March 2025
Intermediate to advanced
286 pages
5h 53m
Italian
Content preview from Web API Cookbook
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Capitolo 16. Lavorare con la console
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Introduzione
Nonostante le tue migliori intenzioni, il tuo codice può andare e andrà storto. Esistono diversi strumenti di debug a tua disposizione. I browser odierni sono dotati di potenti debugger integrati che ti permettono di esaminare il codice e di controllare i valori delle variabili e delle espressioni. A volte, però, potresti voler rimanere sul semplice e usare laconsole.
Nella sua forma più elementare, interagisci con la console chiamando console.log con un messaggio. Questo messaggio viene stampato nella console JavaScript del browser. Sebbene sia più prolisso del debug basato sui breakpoint, a volte può essere utile registrare e ispezionare i valori in runtime.
Oltre al semplice console.log, ci sono altre cose che puoi fare con la console, come ad esempio raggruppare i messaggi, utilizzare contatori, visualizzare tabelle e persino stilizzare l'output con i CSS. Esistono anche altri livelli di log (error, warn, debug) che puoi utilizzare per classificare e filtrare i messaggi della console.
Stilizzare l'output della console
Problema
Vuoi applicare alcuni CSS all'output del log della tua console. Per esempio, forse vuoi ingrandire il carattere e cambiare il colore.
Soluzione
Usa la direttiva %c nel tuo messaggio di log per indicare il testo che vuoi sia stilizzato. Per ogni utilizzo di ...
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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.