| 描述（Description） |
origin-when-cross-origin" name="referrer">
// Required for ttfp & ttfcp
if ('PerformanceObserver' in window) {
const observer = new PerformanceObserver(list => {
for (const entry of list.getEntries()) {
if (['first-paint', 'first-contentful-paint'].includes(entry.name)) {
const key = entry.name === 'first-paint' ? '__ttfp' : '__ttfcp'
window[key] = entry.startTime + entry.duration
}
}
})
observer.observe({ entryTypes: ['resource', 'paint'] })
}
// Required for tti
if ('PerformanceLongTaskTiming' in window) {
const ttiObserver = (window.__tti = { e: [] })
ttiObserver. |