[vscode feedback] 统一社会信用代码

[yujiyuan]

统一社会信用代码 /^[0-9A-HJ-NPQRTUWXY]{2}\d{6}[0-9A-HJ-NPQRTUWXY]{10}$/.test(111111111111111111)返回true。111111111111111111不是一个正确的统一社会信用代码

[Annunx]

这个你应该用统一社会信用代码规则计算，而不是通过正则，正则只能保证格式正确，不能保证计算规则正确。

// 校验统一社会信用代码
function validateUSCCode(code) {
  const regex = /^[0-9A-HJ-NPQRTUWXY]{2}\d{6}[0-9A-HJ-NPQRTUWXY]{10}$/;

  if (!code || code.length !== 18 || !regex.test(code)) {
    return false;
  }

  // 权重因子
  const weightFactors = [
    1, 3, 9, 27, 19, 26, 16, 17, 20, 29, 25, 13, 8, 24, 10, 30, 28,
  ];
  // 字符映射
  const charToNumMap = {
    0: 0,
    1: 1,
    2: 2,
    3: 3,
    4: 4,
    5: 5,
    6: 6,
    7: 7,
    8: 8,
    9: 9,
    A: 10,
    B: 11,
    C: 12,
    D: 13,
    E: 14,
    F: 15,
    G: 16,
    H: 17,
    J: 18,
    K: 19,
    L: 20,
    M: 21,
    N: 22,
    P: 23,
    Q: 24,
    R: 25,
    T: 26,
    U: 27,
    W: 28,
    X: 29,
    Y: 30,
  };

  // 计算加权求和
  let weightedSum = 0;
  for (let i = 0; i < 17; i++) {
    const char = code.charAt(i);
    const num = charToNumMap[char];
    if (num === undefined) {
      return false; // 非法字符
    }
    weightedSum += num * weightFactors[i];
  }

  // 获取校验码索引
  const checkCodeIndex = (31 - (weightedSum % 31)) % 31;
  // 获取校验码
  let expectedCheckCode = "";
  for (var key in charToNumMap) {
    if (charToNumMap[key] === checkCodeIndex) {
      expectedCheckCode = key;
      break;
    }
  }
  // 比对校验码
  return code.charAt(17) === expectedCheckCode;
}

// 示例调用
console.log(validateUSCCode("91110000802100433B")); // true
console.log(validateUSCCode("111111111111111111")); // false