id-num gen

id-card.js

var factors = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2]
var tails = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2']
var provinceMap = {
  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 provinces = Object.keys(provinceMap)
var monthDays = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

function rand(min, max) {
  if (max === undefined) {
    max = min
    min = 0
  }
  return Math.floor(Math.random() * (max - min)) + min
}

function pad(n) {
  if (n < 10) {
    return '0' + n.toString(10)
  }
  return n.toString(10)
}

function gen() {
    var ret = ''
    // 省
    ret += provinces[rand(provinces.length)]
    // 地
    ret += pad(rand(30))
    // 市
    ret += pad(rand(30))
    // 年
    var year1 = rand(19, 20)
    ret += pad(year1)
    var year2 = year1 === 19 ? rand(40, 100) : rand(0, 16)
    ret += pad(year2)
    // 月
    var month = rand(1, 13)
    ret += pad(month)
    // 闰年就无视了
    var day = rand(monthDays[month])
    ret += pad(day)
    // 最后
    for (var i = 0; i < 3; ++i) {
        var digit = rand(10).toString(10)
        ret += digit
    }
    return ret
}


var num = process.argv[2]
if (!num || num.length !== 17) {
    // console.log('node id-card.js xxxxxxxxxxxxxxxxx (17 digits)')
    // return

    num = gen()
}
console.log('input:', num + '*')

var checksum = num.split('')
    .map(s => parseInt(s, 10))
    .reduce((sum, cur, i) => sum + cur * factors[i], 0)
console.log('checksum:', checksum);

var mod = checksum % 11
var tail = tails[mod]
console.log('mod:', mod)
console.log('tail:', tail)

console.log('[Result]')
console.log(num + tail)