## toUpper + [link](./toUpper "Link to this entry.") + [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L12796 "View in source.") + [npm](https://www.npmjs.com/package/lodash.toupper "See the npm package.") ``` _.toUpper([string='']) ``` 转换整体的字符串为大写 ### 参数 1. [string=''] (string) 要转换的字符串 ### 返回值 (string) 返回大写的字符串 ### 示例 ``` _.toUpper('--foo-bar'); // => '--FOO-BAR' _.toUpper('fooBar'); // => 'FOOBAR' _.toUpper('__foo_bar__'); // => '__FOO_BAR__' ```