verifyIdCard static method

String verifyIdCard(String idCard)

校验身份证合法性

Implementation

static String verifyIdCard(String idCard) {
  const Map city = {
    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 "
  };
  bool pass = true;

  RegExp cardReg = RegExp(r'^\d{6}(18|19|20)?\d{2}(0[1-9]|1[012])(0[1-9]|[12]\d|3[01])\d{3}(\d|X)$');
  if (idCard.isEmpty || !cardReg.hasMatch(idCard)) {
    pass = false;
    return "身份证号格式错误";
  }
  if (city[int.parse(idCard.substring(0, 2))] == null) {
    pass = false;
    return "地址编码错误";
  }

  /// 18位身份证需要验证最后一位校验位，15位不检测了，现在也没15位的了
  if (idCard.length == 18) {
    List numList = idCard.split('');

    /// ∑(ai×Wi)(mod 11)
    /// 加权因子
    List factor = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];

    /// 校验位
    List parity = [1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2];
    int sum = 0;
    int ai = 0;
    int wi = 0;
    for (var i = 0; i < 17; i++) {
      ai = int.parse(numList[i]);
      wi = factor[i];
      sum += ai * wi;
    }
    var last = parity[sum % 11];
    if (parity[sum % 11].toString() != numList[17]) {
      pass = false;
      return "校验位错误";
    }
  } else {
    pass = false;
    return "身份证号不是18位";
  }
  return "";
}