 
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; 
} 

調用：fmoney("12345.675910", 3)，返回12,345.676
還原函數(shù)：

復制代碼代碼如下:

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

示例（可保存一下代碼為html文件，運行查看效果）：

復制代碼代碼如下:

 
<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> 
小數(shù)點位數(shù)： 
<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"> 

附：

復制代碼代碼如下:

 
/* 
* formatMoney(s,type) 
* 功能：金額按千位逗號分割 
* 參數(shù)：s，需要格式化的金額數(shù)值. 
* 參數(shù)：type,判斷格式化后的金額是否需要小數(shù)位. 
* 返回：返回格式化后的數(shù)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) {// 不帶小數(shù)位(默認是有小數(shù)位) 
var a = s.split("."); 
if (a[1] == "00") { 
s = a[0]; 
} 
} 
return s; 
} 
/* 
* 通用DateAdd(interval,number,date) 功能:實現(xiàn)javascript的日期相加功能. 
* 參數(shù):interval,字符串表達式，表示要添加的時間間隔. 參數(shù):number,數(shù)值表達式，表示要添加的時間間隔的個數(shù). 參數(shù):date,時間對象. 
* 返回:新的時間對象. var now = new Date(); var newDate = DateAdd("day",5,now); 
* author:devinhua(從○開始) 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; 
} 
} 