(转)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;

}