Javascript金额转化

//"123,456.78"----> 123456.78(float格式)
function rmoney(s)
{
    return parseFloat(s.replace(/[^\d\.-]/g, ""));
} 

//参数说明：num 要格式化的数字 n 保留小数位
//formatNum(12345.675910, 2)，返回12,345.67
var formatNum = function(num,n) {
    num = String(num.toFixed(n));
    var re = /(-?\d+)(\d{3})/;
    while(re.test(num)) num = num.replace(re,"$1,$2")
    return num;
}