fix

src/money/numberToWords2.ts

 const digits = ['零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖'] as const
 const units = ['', '拾', '佰', '仟'] as const
 const units2 = ['', '万', '亿'] as const
-const units3 = ['角', '分', '厘'] as const
+const units3 = ['角', '分'] as const
 
 export default function numberToWords(input: string | number): string {
-  const number = Number(input)
-  if (number >= 10 ** 13) throw new Error('数字太大')
+  let [integer = '', decimal = ''] = String(input).split('.')
+  decimal = decimal.slice(0, 2)
+  const number = Number(integer + '.' + decimal)
+  if (number >= 10 ** 12) throw new Error('数字太大')
   if (number < 0) throw new Error('数字不能为负数')
   if (number === 0) return '零元整'
-  let [integer = '', decimal = ''] = String(number).split('.')
-  integer = integer.padStart(12, '0').slice(-12)
-  decimal = decimal.padEnd(2, '0').slice(0, 2)
+  ;[integer = '', decimal = ''] = String(number).split('.')
+  integer = integer.slice(-12)
+  decimal = decimal.slice(0, 2)
   let result = ''
   if (integer) {
     let preNull = true
@@ -39,7 +41,7 @@ export default function numberToWords(input: string | number): string {
     }
   }
   if (result) result += '元'
-  if (!decimal || decimal === '00') return result + '整'
+  if (!decimal) return result + '整'
   if (decimal) {
     for (let i = 0; i < decimal.length; i++) {
       const digit = digits[Number(decimal[i])]

test/money/numberToWords.test.ts

 import { describe, it, expect } from 'vitest'
-import numberToWords from '../../src/money/numberToWords'
-import numberToWords2 from '../../src/money/numberToWords2'
+import numberToWords2 from '../../src/money/numberToWords'
+import numberToWords from '../../src/money/numberToWords2'
 import numberToWords3 from '../../src/money/numberToWords3'
 
 describe('测试整数', () => {
@@ -229,6 +229,9 @@ describe('测试小数', () => {
 })
 
 describe('测试极端小数', () => {
+  it('0.001 toBe 零元整', () => {
+    expect(numberToWords(0.001)).toBe('零元整')
+  })
   it('1.001 toBe 壹元整', () => {
     expect(numberToWords(1.001)).toBe('壹元整')
   })
@@ -259,23 +262,14 @@ describe('小数整数', () => {
   it('839109939.677061 toBe 捌亿叁仟玖佰壹拾万零玖仟玖佰叁拾玖元陆角柒分', () => {
     expect(numberToWords(839109939.677061)).toBe('捌亿叁仟玖佰壹拾万零玖仟玖佰叁拾玖元陆角柒分')
   })
-  it('839109939.677061 toBe 捌亿叁仟玖佰壹拾万零玖仟玖佰叁拾玖元陆角柒分', () => {
-    expect(numberToWords2(839109939.677061)).toBe('捌亿叁仟玖佰壹拾万零玖仟玖佰叁拾玖元陆角柒分')
-  })
-  it('839109939.677061 toBe 捌亿叁仟玖佰壹拾万零玖仟玖佰叁拾玖元陆角柒分', () => {
-    expect(numberToWords3(839109939.677061)).toBe('捌亿叁仟玖佰壹拾万零玖仟玖佰叁拾玖元陆角柒分')
-  })
 })
 
 describe('测试特殊情况', () => {
   it('-1 toBe error', () => {
-    expect(numberToWords(-1)).toBe('负壹元整')
-  })
-  it('-1 toBe error', () => {
-    expect(() => numberToWords2(-1)).toThrowError('数字不能为负数')
+    expect(() => numberToWords(-1)).toThrowError()
   })
-  it('-1 toBe error', () => {
-    expect(numberToWords3(-1)).toBe('负壹元整')
+  it('1000000000000 toBe error', () => {
+    expect(() => numberToWords(1000000000000)).toThrowError()
   })
 })
 
@@ -284,7 +278,7 @@ describe('随机数测试', () => {
     for (let i = 0; i < 10000; i++) {
       const random = Math.random() * 1000000000000
       const result = numberToWords3(random)
-      const result2 = numberToWords2(random)
+      const result2 = numberToWords(random)
       expect(result).toBe(result2)
     }
   })