L12230 "View in source.") + [npm](https://www.npmjs.com/package/lodash.lowercase "See the npm package.") ``` _.lowerCase([string='']) ``` 以空格分开单词并转换为小写。 ### 参数 1. [string=''] (string) 要转换的字符串 ### 返回值 (string) 返回小写的字符串 ### 示例 ``` _.lowerCase('--Foo-Bar'); // => 'foo bar' _.lowerCase('fooBar'); // => 'foo bar' _.lowerCase('__FOO_BAR__'); // => 'foo bar' ```