JS 数字格式千分位相互转换

/**



 * 数字格式转换成千分位



 *@param{Object}num



 */



function commafy(num){



   if((num+"").Trim()==""){



      return"";



   }



   if(isNaN(num)){



      return"";



   }



   num = num+"";



   if(/^.*\..*$/.test(num)){



      varpointIndex =num.lastIndexOf(".");



      varintPart = num.substring(0,pointIndex);



      varpointPart =num.substring(pointIndex+1,num.length);



      intPart = intPart +"";



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



       while(re.test(intPart)){



          intPart =intPart.replace(re,"$1,$2")



       }



      num = intPart+"."+pointPart;



   }else{



      num = num +"";



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



       while(re.test(num)){



          num =num.replace(re,"$1,$2")



       }



   }



    return num;



}





/**



 * 去除千分位



 *@param{Object}num



 */







function delcommafy(num){



   if((num+"").Trim()==""){



      return"";



   }



   num=num.replace(/,/gi,'');



   returnnum;



}