格式化

> 手机号4位分隔符
```js
formatMobile(13999999999) `139-9999-9999`

formatTrim

去空格

formatTrim(' mrgeeker  ')  `mrgeeker`

formatCamelCase

转驼峰

formatCamelCase('df sj')  `dfSj`
formatCamelCase('df-sj')  `dfSj`
formatCamelCase('df_sj')  `dfSj`

formatCamelCase

首字母大写

formatCapitalize('dfsj')  `Dfsj`

formatNumToUpper

金额大写

formatNumToUpper('1234')  `壹仟贰佰贰拾肆`

formatThousandSeparator

千分位分隔符

formatThousandSeparator('12345555.5555')  `12,345,555.556`