JS格式化数字金额用逗号隔开保留两位小数

function fmoney(s, n) {
n = n > 0 && n <= 20 ? n : 2;
s = parseFloat((s + "").replace(/[^\d\.-]/g, "")).toFixed(n) + "";
var l = s.split(".")[0].split("").reverse(), r = s.split(".")[1];
t = "";
for (i = 0; i < l.length; i++) {
t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length ? "," : "");
}
return t.split("").reverse().join("") + "." + r;
}

function rmoney(s) {
return parseFloat(s.replace(/[^\d\.-]/g, ""));
}

<SCRIPT>
function fmoney(s, n) {
n = n > 0 && n <= 20 ? n : 2;
s = parseFloat((s + "").replace(/[^\d\.-]/g, "")).toFixed(n) + "";
var l = s.split(".")[0].split("").reverse(), r = s.split(".")[1];
t = "";
for (i = 0; i < l.length; i++) {
t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length ? "," : "");
}
return t.split("").reverse().join("") + "." + r;
}
function rmoney(s) {
return parseFloat(s.replace(/[^\d\.-]/g, ""));
}
function g(id) {
return document.getElementById(id);
}
window.onload = function() {
var num, txt = g("txt"), txt2 = g("txt2"), btn = g("btn"), btn2 = g("btn2"), span = g("span");
btn.onclick = function() {
num = parseInt(g("num").value);
txt.value = fmoney(txt.value, num);
txt2.value = fmoney(txt2.value, num);
};
btn2.onclick = function() {
num = parseInt(g("num").value);
span.innerHTML = "="
+ fmoney(rmoney(txt.value) + rmoney(txt2.value), num);
};
};
</SCRIPT>
小数点位数：
<select id="num">
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<input type="text" id="txt" value="12345.675910"> +
<input type="text" id="txt2" value="1223"> <span id="span"></span>
<br>
<input type="button" id="btn" value="格式化">
<input type="button" id="btn2" value="相加">

/*
* 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;
}
/*
* 通用DateAdd(interval,number,date) 功能:实现javascript的日期相加功能.
* 参数:interval,字符串表达式，表示要添加的时间间隔. 参数:number,数值表达式，表示要添加的时间间隔的个数. 参数:date,时间对象.
* 返回:新的时间对象. var now = new Date(); var newDate = DateAdd("day",5,now);
* author:devinhua(从○开始) update:2010-5-5 20:35
*/
function DateAdd(interval, number, date) {
if (date == null)
return "";
switch (interval) {
case "day":
date = new Date(date);
date = date.valueOf();
date += number * 24 * 60 * 60 * 1000;
date = new Date(date);
return date;
break;
default:
return "";
break;
}
}