js 简单的货币单位转换

const toCurrency = (n, curr, LanguageFormat = undefined) =>
  Intl.NumberFormat(LanguageFormat, { style: 'currency', currency: curr }).format(n);

// 例子
toCurrency(123456.789, 'EUR'); // €123,456.79
toCurrency(123456.789, 'USD', 'en-us'); // $123,456.79
toCurrency(123456.789, 'USD', 'fa'); // ۱۲۳٬۴۵۶٫۷۹
toCurrency(322342436423.2435, 'JPY'); // ¥322,342,436,423