# js数字金额大写转换

## js数字金额大写转换，传入值number类型或string类型

``````export function convertNumberToChinese(amount: number | string) {
let n = Number(amount)
let fraction = ['角', '分']
let digit = ['零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖']
let unit = [
['元', '万', '亿'],
['', '拾', '佰', '仟'],
]
let head = n < 0 ? '欠' : ''
n = Math.abs(n)
let s = ''
for (let i = 0; i < fraction.length; i++) {
s += (digit[Math.floor(shiftRight(n, 1 + i)) % 10] + fraction[i]).replace(/零./, '')
}
s = s || '整'
n = Math.floor(n)
for (let i = 0; i < unit[0].length && n > 0; i++) {
let p = ''
for (let j = 0; j < unit[1].length && n > 0; j++) {
p = digit[n % 10] + unit[1][j] + p
n = Math.floor(shiftLeft(n, 1))
}
s = p.replace(/(零.)*零\$/, '').replace(/^\$/, '零') + unit[0][i] + s
}
return (
s
.replace(/(零.)*零元/, '元')
.replace(/(零.)+/g, '零')
.replace(/^整\$/, '零元整')
)
}
``````

## 移位的优化，防止出现精度不准的问题

``````// 向右移位
function shiftRight(number, digit) {
digit = parseInt(digit, 10)
let value = number.toString().split('e')
return +(value[0] + 'e' + (value[1] ? +value[1] + digit : digit))
}
``````
``````// 向左移位
function shiftLeft(number, digit) {
digit = parseInt(digit, 10)
let value = number.toString().split('e')
return +(value[0] + 'e' + (value[1] ? +value[1] - digit : -digit))
}
``````

## 输出结果

``````//柒仟陆佰捌拾贰元壹分
console.log(digitUppercase(7682.01))
//柒仟陆佰捌拾贰元整
console.log(digitUppercase(7682))
//玖仟伍佰壹拾肆亿叁仟肆佰陆拾柒万柒仟陆佰捌拾贰元整
console.log(digitUppercase(951434677682.00))
``````