整数缝三
function fnInttrunt(number) {
let intPart = Number(number)|0; //获取整数部分
return intPart.toString().replace(/(\d)(?=(?:\d{3})+$)/g, ‘$1,‘)
}
小数逢三
function fnfloattrunt(number) {
let intPart = Number(number);
return intPart.toString().replace(/\d(?=(\d{3})+\.)/g,‘$&,‘);
}
原文：https://www.cnblogs.com/xiaolanschool/p/11148869.html