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@zmmbreeze
Last active December 31, 2021 02:45
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为数字加上单位:万或亿
/**
* 为数字加上单位:万或亿
*
* 例如:
* 1000.01 => 1000.01
* 10000 => 1万
* 99000 => 9.9万
* 566000 => 56.6万
* 5660000 => 566万
* 44440000 => 4444万
* 11111000 => 1111.1万
* 444400000 => 4.44亿
* 40000000,00000000,00000000 => 4000万亿亿
* 4,00000000,00000000,00000000 => 4亿亿亿
*
* @param {number} number 输入数字.
* @param {number} decimalDigit 小数点后最多位数,默认为2
* @return {string} 加上单位后的数字
*/
function addChineseUnit() {
var addWan = function(integer, number, mutiple, decimalDigit) {
var digit = getDigit(integer);
if (digit > 3) {
var remainder = digit % 8;
if (remainder >= 5) { // ‘十万’、‘百万’、‘千万’显示为‘万’
remainder = 4;
}
return Math.round(number / Math.pow(10, remainder + mutiple - decimalDigit)) / Math.pow(10, decimalDigit) + '万';
} else {
return Math.round(number / Math.pow(10, mutiple - decimalDigit)) / Math.pow(10, decimalDigit);
}
};
var getDigit = function(integer) {
var digit = -1;
while (integer >= 1) {
digit++;
integer = integer / 10;
}
return digit;
};
return function(number, decimalDigit) {
decimalDigit = decimalDigit == null ? 2 : decimalDigit;
var integer = Math.floor(number);
var digit = getDigit(integer);
// ['个', '十', '百', '千', '万', '十万', '百万', '千万'];
var unit = [];
if (digit > 3) {
var multiple = Math.floor(digit / 8);
if (multiple >= 1) {
var tmp = Math.round(integer / Math.pow(10, 8 * multiple));
unit.push(addWan(tmp, number, 8 * multiple, decimalDigit));
for (var i = 0; i < multiple; i++) {
unit.push('亿');
}
return unit.join('');
} else {
return addWan(integer, number, 0, decimalDigit);
}
} else {
return number;
}
};
}()
@zmmbreeze
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@asins Thx~ 已更新为digit = -1
之所以不用string,是不想做次转换和创建数组。

@lovelyelfpop
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给个英文的格式

// n 数字
// d 小数位数
function m(n, d) {
    var x = ('' + parseInt(n, 10)).length,
        d = Math.pow(10, d),
        arr = " kMGTPE";
    x -= x % 3;
    return Math.round(n * d / Math.pow(10, x)) / d + arr[x / 3].trim();
}

@panjiangyi
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panjiangyi commented Dec 31, 2021

这样更好

function transform(num) {
    const reg = /(\d)(\d)(\d{3})$/
    return `${num}`.replace(reg, `$1万$2千$3`)
}

transform(121235810)

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