身份证号码验证

function checkIDCard(id) {
    var idNum = id;
    //alert(idNum);
    var errors = new Array(
     "验证通过",
     "身份证号码位数不对",
      "身份证含有非法字符",
     "身份证号码校验错误",
     "身份证地区非法"
    );
    //身份号码位数及格式检验
    var re;
    var len = idNum.length;
    //身份证位数检验
    if (len != 15 && len != 18) {
        return errors[1];
    } else if (len == 15) {
        re = new RegExp(/^(\d{6})()?(\d{2})(\d{2})(\d{2})(\d{3})$/);
    } else {
        re = new RegExp(/^(\d{6})()?(\d{4})(\d{2})(\d{2})(\d{3})([0-9xX])$/);
    }

    var area = {
        11: "北京", 12: "天津", 13: "河北", 14: "山西",
        15: "内蒙古", 21: "辽宁", 22: "吉林", 23: "黑龙江", 31: "上海",
        32: "江苏", 33: "浙江", 34: "安徽", 35: "福建", 36: "江西",
        37: "山东", 41: "河南", 42: "湖北", 43: "湖南", 44: "广东",
        45: "广西", 46: "海南", 50: "重庆", 51: "四川", 52: "贵州",
        53: "云南", 54: "西藏", 61: "陕西", 62: "甘肃", 63: "青海",
        64: "宁夏", 65: "新疆", 71: "台湾", 81: "香港", 82: "澳门",
        91: "国外"
    }

    var idcard_array = new Array();
    idcard_array = idNum.split("");

    //地区检验
    if (area[parseInt(idNum.substr(0, 2))] == null) {
        return errors[4];
    }

    //出生日期正确性检验
    var a = idNum.match(re);

    if (a != null) {
        if (len == 15) {
            var DD = new Date("19" + a[3] + "/" + a[4] + "/" + a[5]);
            var flag = DD.getYear() == a[3] && (DD.getMonth() + 1) == a[4] && DD.getDate() == a[5];
        }
        else if (len == 18) {
            var DD = new Date(a[3] + "/" + a[4] + "/" + a[5]);
            var flag = DD.getFullYear() == a[3] && (DD.getMonth() + 1) == a[4] && DD.getDate() == a[5];
        }
        if (!flag) {
            //return false;
            return "身份证出生日期不对！";
        }
        //检验校验位
        if (len == 18) {
            S = (parseInt(idcard_array[0]) + parseInt(idcard_array[10])) * 7
               + (parseInt(idcard_array[1]) + parseInt(idcard_array[11])) * 9
               + (parseInt(idcard_array[2]) + parseInt(idcard_array[12])) * 10
               + (parseInt(idcard_array[3]) + parseInt(idcard_array[13])) * 5
               + (parseInt(idcard_array[4]) + parseInt(idcard_array[14])) * 8
               + (parseInt(idcard_array[5]) + parseInt(idcard_array[15])) * 4
               + (parseInt(idcard_array[6]) + parseInt(idcard_array[16])) * 2
               + parseInt(idcard_array[7]) * 1
               + parseInt(idcard_array[8]) * 6
               + parseInt(idcard_array[9]) * 3;

            Y = S % 11;
            M = "F";
            JYM = "10X98765432";
            M = JYM.substr(Y, 1); //判断校验位

            //检测ID的校验位
            if (M == idcard_array[17].toUpperCase()) {
                return true;
                //return "";
            }
            else {
                //return false;
                return errors[3];
            }
        }

    } else {
        //return false;
        return errors[2];
    }
    return true;
}