March 2025
Intermediate to advanced
286 pages
5h 53m
Italian
Content preview from Web API Cookbook
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Capitolo 15. Misurare le prestazioni
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Introduzione
Ci sono molti strumenti di terze parti per misurare le prestazioni di un'applicazione JavaScript, ma anche il browser ha alcuni strumenti pratici integrati per catturare le metriche delle prestazioni.
L'API Navigation Timing è utilizzata per acquisire dati sulle prestazioni del caricamento iniziale della pagina. Puoi verificare quanto tempo ha impiegato la pagina a caricarsi, quanto tempo ha impiegato il DOM a diventare interattivo e altro ancora. Restituisce una serie di timestamp che indicano quando ogni evento si è verificato durante il caricamento della pagina.
L'API Resource Timing ti permette di verificare quanto tempo è stato necessario per scaricare le risorse ed effettuare le richieste di rete. Questo riguarda le risorse della pagina come i file HTML, i file CSS, i file JavaScript e le immagini. Copre anche le richieste asincrone come quelle effettuate con l'API Fetch.
L'API User Timing è un modo per calcolare il tempo trascorso di operazioni arbitrarie. Puoi creare dei segni di esecuzione, che sono punti nel tempo, e delle misure, che sono durate calcolate tra i segni.
Tutte queste API creano voci di performance in un buffer sulla pagina. Si tratta di un'unica raccolta di tutti i tipi di voci di performance. Puoi ispezionare questo buffer in qualsiasi momento e puoi anche utilizzare ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.