Display Steam Market item price in CNY with dynamic exchange rate update interval
// ==UserScript==
// @name Steam CNY价格转换（商品界面）
// @namespace https://greasyfork.org/zh-CN/users/963647-moase
// @version 0.5
// @description Display Steam Market item price in CNY with dynamic exchange rate update interval
// @author MaoShiSanKe
// @match https://steamcommunity.com/market/listings/*
// @grant GM_xmlhttpRequest
// @license MIT
// ==/UserScript==
(function() {
'use strict';
const exchangeRateAPI = 'https://api.exchangerate-api.com/v4/latest/USD';
const CACHE_EXPIRY_TIME = 30 * 60 * 1000; // 缓存过期时间：30分钟
let lastExchangeRate = null;
let lastExchangeRateTime = 0;
let lastDataUpdateTime = 0;
let isProcessing = false; // 防止多次执行
let isRateUpdating = false; // 防止频繁的汇率请求
let officialRefreshInterval = 5000; // 默认5秒
// 获取商品价格
const getItemPrices = () => {
let prices = [];
document.querySelectorAll('.market_commodity_orders_table td').forEach((cell, index) => {
if (index % 2 === 0) {
const priceText = cell.textContent.trim();
if (priceText.startsWith('$')) {
prices.push(parseFloat(priceText.substring(1)));
}
}
});
return prices;
};
// 获取汇率并缓存
const getExchangeRate = () => {
const currentTime = Date.now();
// 如果缓存未过期，直接返回缓存的汇率
if (lastExchangeRate && currentTime - lastExchangeRateTime < CACHE_EXPIRY_TIME) {
return Promise.resolve(lastExchangeRate);
}
// 如果缓存过期，则重新请求API
return new Promise((resolve, reject) => {
GM_xmlhttpRequest({
method: 'GET',
url: exchangeRateAPI,
onload: (response) => {
try {
const data = JSON.parse(response.responseText);
if (data.rates && data.rates.CNY) {
// 缓存汇率并设置时间戳
lastExchangeRate = data.rates.CNY;
lastExchangeRateTime = currentTime;
resolve(lastExchangeRate);
} else {
reject('CNY汇率未找到');
}
} catch (e) {
reject('解析汇率数据失败');
}
},
onerror: (error) => {
reject('请求失败: ' + error);
}
});
});
};
// 显示转换后的价格
const displayPricesInCNY = async () => {
if (isProcessing) return; // 防止重复处理
isProcessing = true;
const prices = getItemPrices();
if (prices.length > 0) {
try {
const exchangeRate = await getExchangeRate();
prices.forEach(price => {
const priceInCNY = (price * exchangeRate).toFixed(2);
const priceElement = document.createElement('span');
priceElement.textContent = `(￥\ ${priceInCNY} CNY)`;
priceElement.classList.add('cny-price');
const priceNode = Array.from(document.querySelectorAll('.market_commodity_orders_table td')).find(node => node.textContent.includes(`$${price.toFixed(2)}`));
if (priceNode && !priceNode.querySelector('.cny-price')) {
priceNode.appendChild(priceElement);
}
});
} catch (error) {
console.error('获取汇率失败:', error);
}
}
isProcessing = false;
};
// 捕获官方刷新间隔（如果可以的话）
const captureRefreshInterval = () => {
const refreshTimeNode = document.querySelector('.market_commodity_orders_table');
if (refreshTimeNode) {
// 检测到页面内数据更新的时间间隔
const refreshInterval = window.getComputedStyle(refreshTimeNode).getPropertyValue('animation-duration');
if (refreshInterval) {
const seconds = parseFloat(refreshInterval) * 1000; // 将秒转为毫秒
officialRefreshInterval = seconds;
console.log(`检测到官方刷新间隔: ${officialRefreshInterval / 1000} 秒`);
}
}
};
// 检测数据是否刷新并更新汇率
const checkForDataUpdate = () => {
const currentTime = Date.now();
// 如果数据已经刷新，并且距离上次汇率更新超过刷新间隔，则更新汇率
if (currentTime - lastDataUpdateTime >= officialRefreshInterval && !isRateUpdating) {
isRateUpdating = true;
lastDataUpdateTime = currentTime;
displayPricesInCNY().finally(() => {
isRateUpdating = false;
});
}
};
// 使用 MutationObserver 监听价格更新
const observePriceChanges = () => {
const targetNode = document.querySelector('.market_commodity_orders_table');
if (targetNode) {
const observer = new MutationObserver(() => {
checkForDataUpdate(); // 检查数据更新时间
});
observer.observe(targetNode, { childList: true, subtree: true });
}
};
// 处理页面加载
window.addEventListener('load', () => {
captureRefreshInterval(); // 捕获官方刷新间隔
displayPricesInCNY();
observePriceChanges();
// 定时检查数据更新时间并更新汇率
setInterval(checkForDataUpdate, officialRefreshInterval);
});
})();