js身份證號格式校驗

/***校驗身份證號
@param {String} personnumber 身份證號碼
@example: checkIdcard(pass); //return true | false;
*/

function checkIdcard(personnumber) {
    personnumber = personnumber.toUpperCase();
    //身份證號碼爲15位或者18位，15位時全爲數字，18位前17位爲數字，最後一位是校驗位，可能爲數字或字符X。
    if (!(/(^\d{15}$)|(^\d{17}([0-9]|X)$)/.test(personnumber))) {
        return false;
    }
    //校驗位按照ISO 7064:1983.MOD 11-2的規定生成，X能夠認爲是數字10。
    //下面分別分析出生日期和校驗位
    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);

        //檢查生日日期是否正確
        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 {
            //將15位身份證轉成18位
            //校驗位按照ISO 7064:1983.MOD 11-2的規定生成，X能夠認爲是數字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);

        //檢查生日日期是否正確
        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 {
            //檢驗18位身份證的校驗碼是否正確。
            //校驗位按照ISO 7064:1983.MOD 11-2的規定生成，X能夠認爲是數字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;
}