JD_book_voucher

京东图书促销满减价格凑额度工具。
Wrap lines
// ==UserScript==
// @name         JD_book_voucher
// @namespace    niu541412
// @version      1.0
// @description  京东图书促销满减价格凑额度工具。
// @author       niu541412
// @match        *://cart.jd.com/*
// @grant        none
// @icon         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
// @author       [email protected]
// @license      MIT License
// @run-at       document-end
// ==/UserScript==

function jd_book(PromoName, ExpectedSum, Tolerance) {
  var promo = document.getElementById(PromoName);
  var list = promo.getElementsByClassName("plus-switch");
  var stock = promo.getElementsByClassName("ftx-03 ac");
  var NoStock = 0;
  var price = new Array(list.length);
  var book = new Array(list.length);
  for (var i = 0; i < list.length; i++) {
    if (stock[i].textContent == "无货") {
      NoStock++;
      continue;
    }
    price[i - NoStock] = parseFloat(list[i].textContent.match(/\d+\.\d+/g));
    book[i - NoStock] = promo.getElementsByClassName("p-name")[i].innerText;
  }
  price = price.splice(0, list.length - NoStock);
  book = book.splice(0, list.length - NoStock);
  var NotEND = 1;
  var n = 10 * 2 ** price.length;

  var pool = price;
  var backup = new Array(list.length);
  backup.fill(0);

  var sum = (accumulator, currentValue) => accumulator + currentValue; //数组求和
  price.reduce(sum);

  while (NotEND && n) {
    n--;
    var t = pool.reduce(sum);
    t = Math.round(t * 100) / 100.00;
    if (t > ExpectedSum + Tolerance || t < ExpectedSum - Tolerance) {
      i = Math.floor(Math.random() * price.length);
      var temp1 = pool[i];
      var temp2 = backup[i];
      pool[i] = temp2;
      backup[i] = temp1;
    } else {
      NotEND = 0;
    }
  };

  if (n == 0) {
    console.log("组合失败!\n");
  } else {
    var j = 0;
    for (i = 0; i < pool.length; i++) {
      if (pool[i] > 0) {
        console.log(pool[i] + "元:" + book[i]);
        j++;
      }
    }
    console.log("总共" + j + "本书：" + t + "元。\n");
  }
}

var script = document.createElement('script');
script.appendChild(document.createTextNode(jd_book));
(document.body || document.head || document.documentElement).appendChild(script);