JAvascript身分証明書番号検証

/***      
    @param {String} personnumber      
    @example: checkIdcard(pass);  //return true | false;
*/
console.log(checkIdcard('    ')); //        ture / false 
function checkIdcard(personnumber) {
     
    personnumber = personnumber.toUpperCase();
    //      15   18 ，15      ，18  17    ，        ，        X。
    if (!(/(^\d{15}$)|(^\d{17}([0-9]|X)$)/.test(personnumber))) {
     
        return false;
    }
    //     ISO 7064:1983.MOD 11-2     ，X       10。
    //              
    var len, re;
    len = personnumber.length;
    if (len == 15) {
     
        re = new RegExp(/^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/);
        var arrSplit = personnumber.match(re);

        //          
        var dtmBirth = new Date('19' + arrSplit[2] + '/' + arrSplit[3] + '/' + arrSplit[4]);
        var bGoodDay;
        bGoodDay = (dtmBirth.getFullYear() == Number(arrSplit[2])) && ((dtmBirth.getMonth() + 1) == Number(arrSplit[3])) && (dtmBirth.getDate() == Number(arrSplit[4]));
        if (!bGoodDay) {
     
            return false;
        }
        else {
     
            // 15      18 
            //     ISO 7064:1983.MOD 11-2     ，X       10。
            var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
            var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');
            var nTemp = 0, i;
            personnumber = personnumber.substr(0, 6) + '19' + personnumber.substr(6, personnumber.length - 6);
            for (i = 0; i < 17; i++) {
     
                nTemp += personnumber.substr(i, 1) * arrInt[i];
            }
            personnumber += arrCh[nTemp % 11];
            return true;
        }
    }
    if (len == 18) {
     
        re = new RegExp(/^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/);
        var arrSplit = personnumber.match(re);

        //          
        var dtmBirth = new Date(arrSplit[2] + "/" + arrSplit[3] + "/" + arrSplit[4]);
        var bGoodDay;
        bGoodDay = (dtmBirth.getFullYear() == Number(arrSplit[2])) && ((dtmBirth.getMonth() + 1) == Number(arrSplit[3])) && (dtmBirth.getDate() == Number(arrSplit[4]));
        if (!bGoodDay) {
     
            return false;
        } else {
     
            //  18            。
            //     ISO 7064:1983.MOD 11-2     ，X       10。
            var valnum;
            var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
            var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');
            var nTemp = 0, i;
            for (i = 0; i < 17; i++) {
     
                nTemp += personnumber.substr(i, 1) * arrInt[i];
            }
            valnum = arrCh[nTemp % 11];
            if (valnum != personnumber.substr(17, 1)) {
     
                return false;
            }
            return true;
        }
    }
    return false;
}