js千分位处理

    function addKannma(number) {  
var num = number + "";  
         num = num.replace(new RegExp(",","g"),"");   
// 正负号处理   
         var symble = "";   
if(/^([-+]).*$/.test(num)) {   
             symble = num.replace(/^([-+]).*$/,"$1");   
             num = num.replace(/^([-+])(.*)$/,"$2");   
         }   

if(/^[0-9]+(\.[0-9]+)?$/.test(num)) {   
var num = num.replace(new RegExp("^[0]+","g"),"");   
if(/^\./.test(num)) {   
             num = "0" + num;   
             }   

var decimal = num.replace(/^[0-9]+(\.[0-9]+)?$/,"$1");   
var integer= num.replace(/^([0-9]+)(\.[0-9]+)?$/,"$1");   

var re=/(\d+)(\d{3})/;  

while(re.test(integer)){   
                 integer = integer.replace(re,"$1,$2");  
             }   
return symble + integer + decimal;   

         } else {   
return number;   
         }   
     }