javascript金额千分位的实现

/*
* formatMoney(s,type)
* 功能：金额按千位逗号分割
* 参数：s，需要格式化的金额数值.
* 参数：type,判断格式化后的金额是否需要小数位.
* 返回：返回格式化后的数值字符串.
*/
function formatMoney(s, type) {
if (/[^0-9\.]/.test(s)) return "0";
if (s == null || s == "") return "0";
s = s.toString().replace(/^(\d*)$/, "$1.");
s = (s + "00").replace(/(\d*\.\d\d)\d*/, "$1");
s = s.replace(".", ",");
var re = /(\d)(\d{3},)/;
while (re.test(s))
s = s.replace(re, "$1,$2");
s = s.replace(/,(\d\d)$/, ".$1");
if (type == 0) {// 不带小数位(默认是有小数位)
var a = s.split(".");
if (a[1] == "00") {
s = a[0];
}
}
return s;
}