JS实现数字格式千分位相互转换方法

/** * 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;}