Performance API 持久化策略的性能评估与监测

`title: Performance API 持久化策略的性能评估与监测``categories: Web 开发/前端/数据管理``keywords: Performance API,Resource Timing,Navigation Timing,Long Tasks,监测``description: 使用 Performance API 评估缓存与持久化策略的效果，采集关键指标并结合长任务监测优化前端数据管理。`采集示例function getResourceMetrics() { return performance.getEntriesByType('resource').map(e => ({ name: e.name, ttfb: e.responseStart - e.startTime, duration: e.duration, cache: e.transferSize === 0 })); } function getNavMetrics() { const [nav] = performance.getEntriesByType('navigation'); return { domContentLoaded: nav.domContentLoadedEventEnd, loadEventEnd: nav.loadEventEnd }; } 长任务监测使用 `PerformanceObserver` 监听 `longtask`，在持久化写入期间避开关键渲染阶段。