计算价格
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/485233/1547690/getPrice.js
const defaultRate = 7.1;
const defaultShippingCost = 85;
function getPrice(cost, weight) {
let proRate = 0.25;
if (cost <= 250 && cost > 50) {
proRate = 0.22;
}
const rate = getRate() * 0.944 * 0.99;
const shippingCost = +getShippingCost();
const price = ((cost + weight * shippingCost) / (1 - proRate)) / rate;
return Math.ceil(price);
}