//把千分位转换成数字 function commafyback(num) { var x = num.split(','); return parseFloat(x.join("")); } //加千分位 function comdify(n) { var re = /d{1,3}(?=(d{3})+$)/g; var n1 = n.replace(/^(d+)((.d+)?)$/, function (s, s1, s2) { return s1.replace(re, "$&,") + s2; }); return n1; }