速率限制与配额

async function fetchWithRetry(url, options, maxRetries = 3) {
  for (let i = 0; i < maxRetries; i++) {
    const response = await fetch(url, options);
    if (response.status === 429) {
      const delay = Math.pow(2, i) * 1000; // 1s, 2s, 4s
      await new Promise(r => setTimeout(r, delay));
      continue;
    }
    return response;
  }
  throw new Error('请求超出重试次数');
}