身份证号码验证-支持新的带x身份证

//--身份证号码验证-支持新的带x身份证
 function isIdCardNo(num)
 {
     var factorArr = new Array(7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2,1);
     var error;
     var varArray = new Array();
     var intValue;
     var lngProduct = 0;
     var intCheckDigit;
     var intStrLen = num.length;
     var idNumber = num;
     // initialize
     if ((intStrLen != 15) && (intStrLen != 18)) {
         //error = "输入身份证号码长度不对！";
         //alert(error);
         //frmAddUser.txtIDCard.focus();
         return false;
     }
     // check and set value
     for(i=0;i<intStrLen;i++) {
         varArray[i] = idNumber.charAt(i);
         if ((varArray[i] < '0' || varArray[i] > '9') && (i != 17)) {
             //error = "错误的身份证号码！.";
             //alert(error);
             //frmAddUser.txtIDCard.focus();
             return false;
        } else if (i < 17) {
            varArray[i] = varArray[i]*factorArr[i];
         }
     }
    if (intStrLen == 18) {
        //check date
         var date8 = idNumber.substring(6,14);
         if (checkDate(date8) == false) {
             //error = "身份证中日期信息不正确！.";
             //alert(error);
             return false;
         }
         // calculate the sum of the products
         for(i=0;i<17;i++) {
             lngProduct = lngProduct + varArray[i];
     }
         // calculate the check digit
         intCheckDigit = 12 - lngProduct % 11;
         switch (intCheckDigit) {
             case 10:
                 intCheckDigit = 'X';

              break;
            case 11:
                 intCheckDigit = 0;
                 break;
             case 12:
                intCheckDigit = 1;
                 break;
         }
         // check last digit
         if (varArray[17].toUpperCase() != intCheckDigit) {
             //error = "身份证效验位错误!正确为： " + intCheckDigit + ".";
             //alert(error);
             return false;
        }
     }
     else{        //length is 15
        //check date
         var date6 = idNumber.substring(6,12);
         if (checkDate(date6) == false) {
             //alert("身份证日期信息有误！.");
             return false;
         }
}
//alert ("Correct.");
     return true;
 }