October 2024
Intermediate to advanced
286 pages
5h 48m
Spanish
Content preview from Libro de recetas de la API web
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Capítulo 16. Trabajar con la consola
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Introducción
A pesar de tus mejores intenciones, las cosas pueden y van a ir mal con tu código. Tienes a tu disposición varias herramientas de depuración. Los navegadores actuales llevan incorporados potentes depuradores que te permiten recorrer el código e inspeccionar los valores de variables y expresiones. A veces, sin embargo, puede que quieras simplificar las cosas y utilizar laconsola.
En su forma más básica, interactúas con la consola llamando a console.log con un mensaje. Este mensaje se imprime en la consola JavaScript del navegador. Aunque es más verboso que la depuración basada en puntos de interrupción, a veces puede ser útil registrar e inspeccionar valores en tiempo de ejecución.
Aparte de un simple console.log, hay otras cosas que puedes hacer con la consola, como agrupar mensajes, utilizar contadores, mostrar tablas e incluso dar estilo a tu salida con CSS. También hay otros niveles de registro (error, aviso, depuración) que puedes utilizar para categorizar y filtrar tus mensajes de consola.
Estilizar la salida de la consola
Problema
Quieres aplicar algo de CSS a la salida del registro de tu consola. Por ejemplo, quizá quieras aumentar el tamaño de la fuente y cambiar el color.
Solución
Utiliza la directiva %c en tu mensaje de registro para indicar qué texto quieres que tenga estilo. Por cada uso de %c
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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.
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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.