找 Kobo 上面最便宜的國家

find_kobo_lowest_price.js

/**
 * 1. Get current rates from https://www.xe.com/api/protected/midmarket-converter/
 * 2. Replace "rates" object with the correct currency rates.
 * 3. Select a book on Kobo.
 * 4. Click the country flag at the top right corner.
 * 5. Execute this script.
 */

rates = {
  ADA: 3.8456167243,
  AED: 3.6725,
  AFN: 88.4769615132,
  ALL: 107.5801371358,
  AMD: 391.7775173811,
  ANG: 1.7899896574,
  AOA: 510.0081478307,
  ARS: 174.8236563613,
  ATS: 12.9593695667,
  AUD: 1.4902714495,
  AWG: 1.79,
  AZM: 8499.6974068942,
  AZN: 1.6999394814,
  BAM: 1.8419891848,
  BBD: 2,
  BCH: 0.0097832721,
  BDT: 106.3582698746,
  BEF: 37.9918804375,
  BGN: 1.8419891848,
  BHD: 0.376,
  BIF: 2062.6433832318,
  BMD: 1,
  BND: 1.3504175257,
  BOB: 6.9072139218,
  BRL: 5.163976781,
  BSD: 1,
  BTC: 0.0000593622,
  BTN: 82.8223696346,
  BWP: 12.9525551151,
  BYN: 2.5047511507,
  BYR: 25047.5115072178,
  BZD: 2.0147192473,
  CAD: 1.3603732307,
  CDF: 2034.326291625,
  CHF: 0.9333058987,
  CLF: 0.0380809882,
  CLP: 878.0332064486,
  CNH: 7.0038881072,
  CNY: 6.9917791547,
  COP: 4734.826911074,
  CRC: 582.6955705799,
  CUC: 1,
  CUP: 23.9972434316,
  CVE: 103.8516371098,
  CYP: 0.5512076091,
  CZK: 22.791026954,
  DEM: 1.8419891848,
  DJF: 177.7684480485,
  DKK: 7.0029442293,
  DOGE: 12.928637459,
  DOP: 55.7895980973,
  DOT: 0.222617892,
  DZD: 137.5875230166,
  EEK: 14.7359134784,
  EGP: 24.7491820466,
  ERN: 15,
  ESP: 156.701355692,
  ETB: 53.597990201,
  ETH: 0.0008198803,
  EUR: 0.9417941154,
  FIM: 5.599653526,
  FJD: 2.2318419754,
  FKP: 0.8306037044,
  FRF: 6.1777644258,
  GBP: 0.8306037044,
  GEL: 2.6896342286,
  GGP: 0.8306037044,
  GHC: 92764.4335765763,
  GHS: 9.2764433577,
  GIP: 0.8306037044,
  GMD: 61.8915758688,
  GNF: 8629.1046692298,
  GRD: 320.9163448369,
  GTQ: 7.8565505774,
  GYD: 208.8325878494,
  HKD: 7.8046987022,
  HNL: 24.6729025109,
  HRK: 7.1005729862,
  HTG: 146.0935962995,
  HUF: 376.5475808232,
  IDR: 15589.6419726558,
  IEP: 0.7417231407,
  ILS: 3.5020674043,
  IMP: 0.8306037044,
  INR: 82.8223696346,
  IQD: 1459.1574318561,
  IRR: 41636.5702676274,
  ISK: 143.4381949011,
  ITL: 1823.5676919073,
  JEP: 0.8306037044,
  JMD: 152.6791075809,
  JOD: 0.709,
  JPY: 132.8874400049,
  KES: 123.2909596426,
  KGS: 85.678596494,
  KHR: 4112.6783683926,
  KMF: 463.3323319373,
  KPW: 899.9099168824,
  KRW: 1281.0673893522,
  KWD: 0.3064827815,
  KYD: 0.8199870236,
  KZT: 461.7102073563,
  LAK: 17272.5011774459,
  LBP: 1507.5,
  LINK: 0.1671262295,
  LKR: 365.488306107,
  LRD: 154.3696471598,
  LSL: 17.0141068708,
  LTC: 0.015237124,
  LTL: 3.2518267218,
  LUF: 37.9918804375,
  LUNA: 7.13128503703983e40,
  LVL: 0.6618929043,
  LYD: 4.8207639054,
  MAD: 10.5018197051,
  MDL: 19.2773995083,
  MGA: 4443.5397349128,
  MGF: 22217.6986745641,
  MKD: 57.998330228,
  MMK: 2099.8282797932,
  MNT: 3433.8362874812,
  MOP: 8.0388396633,
  MRO: 372.1456194658,
  MRU: 37.2145619466,
  MTL: 0.4043122138,
  MUR: 44.2117526658,
  MVR: 15.4107183181,
  MWK: 1028.0352244005,
  MXN: 19.3967479775,
  MXV: 2.758460685,
  MYR: 4.4246984602,
  MZM: 64042.8989959457,
  MZN: 64.0428989959,
  NAD: 17.0141068708,
  NGN: 446.0888231722,
  NIO: 36.4137863467,
  NLG: 2.0754411101,
  NOK: 9.8663703534,
  NPR: 132.5779081926,
  NZD: 1.5903853002,
  OMR: 0.3849538615,
  PAB: 1,
  PEN: 3.8165000182,
  PGK: 3.5210923462,
  PHP: 55.2341808334,
  PKR: 226.3691539969,
  PLN: 4.3714187244,
  PTE: 188.8127678521,
  PYG: 7296.2181201286,
  QAR: 3.64,
  ROL: 46244.3001887193,
  RON: 4.6244300189,
  RSD: 110.4652966219,
  RUB: 68.7950965919,
  RWF: 1067.8394000382,
  SAR: 3.75,
  SBD: 8.2573420562,
  SCR: 14.2249470298,
  SDD: 57235.533221287,
  SDG: 572.3553322129,
  SEK: 10.5197650693,
  SGD: 1.3504175257,
  SHP: 0.8306037044,
  SIT: 225.6915418246,
  SKK: 28.3724895218,
  SLE: 18.8642875357,
  SLL: 18864.2875356555,
  SOS: 569.1151057231,
  SPL: 0.166666666,
  SRD: 31.5530918221,
  SRG: 31553.0918221314,
  STD: 23099.67002775,
  STN: 23.0996700278,
  SVC: 8.75,
  SYP: 2512.4276806864,
  SZL: 17.0141068708,
  THB: 34.7626392404,
  TJS: 10.2025056681,
  TMM: 17468.3271860555,
  TMT: 3.4936654372,
  TND: 3.1156579743,
  TOP: 2.3600484299,
  TRL: 18683615.126171418,
  TRY: 18.6836151262,
  TTD: 6.7871310728,
  TVD: 1.4902714495,
  TWD: 30.7574728705,
  TZS: 2333.9631932529,
  UAH: 36.8747555515,
  UGX: 3637.4756211684,
  UNI: 19.0375055386,
  USD: 1,
  UYU: 38.604508423,
  UZS: 11225.5993750431,
  VAL: 1823.5676919073,
  VEB: 1641540077.0165398,
  VED: 16.4154007702,
  VEF: 1641540.0770165399,
  VES: 16.4154007702,
  VND: 23526.8727306767,
  VUV: 119.3643230661,
  WST: 2.7275952107,
  XAF: 617.7764425831,
  XAG: 0.0421805017,
  XAU: 0.0005569,
  XBT: 0.0000593622,
  XCD: 2.6999138387,
  XDR: 0.7514053202,
  XLM: 13.174815167,
  XOF: 617.7764425831,
  XPD: 0.0005851886,
  XPF: 112.3859326299,
  XPT: 0.0010011189,
  XRP: 2.8465365428,
  YER: 250.1564306194,
  ZAR: 17.0141068708,
  ZMK: 18005.8477021466,
  ZMW: 18.0058477021,
  ZWD: 361.9,
  ZWL: 671.810102792,
};

my_read_page = async (url, index) => {
  let response = await fetch(url, {});

  let elm = document.createElement("html");

  elm.innerHTML = await response.text();
  let price = elm.querySelector('[property="og:price"]').content;
  let current = elm.querySelector('[property="og:currency_code"]').content;
  console.log(`${index} ${url} ${price}${current}`);
  return {
    price,
    current,
    url,
  };
};

(async () => {
  let urls = Array.from(document.querySelectorAll("a.country")).map(
    (el) => el.href
  );
  let results = await Promise.allSettled(
    urls.map((u, i) => my_read_page(u, i))
  );
  results = results.map((r) => r.value);
  results.sort((a, b) => {
    let to_ntd = (c) =>
      (Number(c.price.replace(",", ".")) / rates[c.current]) * rates.TWD;
    a.ntd = to_ntd(a);
    b.ntd = to_ntd(b);
    return a.ntd - b.ntd;
  });
  console.log(results.map((r) => `${r.ntd} ${r.url}`));
})();