JS

var common = {
    //简单的身份证判断
    isIDCard: function (val) {
        var pattern = /(^\d{15}$)|(^\d{17}([0-9]|X)$)/;
        return pattern.test(val);
    },
    //严格的身份证判断,很严格,错一位都不行,亲测有效
    isIdCardNo: function (num){
        var factorArr = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1);
        var parityBit = new Array("1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2");
        var varArray = new Array();
        var intValue;
        var lngProduct = 0;
        var intCheckDigit;
        var intStrLen = num.length;
        var idNumber = num;
        // initialize
        if ((intStrLen != 15) && (intStrLen != 18)) {
            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)) {
                return false;
            } else if (i < 17) {
                varArray[i] = varArray[i] * factorArr[i];
            }
        }
        if (intStrLen == 18) {
            //check date
            var date8 = idNumber.substring(6, 14);
            if (common.isDate8(date8) == false) {
                return false;
            }
            // calculate the sum of the products
            for (i = 0; i < 17; i++) {
                lngProduct = lngProduct + varArray[i];
            }
            // calculate the check digit
            intCheckDigit = parityBit[lngProduct % 11];
            // check last digit
            if (varArray[17] != intCheckDigit) {
                return false;
            }
        } else {//length is 15
            //check date
            var date6 = idNumber.substring(6, 12);
            if (common.isDate6(date6) == false) {
                return false;
            }
        }
        return true;
    },
    isDate6: function (sDate) {
        if (!/^[0-9]{6}$/.test(sDate)) {
            return false;
        }
        var year, month, day;
        year = sDate.substring(0, 4);
        month = sDate.substring(4, 6);
        if (year < 1700 || year > 2500) {
            return false;
        }
        if (month < 1 || month > 12) {
            return false;
        }
        return true;
    },
    isDate8: function (sDate) {
        if (!/^[0-9]{8}$/.test(sDate)) {
            return false;
        }
        var year, month, day;
        year = sDate.substring(0, 4);
        month = sDate.substring(4, 6);
        day = sDate.substring(6, 8);
        var iaMonthDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
        if (year < 1700 || year > 2500) {
            return false;
        }
        if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) {
            iaMonthDays[1] = 29;
        }
        if (month < 1 || month > 12) {
            return false;
        }
        if (day < 1 || day > iaMonthDays[month - 1]) {
            return false;
        }
        return true;
    }
}