将数值四舍五入后格式化，带有千分位

来源：互联网发布：鸿业防排烟计算软件编辑：程序博客网时间：2024/05/22 05:12
<html><head></head><script>//保留几位小数function fmoney(obj, num) {return obj.value = formatNumber(obj.value, 2, 1);}/* 将数值四舍五入后格式化. @param num 数值(Number或者string) @param cent 要保留的小数位(Number) @param isThousand 是否需要千分位 0:不需要,1:需要(数值类型); @return 格式的字符串,如'1,234,567.45' @type String */ function formatNumber(num, cent, isThousand) {num = num.toString().replace(/\$|\,/g, '');if (isNaN(num))//检查传入数值为数值类型. num = "0";if (isNaN(cent))//确保传入小数位为数值型数值. cent = 0;cent = parseInt(cent);cent = Math.abs(cent);//求出小数位数,确保为正整数. if (isNaN(isThousand))//确保传入是否需要千分位为数值类型. isThousand = 0;isThousand = parseInt(isThousand);if (isThousand < 0)isThousand = 0;if (isThousand >= 1) //确保传入的数值只为0或1 isThousand = 1;sign = (num == (num = Math.abs(num)));//获取符号(正/负数) //Math.floor:返回小于等于其数值参数的最大整数 num = Math.floor(num * Math.pow(10, cent) + 0.50000000001);//把指定的小数位先转换成整数.多余的小数位四舍五入. cents = num % Math.pow(10, cent); //求出小数位数值. num = Math.floor(num / Math.pow(10, cent)).toString();//求出整数位数值. cents = cents.toString();//把小数位转换成字符串,以便求小数位长度. while (cents.length < cent) {//补足小数位到指定的位数. cents = "0" + cents;}if (isThousand == 0) //不需要千分位符. return (((sign) ? '' : '-') + num + '.' + cents);//对整数部分进行千分位格式化. for (var i = 0; i < Math.floor((num.length - (1 + i)) / 3); i++)num = num.substring(0, num.length - (4 * i + 3)) + ','+ num.substring(num.length - (4 * i + 3));return (((sign) ? '' : '-') + num + '.' + cents);}    </script><input onblur="fmoney(this,2);" value="" /><body></body></html>
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