function outputmoney(number) {
	if (isNaN(number) || number == "") return "";
	number = Math.round(number * 100) / 100;
	if (number < 0)
		return '-' + outputdollars(Math.floor(Math.abs(number) - 0) + '') + outputcents(Math.abs(number) - 0);
	else
		return outputdollars(Math.floor(number - 0) + '') + outputcents(number - 0);
}
//格式化金額 
function outputdollars(number) {
	if (number.length <= 3)
		return (number == '' ? '0' : number);
	else {
		var mod = number.length % 3;
		var output = (mod == 0 ? '' : (number.substring(0, mod)));
		for (i = 0; i < Math.floor(number.length / 3); i++) {
			if ((mod == 0) && (i == 0))
				output += number.substring(mod + 3 * i, mod + 3 * i + 3);
			else
				output += ',' + number.substring(mod + 3 * i, mod + 3 * i + 3);
		}
		return (output);
	}
}


function outputcents(amount) {
	amount = Math.round(((amount) - Math.floor(amount)) * 100);
	return (amount < 10 ? '.0' + amount : '.' + amount);
}
 

使用：outputmoney("12313123000");

2.例如： 
12345格式化為12,345.00 
12345.6格式化為12,345.60 
12345.67格式化為 12,345.67 
只留兩位小數

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;
}
 

呼叫：fmoney("12345.675910", 3)，返回12,345.676 

3 最簡單

var s = '12345237987584564656,000.00';
var d=s.replace(/(\d)(?=(\d{3})+(?!\d))/g, "$1,")

alert(d)

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