js实现千位分隔符 保留两位小数

function method2() {//添加千位符var s = "1531531.351";if (/[^0-9\.]/.test(s)) {return "invalid value";}s = s.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");alert(s.replace(/^\./, "0."));}