fetch keepalive 可靠小请求上报实践

`title: fetch keepalive 可靠小请求上报实践``categories: Web 开发/前端/数据管理``keywords: fetch,keepalive,上报,可靠,日志``description: 使用 fetch 的 keepalive 选项在页面卸载时可靠发送小请求用于日志或统计，结合回退与队列提升稳定性。`示例async function sendKeepalive(url, data) { const res = await fetch(url, { method: 'POST', body: JSON.stringify(data), headers: { 'Content-Type': 'application/json' }, keepalive: true }); return res.ok; }