一个比较常用的数字格式化函数
背景 整理一个常用的数字格式化函数，具备常见的四舍五入、保留数位等功能 实现 import Decimal from 'decimal.js'; export const formatDigit = ( digit?: number | string | null, options?: { nilResult?: string; emptyStringResult?: string; nanResult?: string; zeroResult?: string | false; precision?: number | false; thousandSeparator?: boolean; }, ) => { const { nilResult = '-', emptyStringResult = nilResult, nanResult = nilResult, zeroResult = false, precision = false, thousandSeparator = false, } = options ?? {}; if (digit === null || digit === undefined) { return nilResult; } if (digit === '') { return emptyStringResult; } try { const number = new Decimal(digit); if (number.isNaN()) { return nanResult; } if (number.eq(0) && zeroResult !== false) { return zeroResult; } let str: string; if (precision !== false) { str = number.toFixed(precision); } else { str = number.toString(); } if (thousandSeparator) { return formatWithThousandSeparator(str); } return str; } catch (e) { return nanResult; } }; const formatWithThousandSeparator = (str: string) => { const [intPart, decPart] = str.split('.'); const intWithComma = intPart.replace(/\B(?=(\d{3})+(?!\d))/g, ','); return decPart !== undefined ? `${intWithComma}.${decPart}` : intWithComma; };