2. function IDCard(ID) {
    3.     var me = this;
    4.     this.checkCode = new Array(1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2);
    5.     this.ID;
    6.     this.errNum = 0;
    7.     this.err = {
    8.         1 : "身份证校验不符合求和模11=1这个等式",
    9.         2 : "身份证最后一位校验位有误",
    10.         3 : "身份证位数不正确",
    11.         4 : "年份错误",
    12.         5 : "月份错误",
    13.         6 : "日错误"
    14.     };
    15.     this.err_msg = function() {
    16.         return (0 !== this.errNum) ? this.err[this.errNum] : null;
    17.     };
    18.     this.check = function(ID) {
    19.         this.errNum = 0;
    20.         this.ID = ID;
    21.         if (cardValidate()) {
    22.             if (!aiCheck()) this.errNum = 1;
    23.             if (!LastByteCheck()) this.errNum = 2;
    24.             return (0 === this.errNum) ? true: false;
    25.         } else {
    26.             return false;
    27.         }
    28.     };
    29.     function getNum(str) {
    30.         var re = /^[0]*([0-9]*)$/;
    31.         str.match(re);
    32.         return parseInt(RegExp.$1,10);
    33.     }
    34.     //对身份证位数，出生日期，初步验证
    35.     function cardValidate() {
    36.         var re = /^[0-9x]{15,18}$/i;
    37.         if (!re.test(me.ID)) {
    38.             me.errNum = 7;
    39.             return false;
    40.         }
    41.         if (15 == me.ID.length || 18 == me.ID.length) {
    42.             var realLen = 0;
    43.             if (18 == me.ID.length) realLen = 2;
    44.             var year = parseInt(me.ID.substr(6, 2 + realLen),10);
    46.             //console.log(year, year.length)
    48.             var month = getNum(me.ID.substr(8 + realLen, 2));
    49.             var day = parseInt(me.ID.substr(10 + realLen, 2),10);
    50.             if (4 == (year+'').length) if (year < 1900 || year > 2050) me.errNum = 4;
    51.             if (month < 1 || month > 12) me.errNum = 5;
    52.             if (day < 1 || day > 31) me.errNum = 6;
    53.             return 0 === me.errNum;
    54.         } else {
    55.             me.errNum = 3;
    56.             return false;
    57.         }
    58.     }
    59.     //总和模11应该等于1
    60.     var aiCheck = function() {
    61.         var sum = 0;
    62.         for (var i = 1; i <= me.ID.length; i++) {
    63.             var ai = me.ID.substr(me.ID.length - i, 1);
    64.             ai = (ai.toLowerCase() == 'x') ? 10 : ai;
    65.             var wi = Math.pow(2, i - 1) % 11;
    66.             sum += parseInt(ai,10) * wi;
    67.         }
    68.         return 1 == sum % 11;
    69.     };
    70.     //最后一位校验，这个可以和aiCheck合在一起，减少一次循环
    71.     var LastByteCheck = function() {
    72.         var sum = 0;
    73.         for (var i = 2; i <= me.ID.length; i++) {
    74.             var ai = me.ID.substr(me.ID.length - i, 1);
    75.             ai = (ai.toLowerCase() == 'x') ? 10 : ai;
    76.             var wi = Math.pow(2, i - 1) % 11;
    77.             sum += parseInt(ai,10) * wi;
    78.         }
    79.         var checkCodeIndex = sum % 11;
    80.         var c = me.ID.substr(me.ID.length - 1, 1);
    81.         //alert(c+"=="+me.checkCode[checkCodeIndex]);
    82.         return c == me.checkCode[checkCodeIndex];
    83.     };
    84. }
    87. /*
    88. check(ID)验证身份证号码
    89. 返回值：0 : "是正确的身份证号"
    90.         1 : "身份证校验不符合求和模11=1这个等式",
    91.         2 : "身份证最后一位校验位有误",
    92.         3 : "身份证位数不正确",
    93.         4 : "年份错误",
    94.         5 : "月份错误",
    95.         6 : "日错误"
    97. */
    98. function check(ID) {
    99.     var arr = [
    100.         'ok',
    101.         "身份证校验不符合求和模11=1这个等式",
    102.         "身份证最后一位校验位有误",
    103.         "身份证位数不正确",
    104.         "年份错误",
    105.         "月份错误",
    106.         "日错误",
    107.         "格式错误"
    108.     ];
    109.     var ck = new IDCard();
    110.     ck.check(ID);
    111.     return  [ck.errNum, arr[ck.errNum] ];
    112. }
    115. var sfzh = '1234567890X';
    116. console.log(check(sfzh))