<script type="text/javascript"> //--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; }function checkDate(date) {     return true; }  function check(){ idnum = document.getElementById(‘idcard‘).value; alert(isIdCardNo(idnum));  }</script>