> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xray.cool/llms.txt
> Use this file to discover all available pages before exploring further.

# upper

> `upper`函数主要是用来 string 中的小写字母转换成大写

## 函数原型

`func upper(s1 string) string`

### 参数介绍

| 参数名称 | 参数介绍 |
| - | - |
| `s1` | 待转换数据 |

## 举例

| 待转换数据 | 转换语句 | 输出结果 |
| - | - | - |
| `asdf` | `upper("asdf")` | `ASDF` |


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