js格式化数字 金额按千位逗号分隔

 // 返回数字
 function removeFormatMoney(s) {
     return parseFloat(s.replace(/[^\d\.-]/g, ""));
 }

 /*
  * formatMoney(s,type)
  * 功能：金额按千位逗号分隔
  * 参数：s，需要格式化的金额数值.
  * 参数：type,判断格式化后的金额是否需要小数位.
  * 返回：返回格式化后的数值字符串.
  */
 function formatMoney(s, type) {
     if (/[^0-9\.]/.test(s))
         return "0.00";
     if (s == null || s == "null" || s == "")
         return "0.00";
     s = s.toString().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");
     if (type == 0) {
         var a = s.split(".");
         if (a[1] == "00") {
             s = a[0];
         }
     }
     return s;
 }

转载：http://blog.csdn.net/evangel_z/article/details/12839657