数字千分位处理

function transformAmount(s) {//千分位显示  
         s=parseFloat(s);//去除首位输入的0，如002，小数不影响parseFloat字符串转数字  
          
            s=s.toString();  
            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");  
            return s.replace(/^\./, "0.");  
               
}