正则|js 实现逗号分隔，即每隔三位一个间隔 js|工具库|JavaScript

1，toLocaleString();
var a = 8462948.24;
a.toLocaleString();
2,正则封装成方法
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function formatNum(strNum){ var outputmoney = function (number) { number = number.replace(/\,/g, ""); //把所有的逗号，清除 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); } //格式化金额 var outputdollars = function (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); } } var outputcents = function (amount) { amount = Math.round(((amount) - Math.floor(amount)) * 100); return (amount < 10 ? '.0' + amount : '.' + amount); } return outputmoney(strNum + ""); }

【正则|js 实现逗号分隔，即每隔三位一个间隔】