23 lines
980 B
JavaScript
23 lines
980 B
JavaScript
/* The same rule as money.py: 4 decimal places, round each line half up to cents. */
|
|
(function (root) {
|
|
function units(value) {
|
|
const s = String(value || '0').trim();
|
|
if (!/^\d+(\.\d{0,4})?$/.test(s)) throw new Error('数量和单价须为非负数字，最多四位小数');
|
|
const parts = s.split('.');
|
|
const n = BigInt(parts[0]) * 10000n + BigInt((parts[1] || '').padEnd(4, '0'));
|
|
if (n > 9999999990000n) throw new Error('数量或单价过大');
|
|
return n;
|
|
}
|
|
function lineCents(qty, price) {
|
|
const cents = (units(qty) * units(price) + 500000n) / 1000000n;
|
|
if (cents > 99999999999999n) throw new Error('金额过大');
|
|
return cents;
|
|
}
|
|
function format(cents) {
|
|
return (cents / 100n).toString() + '.' + (cents % 100n).toString().padStart(2, '0');
|
|
}
|
|
const api = {units, lineCents, format};
|
|
if (typeof module !== 'undefined') module.exports = api;
|
|
root.POMoney = api;
|
|
})(typeof window === 'undefined' ? globalThis : window);
|