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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | 52x 52x 52x 39x 39x 42x 42x 39x 52x 13x 13x 11x 11x 13x 52x 52x | /**
* 格式化数字选项。
*/
export interface FormatNumberOptions {
/**
* 整数部分的千分位分隔符。
*
* @default ','
*/
thousandsSeparator?: string
/**
* 小数部分的千分位分隔符。
*
* @default ''
*/
thousandthsSeparator?: string
}
/**
* 格式化数字。
*
* @param value 要格式化的数字
* @param options 选项
* @returns 返回格式化后的数值
* @example
* ```typescript
* formatNumber(1314.56789) // => '1,314.56789'
* formatNumber(1314.56789, { thousandsSeparator: ' ' }) // => '1 314.56789'
* formatNumber(1314.56789, { thousandthsSeparator: ',' }) // => '1,314.567,89'
* ```
*/
export function formatNumber(
value: number,
options?: FormatNumberOptions,
): string {
const { thousandsSeparator = ',', thousandthsSeparator = '' } = options || {}
let [integer, decimal = ''] = String(Math.abs(value)).split('.')
if (thousandsSeparator !== '') {
let result = ''
while (integer.length > 3) {
result = `${thousandsSeparator}${integer.slice(-3)}${result}`
integer = integer.slice(0, integer.length - 3)
}
integer = `${integer}${result}`
}
if (thousandthsSeparator !== '') {
let result = ''
while (decimal.length > 3) {
result = `${result}${decimal.slice(0, 3)}${thousandthsSeparator}`
decimal = decimal.slice(3)
}
decimal = `${result}${decimal}`
}
const numeral = `${value < 0 ? '-' : ''}${integer}${
decimal ? `.${decimal}` : ''
}`
return numeral
}
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