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href="/en-US/docs/Learn_web_development/Core/Frameworks_libraries/React_todo_list_beginning" class="only-in-en-us">Beginning our React todo list</a></li><li><a href="/es/docs/Learn_web_development/Core/Frameworks_libraries/React_components">Creando componentes en nuestra app de React</a></li><li><a href="/en-US/docs/Learn_web_development/Core/Frameworks_libraries/React_interactivity_events_state" class="only-in-en-us">React interactivity: Events and state</a></li><li><a href="/en-US/docs/Learn_web_development/Core/Frameworks_libraries/React_interactivity_filtering_conditional_rendering" class="only-in-en-us">React interactivity: Editing, filtering, conditional rendering</a></li><li><a href="/en-US/docs/Learn_web_development/Core/Frameworks_libraries/React_accessibility" class="only-in-en-us">Accessibility in React</a></li><li><a href="/en-US/docs/Learn_web_development/Core/Frameworks_libraries/React_resources" class="only-in-en-us">React resources</a></li></ol></details></li><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Core/Accessibility">Accessibility</a></summary><ol><li><a href="/es/docs/Learn_web_development/Core/Accessibility/What_is_accessibility">¿Qué es la accesibilidad?</a></li><li><a href="/en-US/docs/Learn_web_development/Core/Accessibility/Tooling" class="only-in-en-us">Accessibility tooling and assistive technology</a></li><li><a href="/es/docs/Learn_web_development/Core/Accessibility/HTML">HTML: Una buena base para la accesibilidad</a></li><li><a href="/es/docs/Learn_web_development/Core/Accessibility/CSS_and_JavaScript">Buenas prácticas de accesibilidad CSS y JavaScript</a></li><li><a href="/en-US/docs/Learn_web_development/Core/Accessibility/WAI-ARIA_basics" class="only-in-en-us">WAI-ARIA basics</a></li><li><a href="/en-US/docs/Learn_web_development/Core/Accessibility/Multimedia" class="only-in-en-us">Accessible multimedia</a></li><li><a href="/es/docs/Learn_web_development/Core/Accessibility/Mobile">Mobile accessibility</a></li><li><a href="/es/docs/Learn_web_development/Core/Accessibility/Accessibility_troubleshooting">Evaluación: Solución de problemas de accesibilidad</a></li></ol></details></li><li><a href="/en-US/docs/Learn_web_development/Core/Design_for_developers" class="only-in-en-us">Design for developers</a></li><li><a href="/es/docs/Learn_web_development/Core/Version_control">Version control</a></li><li class="section"><a href="/en-US/docs/Learn_web_development/Extensions" class="only-in-en-us">Extension modules</a></li><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects">Advanced JavaScript objects</a></summary><ol><li><a href="/es/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects/Object_prototypes">Prototipos de objetos</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects/Object-oriented_programming" class="only-in-en-us">Object-oriented programming</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects/Classes_in_JavaScript">Clases en JavaScript</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects/Object_building_practice">Ejercicio práctico de construcción de objetos</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects/Adding_bouncing_balls_features">Añadiendo características a nuestra demo de bouncing balls</a></li></ol></details></li><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Extensions/Client-side_APIs">Client-side web APIs</a></summary><ol><li><a href="/es/docs/Learn_web_development/Extensions/Client-side_APIs/Introduction">Introducción a las APIs web</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Client-side_APIs/Video_and_audio_APIs" class="only-in-en-us">Video and Audio APIs</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Client-side_APIs/Drawing_graphics" class="only-in-en-us">Drawing graphics</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Client-side_APIs/Client-side_storage">Almacenamiento del lado cliente</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Client-side_APIs/Third_party_APIs" class="only-in-en-us">Third-party APIs</a></li></ol></details></li><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Extensions/Async_JS">Asynchronous JavaScript</a></summary><ol><li><a href="/es/docs/Learn_web_development/Extensions/Async_JS/Introducing">Introducción a JavaScript asíncrono</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Async_JS/Promises" class="only-in-en-us">How to use promises</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Async_JS/Implementing_a_promise-based_API" class="only-in-en-us">How to implement a promise-based API</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Async_JS/Introducing_workers" class="only-in-en-us">Introducing workers</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Async_JS/Sequencing_animations" class="only-in-en-us">Challenge: Sequencing animations</a></li></ol></details></li><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Extensions/Forms">Web forms</a></summary><ol><li><a href="/es/docs/Learn_web_development/Extensions/Forms/Your_first_form">Mi primer formulario HTML</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Forms/How_to_structure_a_web_form">Cómo estructurar un formulario HTML</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Forms/Basic_native_form_controls">Controles de formulario originales</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Forms/HTML5_input_types">Tipos de input de HTML5</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Forms/Other_form_controls" class="only-in-en-us">Other form controls</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Forms/Styling_web_forms">Estilizando formularios HTML</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Forms/Advanced_form_styling" class="only-in-en-us">Advanced form styling</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Forms/UI_pseudo-classes" class="only-in-en-us">UI pseudo-classes</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Forms/Form_validation">Validación de formularios de datos</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Forms/Sending_and_retrieving_form_data">Sending form data</a></li></ol></details></li><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Extensions/Client-side_tools">Understanding client-side tools</a></summary><ol><li><a href="/en-US/docs/Learn_web_development/Extensions/Client-side_tools/Overview" class="only-in-en-us">Client-side tooling overview</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Client-side_tools/Package_management" class="only-in-en-us">Package management basics</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Client-side_tools/Introducing_complete_toolchain" class="only-in-en-us">Introducing a complete toolchain</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Client-side_tools/Deployment" class="only-in-en-us">Deploying our app</a></li></ol></details></li><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Extensions/Server-side">Server-side websites</a></summary><ol><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Extensions/Server-side/First_steps">Server-side first steps</a></summary><ol><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/First_steps/Introduction">Introducción al lado servidor</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/First_steps/Client-Server_overview">Visión General Cliente-Servidor</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/First_steps/Web_frameworks">Frameworks Web de lado servidor</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/First_steps/Website_security">Seguridad de Sitios Web</a></li></ol></details></li><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django">Django web framework (Python)</a></summary><ol><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/Introduction">Introducción a Django</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/development_environment">Puesta en marcha de un entorno de desarrollo Django</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/Tutorial_local_library_website">Tutorial Django: El Sitio Web de La Biblioteca Local</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/skeleton_website">Tutorial Django Parte 2: Creación del esqueleto del sitio web</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/Models">Tutorial Django Parte 3: Uso de modelos</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/Admin_site">Tutorial Django Parte 4: Sitio de Administración de Django</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/Home_page">Tutorial de Django Parte 5: Creación de tu página de inicio</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/Generic_views">Tutorial de Django Parte 6: Listas genéricas y vistas de detalle</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/Sessions">Tutorial de Django Parte 7: Framework de sesiones</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/Authentication">Tutorial de Django Parte 8: Autenticación y permisos de Usuario</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/Forms">Tutorial de Django Parte 9: Trabajo con formularios</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/Testing">Tutorial de Django Parte 10: Probando una aplicación web Django</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Django/Deployment">Tutorial de Django Parte 11: Desplegando Django a producción</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Server-side/Django/web_application_security" class="only-in-en-us">Django web application security</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Server-side/Django/django_assessment_blog" class="only-in-en-us">Assessment: DIY Django mini blog</a></li></ol></details></li><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs">Express web framework (Node.js)</a></summary><ol><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/Introduction">Introducción a Express/Node</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/development_environment">Setting up a Node development environment</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/Tutorial_local_library_website">Express Tutorial: El sitio web de la Biblioteca Local</a></li><li><a href="/es/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/skeleton_website">Express Tutorial Part 2: Creating a skeleton website</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/mongoose" class="only-in-en-us">Express Tutorial Part 3: Using a Database (with Mongoose)</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/routes" class="only-in-en-us">Express Tutorial Part 4: Routes and controllers</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/Displaying_data" class="only-in-en-us">Express Tutorial Part 5: Displaying library data</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/forms" class="only-in-en-us">Express Tutorial Part 6: Working with forms</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/deployment" class="only-in-en-us">Express Tutorial Part 7: Deploying to production</a></li></ol></details></li></ol></details></li><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Extensions/Performance">Web performance</a></summary><ol><li><a href="/en-US/docs/Learn_web_development/Extensions/Performance/why_web_performance" class="only-in-en-us">The "why" of web performance</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Performance/What_is_web_performance" class="only-in-en-us">What is web performance?</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Performance/Perceived_performance" class="only-in-en-us">Perceived performance</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Performance/Measuring_performance" class="only-in-en-us">Measuring performance</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Performance/Multimedia" class="only-in-en-us">Multimedia: Images</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Performance/video" class="only-in-en-us">Multimedia: video</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Performance/JavaScript" class="only-in-en-us">JavaScript performance optimization</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Performance/HTML" class="only-in-en-us">HTML performance optimization</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Performance/CSS" class="only-in-en-us">CSS performance optimization</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Performance/business_case_for_performance" class="only-in-en-us">The business case for web performance</a></li></ol></details></li><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Extensions/Testing">Testing</a></summary><ol><li><a href="/en-US/docs/Learn_web_development/Extensions/Testing/Introduction" class="only-in-en-us">Introduction to cross-browser testing</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Testing/Testing_strategies" class="only-in-en-us">Strategies for carrying out testing</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Testing/HTML_and_CSS" class="only-in-en-us">Handling common HTML and CSS problems</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Testing/Feature_detection" class="only-in-en-us">Implementing feature detection</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Testing/Automated_testing" class="only-in-en-us">Introduction to automated testing</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Testing/Your_own_automation_environment" class="only-in-en-us">Setting up your own test automation environment</a></li></ol></details></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Transform_animate" class="only-in-en-us">Transform and animate CSS</a></li><li><a href="/en-US/docs/Learn_web_development/Extensions/Security_privacy" class="only-in-en-us">Security and privacy</a></li><li class="section">Further resources</li><li class="toggle"><details><summary><a href="/es/docs/Learn_web_development/Howto">How to solve common problems</a></summary><ol><li><a href="/es/docs/Learn_web_development/Howto/Solve_HTML_problems">Solución de problemas comunes de HTML</a></li><li><a href="/es/docs/Learn_web_development/Howto/Solve_CSS_problems">Usa CSS para resolver problemas comunes</a></li><li><a href="/es/docs/Learn_web_development/Howto/Solve_JavaScript_problems">Resuelva problemas comunes en su código JavaScript</a></li><li><a href="/en-US/docs/Learn_web_development/Howto/Web_mechanics" class="only-in-en-us">Web mechanics</a></li><li><a href="/en-US/docs/Learn_web_development/Howto/Tools_and_setup" class="only-in-en-us">Tools and setup</a></li><li><a href="/en-US/docs/Learn_web_development/Howto/Design_and_accessibility" class="only-in-en-us">Design and accessibility</a></li></ol></details></li><li><a href="/en-US/docs/Learn_web_development/About" class="only-in-en-us">About</a></li><li><a href="/en-US/docs/Learn_web_development/Educators" class="only-in-en-us">Resources for educators</a></li><li><a href="/en-US/docs/Learn_web_development/Changelog" class="only-in-en-us">Changelog</a></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">En este artículo</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#pre-requisitos">Pre-requisitos</a></li><li class="document-toc-item "><a class="document-toc-link" href="#guías">Guías</a></li><li class="document-toc-item "><a class="document-toc-link" href="#evaluaciones">Evaluaciones</a></li><li class="document-toc-item "><a class="document-toc-link" href="#ver_también">Ver también</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="es"><header><h1>Elementos básicos de JavaScript</h1></header><div class="section-content"><p>En este módulo, continuamos nuestra cobertura de todas las características clave de JavaScript, tornando nuestra atención a tipos de código comúnmente encontrados tales como enunciados condicionales, bucles (loops), funciones, y eventos. Ya has visto estas cosas en este curso, pero solo de pasada aquí lo hablaremos mas explícitamente.</p></div><section aria-labelledby="quieres_transformarte_en_un_desarrollador_web_front-end"><h3 id="quieres_transformarte_en_un_desarrollador_web_front-end"><a href="#quieres_transformarte_en_un_desarrollador_web_front-end">Quieres transformarte en un desarrollador web front-end?</a></h3><div class="section-content"><p>Hemos reunido un curso que incluye toda la información esencial que necesitas para trabajar hacia tu objetivo.</p> <p><a href="/es/docs/orphaned/Learn/Front-end_web_developer">Empieza aquí</a></p></div></section><section aria-labelledby="pre-requisitos"><h2 id="pre-requisitos"><a href="#pre-requisitos">Pre-requisitos</a></h2><div class="section-content"><p>Antes de empezar este módulo, deberías ya tener alguna familiaridad con lo básico de <a href="/es/docs/conflicting/Learn_web_development/Core/Structuring_content">HTML</a> y <a href="/es/docs/conflicting/Learn_web_development/Core/Styling_basics">CSS</a>, y también deberías haber trabajado todos lo módulos previos, <a href="/es/docs/conflicting/Learn_web_development/Core/Scripting">JavaScript primeros pasos</a>.</p> <div class="notecard note"> <p><strong>Nota:</strong> Si estas trabajando en una computadora/tablet/otro dispositivo donde no tienes la capacidad de crear tus propios archivos, podrías practicar (la mayoría de) los ejemplos de código en un programa en linea tales como <a href="https://jsbin.com/" class="external" target="_blank">JSBin</a> o <a href="https://glitch.com/" class="external" target="_blank">Glitch</a>.</p> </div></div></section><section aria-labelledby="guías"><h2 id="guías"><a href="#guías">Guías</a></h2><div class="section-content"><dl> <dt id="tomando_decisiones_en_tu_código_—_condicionales"><a href="/es/docs/Learn_web_development/Core/Scripting/Conditionals">Tomando decisiones en tu código — condicionales</a></dt> <dd> <p>En cualquier lenguaje de programación, el código necesita tomar decisiones y efectuar acciones consiguientemente dependiendo de las diferentes ordenes ingresadas. Por ejemplo, en un juego, si el numero de vidas del jugador es 0, entonces se termina el juego. En una aplicación del clima, si esta siendo vista por la mañana, muestra un gráfico del amanecer; muestra estrellas y una luna si es de noche. En este artículo exploraremos como los condicionales estructuran el trabajo en Javascript.</p> </dd> <dt id="bucles_de_código"><a href="/es/docs/Learn_web_development/Core/Scripting/Loops">Bucles de código</a></dt> <dd> <p>A veces necesitas que una tarea se haga más de una vez. Por ejemplo, revisar toda una lista de nombres. En programación, los bucles ('<em>loops'</em> en inglés) hacen este trabajo muy bien. Aca veremos la estructura de loops en Javascript.</p> </dd> <dt id="funciones_—_bloques_de_código_reusables"><a href="/en-US/docs/Learn_web_development/Core/Scripting/Functions" class="only-in-en-us">Funciones — bloques de código reusables</a></dt> <dd> <p>Otro concepto fundamental en código es <strong>funciones. Funciones</strong> te permite almacenar una pieza de código que ejecuta una sola tarea dentro de un bloque definido, y después llamar ese código cuando lo necesitas usando un comando corto en lugar de tener que escribir el mismo código varias veces. En este articulo exploraremos conceptos fundamentales detrás de las funciones tales como sintaxis básica, cómo invocar y definir funciones, ámbito o alcance (scope), y parámetros.</p> </dd> <dt id="crea_tu_propia_función"><a href="/es/docs/Learn_web_development/Core/Scripting/Build_your_own_function">Crea tu propia función</a></dt> <dd> <p>Con la información presentada en el artículo anterior, este artículo, pretende demostrar una parte práctica. Se podrá desarrollar una función propia, y durante el desarrollo se presentarán algunos consejos prácticos y útiles para trabajar con funciones.</p> </dd> <dt id="una_función_devuelve_valores"><a href="/es/docs/Learn_web_development/Core/Scripting/Return_values">Una función devuelve valores</a></dt> <dd> <p>Un concepto fundamental que ha de tenerse en cuenta, es que las funciones pueden devolver valores al finalizar su ejecución, aunque algunas funciones también pueden no devolver ningún valor. Es importante entender como son esos valores, qué tipos pueden tener y cómo aprovechar el valor devuelto por la función en el programa.</p> </dd> <dt id="introducción_a_eventos"><a href="/es/docs/Learn_web_development/Core/Scripting/Events">Introducción a eventos</a></dt> <dd> <p>Los eventos son acciones u ocurrencias que aparecen durante la ejecución del programa, y que son reportadas por el sistema, de forma que se pueda responder a los eventos de la forma deseada. Por ejemplo, si un usuario hace un click en un botón de una página web, puede que se quiera que ese evento inicie una acción en el que se muestre cierta información en un cuadro de información. En este último artículo se presentarán y describirán los conceptos necesarios con respecto a los eventos, y como funcionan en un navegador.</p> </dd> </dl></div></section><section aria-labelledby="evaluaciones"><h2 id="evaluaciones"><a href="#evaluaciones">Evaluaciones</a></h2><div class="section-content"><p>La siguiente evaluación probara tu entendimiento de lo básico de Javascript cubierto en las guias anteriores.</p> <dl> <dt id="galeria_de_imagen"><a href="/en-US/docs/Learn_web_development/Core/Scripting/Image_gallery" class="only-in-en-us">Galeria de imagen</a></dt> <dd> <p>Ahora que hemos visto los bloques constructores fundamentales de JavaScript, probaremos tus conocimientos en bucles, funciones, condicionales y eventos construyendo un item bastante común en muchos sitios web — una galería de imágenes creada con JavaScript.</p> </dd> </dl></div></section><section aria-labelledby="ver_también"><h2 id="ver_también"><a href="#ver_también">Ver también</a></h2><div class="section-content"><dl> <dt id="aprender_javascript"><a href="https://learnjavascript.online/" class="external" target="_blank">Aprender JavaScript</a></dt> <dd> <p>Un excelente recurso para aspirantes a desarrolladores web — Aprenda JavaScript en un entorno interactivo, con lecciones cortas y pruebas interactivas, guiadas por una evaluación automatizada. Las primeras 40 lecciones son gratuitas, y el curso completo está disponible por un pequeño pago único.</p> </dd> </dl></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" role="none"><mask id="b" fill="#fff"><path d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 33.969-3.39c11.443 1.39 22.401 5.295 32.024 11.411s17.656 14.28 23.476 23.86c5.819 9.579 9.269 20.318 10.083 31.385a69.85 69.85 0 0 1-5.387 32.44c-4.358 10.272-11.115 19.443-19.747 26.801-8.632 7.359-18.908 12.709-30.034 15.637l-6.17-21.698c7.666-2.017 14.746-5.703 20.694-10.773 5.948-5.071 10.603-11.389 13.606-18.467a48.14 48.14 0 0 0 3.712-22.352c-.561-7.625-2.938-15.025-6.948-21.625s-9.544-12.226-16.175-16.44-14.181-6.904-22.065-7.863a53.75 53.75 0 0 0-23.405 2.336c-7.513 2.495-14.327 6.62-19.918 12.053z"></path></mask><path stroke="url(#a)" 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Content available under <a href="/es/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/es/docs/Learn_web_development/Core/Scripting","doc":{"body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p>En este módulo, continuamos nuestra cobertura de todas las características clave de JavaScript, tornando nuestra atención a tipos de código comúnmente encontrados tales como enunciados condicionales, bucles (loops), funciones, y eventos. Ya has visto estas cosas en este curso, pero solo de pasada aquí lo hablaremos mas explícitamente.</p>"}},{"type":"prose","value":{"id":"quieres_transformarte_en_un_desarrollador_web_front-end","title":"Quieres transformarte en un desarrollador web front-end?","isH3":true,"content":"<p>Hemos reunido un curso que incluye toda la información esencial que necesitas para trabajar hacia tu objetivo.</p>\n<p><a href=\"/es/docs/orphaned/Learn/Front-end_web_developer\">Empieza aquí</a></p>"}},{"type":"prose","value":{"id":"pre-requisitos","title":"Pre-requisitos","isH3":false,"content":"<p>Antes de empezar este módulo, deberías ya tener alguna familiaridad con lo básico de <a href=\"/es/docs/conflicting/Learn_web_development/Core/Structuring_content\">HTML</a> y <a href=\"/es/docs/conflicting/Learn_web_development/Core/Styling_basics\">CSS</a>, y también deberías haber trabajado todos lo módulos previos, <a href=\"/es/docs/conflicting/Learn_web_development/Core/Scripting\">JavaScript primeros pasos</a>.</p>\n<div class=\"notecard note\">\n<p><strong>Nota:</strong>\nSi estas trabajando en una computadora/tablet/otro dispositivo donde no tienes la capacidad de crear tus propios archivos, podrías practicar (la mayoría de) los ejemplos de código en un programa en linea tales como <a href=\"https://jsbin.com/\" class=\"external\" target=\"_blank\">JSBin</a> o <a href=\"https://glitch.com/\" class=\"external\" target=\"_blank\">Glitch</a>.</p>\n</div>"}},{"type":"prose","value":{"id":"guías","title":"Guías","isH3":false,"content":"<dl>\n<dt id=\"tomando_decisiones_en_tu_código_—_condicionales\"><a href=\"/es/docs/Learn_web_development/Core/Scripting/Conditionals\">Tomando decisiones en tu código — condicionales</a></dt>\n<dd>\n<p>En cualquier lenguaje de programación, el código necesita tomar decisiones y efectuar acciones consiguientemente dependiendo de las diferentes ordenes ingresadas. Por ejemplo, en un juego, si el numero de vidas del jugador es 0, entonces se termina el juego. En una aplicación del clima, si esta siendo vista por la mañana, muestra un gráfico del amanecer; muestra estrellas y una luna si es de noche. En este artículo exploraremos como los condicionales estructuran el trabajo en Javascript.</p>\n</dd>\n<dt id=\"bucles_de_código\"><a href=\"/es/docs/Learn_web_development/Core/Scripting/Loops\">Bucles de código</a></dt>\n<dd>\n<p>A veces necesitas que una tarea se haga más de una vez. Por ejemplo, revisar toda una lista de nombres. En programación, los bucles ('<em>loops'</em> en inglés) hacen este trabajo muy bien. Aca veremos la estructura de loops en Javascript.</p>\n</dd>\n<dt id=\"funciones_—_bloques_de_código_reusables\"><a href=\"/en-US/docs/Learn_web_development/Core/Scripting/Functions\" class=\"only-in-en-us\">Funciones — bloques de código reusables</a></dt>\n<dd>\n<p>Otro concepto fundamental en código es <strong>funciones. Funciones</strong> te permite almacenar una pieza de código que ejecuta una sola tarea dentro de un bloque definido, y después llamar ese código cuando lo necesitas usando un comando corto en lugar de tener que escribir el mismo código varias veces. En este articulo exploraremos conceptos fundamentales detrás de las funciones tales como sintaxis básica, cómo invocar y definir funciones, ámbito o alcance (scope), y parámetros.</p>\n</dd>\n<dt id=\"crea_tu_propia_función\"><a href=\"/es/docs/Learn_web_development/Core/Scripting/Build_your_own_function\">Crea tu propia función</a></dt>\n<dd>\n<p>Con la información presentada en el artículo anterior, este artículo, pretende demostrar una parte práctica. Se podrá desarrollar una función propia, y durante el desarrollo se presentarán algunos consejos prácticos y útiles para trabajar con funciones.</p>\n</dd>\n<dt id=\"una_función_devuelve_valores\"><a href=\"/es/docs/Learn_web_development/Core/Scripting/Return_values\">Una función devuelve valores</a></dt>\n<dd>\n<p>Un concepto fundamental que ha de tenerse en cuenta, es que las funciones pueden devolver valores al finalizar su ejecución, aunque algunas funciones también pueden no devolver ningún valor. Es importante entender como son esos valores, qué tipos pueden tener y cómo aprovechar el valor devuelto por la función en el programa.</p>\n</dd>\n<dt id=\"introducción_a_eventos\"><a href=\"/es/docs/Learn_web_development/Core/Scripting/Events\">Introducción a eventos</a></dt>\n<dd>\n<p>Los eventos son acciones u ocurrencias que aparecen durante la ejecución del programa, y que son reportadas por el sistema, de forma que se pueda responder a los eventos de la forma deseada. Por ejemplo, si un usuario hace un click en un botón de una página web, puede que se quiera que ese evento inicie una acción en el que se muestre cierta información en un cuadro de información. En este último artículo se presentarán y describirán los conceptos necesarios con respecto a los eventos, y como funcionan en un navegador.</p>\n</dd>\n</dl>"}},{"type":"prose","value":{"id":"evaluaciones","title":"Evaluaciones","isH3":false,"content":"<p>La siguiente evaluación probara tu entendimiento de lo básico de Javascript cubierto en las guias anteriores.</p>\n<dl>\n<dt id=\"galeria_de_imagen\"><a href=\"/en-US/docs/Learn_web_development/Core/Scripting/Image_gallery\" class=\"only-in-en-us\">Galeria de imagen</a></dt>\n<dd>\n<p>Ahora que hemos visto los bloques constructores fundamentales de JavaScript, probaremos tus conocimientos en bucles, funciones, condicionales y eventos construyendo un item bastante común en muchos sitios web — una galería de imágenes creada con JavaScript.</p>\n</dd>\n</dl>"}},{"type":"prose","value":{"id":"ver_también","title":"Ver también","isH3":false,"content":"<dl>\n<dt id=\"aprender_javascript\"><a href=\"https://learnjavascript.online/\" class=\"external\" target=\"_blank\">Aprender JavaScript</a></dt>\n<dd>\n<p>Un excelente recurso para aspirantes a desarrolladores web — Aprenda JavaScript en un entorno interactivo, con lecciones cortas y pruebas interactivas, guiadas por una evaluación automatizada. Las primeras 40 lecciones son gratuitas, y el curso completo está disponible por un pequeño pago único.</p>\n</dd>\n</dl>"}}],"isActive":true,"isMarkdown":true,"isTranslated":true,"locale":"es","mdn_url":"/es/docs/Learn_web_development/Core/Scripting","modified":"2024-12-21T04:32:59.000Z","native":"Español","noIndexing":false,"other_translations":[{"locale":"en-US","title":"Dynamic scripting with JavaScript","native":"English (US)"},{"locale":"de","title":"Dynamisches Skripting mit JavaScript","native":"Deutsch"},{"locale":"fr","title":"Premiers pas en JavaScript","native":"Français"},{"locale":"ja","title":"JavaScript による動的スクリプティング","native":"日本語"},{"locale":"ko","title":"JavaScript 구성요소","native":"한국어"},{"locale":"pt-BR","title":"Elementos construtivos do Javascript","native":"Português (do Brasil)"},{"locale":"ru","title":"Структурные элементы JavaScript","native":"Русский"},{"locale":"zh-CN","title":"创建 JavaScript 代码块","native":"中文 (简体)"},{"locale":"zh-TW","title":"JavaScript building blocks","native":"正體中文 (繁體)"}],"pageTitle":"Elementos básicos de JavaScript - Aprende desarrollo web | MDN","parents":[{"uri":"/es/docs/Learn_web_development","title":"Aprende desarrollo web"},{"uri":"/en-US/docs/Learn_web_development/Core","title":"Core learning modules"},{"uri":"/es/docs/Learn_web_development/Core/Scripting","title":"Elementos básicos de JavaScript"}],"popularity":null,"short_title":"Elementos básicos de JavaScript","sidebarHTML":"<ol><li class=\"section\"><a href=\"/en-US/docs/Learn_web_development/Getting_started\" class=\"only-in-en-us\">Getting started modules</a></li><li class=\"toggle\"><details><summary><a href=\"/en-US/docs/Learn_web_development/Getting_started/Environment_setup\" class=\"only-in-en-us\">Environment setup</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Getting_started/Environment_setup/Installing_software\">Instalación de software básico</a></li><li><a href=\"/es/docs/Learn_web_development/Getting_started/Environment_setup/Browsing_the_web\">¿Cuál es la diferencia entre la página web, el sitio web, el servidor web y el motor de búsqueda?</a></li><li><a href=\"/en-US/docs/Learn_web_development/Getting_started/Environment_setup/Code_editors\" class=\"only-in-en-us\">Code editors</a></li><li><a href=\"/es/docs/Learn_web_development/Getting_started/Environment_setup/Dealing_with_files\">Manejo de archivos</a></li><li><a href=\"/en-US/docs/Learn_web_development/Getting_started/Environment_setup/Command_line\" class=\"only-in-en-us\">Command line crash course</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Getting_started/Your_first_website\">Your first website</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Getting_started/Your_first_website/What_will_your_website_look_like\">¿Cuál será la apariencia de tu sitio Web?</a></li><li><a href=\"/es/docs/Learn_web_development/Getting_started/Your_first_website/Creating_the_content\">Conceptos básicos de HTML</a></li><li><a href=\"/es/docs/Learn_web_development/Getting_started/Your_first_website/Styling_the_content\">CSS básico</a></li><li><a href=\"/es/docs/Learn_web_development/Getting_started/Your_first_website/Adding_interactivity\">Fundamentos de JavaScript</a></li><li><a href=\"/es/docs/Learn_web_development/Getting_started/Your_first_website/Publishing_your_website\">Publicar tu sitio web</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Getting_started/Web_standards\">Web standards</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Getting_started/Web_standards/How_the_web_works\">Cómo funciona la web</a></li><li><a href=\"/es/docs/Learn_web_development/Getting_started/Web_standards/The_web_standards_model\">La web y los estándares web</a></li><li><a href=\"/en-US/docs/Learn_web_development/Getting_started/Web_standards/How_browsers_load_websites\" class=\"only-in-en-us\">How browsers load websites</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/en-US/docs/Learn_web_development/Getting_started/Soft_skills\" class=\"only-in-en-us\">Soft skills</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Getting_started/Soft_skills/Research_and_learning\">Aprender y obtener ayuda</a></li><li><a href=\"/en-US/docs/Learn_web_development/Getting_started/Soft_skills/Collaboration_and_teamwork\" class=\"only-in-en-us\">Collaboration and teamwork</a></li><li><a href=\"/en-US/docs/Learn_web_development/Getting_started/Soft_skills/Workflows_and_processes\" class=\"only-in-en-us\">Workflows and processes</a></li><li><a href=\"/en-US/docs/Learn_web_development/Getting_started/Soft_skills/Job_interviews\" class=\"only-in-en-us\">Succeeding in job interviews</a></li></ol></details></li><li class=\"section\"><a href=\"/en-US/docs/Learn_web_development/Core\" class=\"only-in-en-us\">Core modules</a></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Core/Structuring_content\">Structuring content with HTML</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Basic_HTML_syntax\">Primeros pasos con HTML</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Webpage_metadata\">¿Qué hay en la cabecera? Metadatos en HTML</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Headings_and_paragraphs\">Fundamentos de texto en HTML</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Structuring_content/Emphasis_and_importance\" class=\"only-in-en-us\">Emphasis and importance</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Lists\">Listas</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Structuring_documents\">Estructura web y documentación</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Advanced_text_features\">Formateo de texto avanzado</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Creating_links\">Crear hipervínculos</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Marking_up_a_letter\">Marcando una Carta</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Structuring_a_page_of_content\">Estructuración de una Página de contenido</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/HTML_images\">Imágenes en HTML</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/HTML_video_and_audio\">Contenido de audio y video</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Mozilla_splash_page\">Página de bienvenida de Mozilla</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/HTML_table_basics\">Conceptos básicos de las tablas HTML</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Table_accessibility\">Funciones avanzadas de las tablas HTML y accesibilidad</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Planet_data_table\">Evaluación: Estructurando datos planetarios</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/HTML_forms\">Formularios y botones en HTML</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Structuring_content/Debugging_HTML\">Depurar el HTML</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Core/Styling_basics\">CSS styling basics</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/What_is_CSS\">Cómo funciona CSS</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Getting_started\">Empezar con CSS</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Styling_a_bio_page\">Usa tu nuevo conocimiento</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Basic_selectors\">Selectores CSS</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Attribute_selectors\">Selectores de atributo</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Pseudo_classes_and_elements\">Pseudoclases y pseudoelementos</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Combinators\">Combinadores</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Box_model\">El modelo de caja</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Handling_conflicts\">Cascada y herencia</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Values_and_units\">Valores y unidades CSS</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Sizing\">Dimensionar elementos en CSS</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Backgrounds_and_borders\">Fondos y bordes</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Overflow\">Contenido desbordado</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Images_media_forms\">Imágenes, medios y elementos de formulario</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Tables\">Estilizando tablas</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Debugging_CSS\">Depurar el CSS</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Styling_basics/Fundamental_CSS_comprehension\">Comprensión de los fundamentos de CSS</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Styling_basics/Fancy_letterheaded_paper\" class=\"only-in-en-us\">Challenge: Creating fancy letterheaded paper</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Styling_basics/Cool-looking_box\" class=\"only-in-en-us\">Challenge: A cool-looking box</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Core/Text_styling\">CSS text styling</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Core/Text_styling/Fundamentals\">Fundamentos de texto y fuentes tipográficas</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Text_styling/Styling_lists\">Aplicación de estilo a listas</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Text_styling/Styling_links\">Dar estilo a los enlaces</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Text_styling/Web_fonts\">Fuentes web</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Text_styling/Typesetting_a_homepage\" class=\"only-in-en-us\">Challenge: Typesetting a community school homepage</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Core/CSS_layout\">CSS layout</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Core/CSS_layout/Introduction\">Introducción al diseño en CSS</a></li><li><a href=\"/es/docs/Learn_web_development/Core/CSS_layout/Floats\">Floats</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/CSS_layout/Positioning\" class=\"only-in-en-us\">Positioning</a></li><li><a href=\"/es/docs/Learn_web_development/Core/CSS_layout/Flexbox\">Flexbox</a></li><li><a href=\"/es/docs/Learn_web_development/Core/CSS_layout/Grids\">Cuadrículas</a></li><li><a href=\"/es/docs/Learn_web_development/Core/CSS_layout/Responsive_Design\">Diseño receptivo</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/CSS_layout/Media_queries\" class=\"only-in-en-us\">Media query fundamentals</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/CSS_layout/Fundamental_Layout_Comprehension\" class=\"only-in-en-us\">Challenge: Fundamental layout comprehension</a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary><em><a href=\"/es/docs/Learn_web_development/Core/Scripting\" aria-current=\"page\">Dynamic scripting with JavaScript</a></em></summary><ol><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/What_is_JavaScript\">¿Qué es JavaScript?</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/A_first_splash\">Un primer acercamiento a JavaScript</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/What_went_wrong\">¿Qué ha salido mal? Corrigiendo JavaScript</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Variables\">Almacenando la información que necesitas - Variables</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Math\">Matemáticas básicas en JavaScript — números y operadores</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Strings\">Manejar texto — cadenas en JavaScript</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Useful_string_methods\">Métodos útiles con cadenas</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Arrays\">Arreglos</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Silly_story_generator\">Generador de historias absurdas</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Conditionals\">Tomando decisiones en tu código — condicionales</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Loops\">Código de bucle</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Scripting/Functions\" class=\"only-in-en-us\">Functions — reusable blocks of code</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Build_your_own_function\">Construye tu propia función</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Return_values\">Una función retorna valores</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Events\">Introducción a los eventos</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Scripting/Event_bubbling\" class=\"only-in-en-us\">Event bubbling</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Scripting/Image_gallery\" class=\"only-in-en-us\">Challenge: Image gallery</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Object_basics\">Conceptos básicos de los objetos JavaScript</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Scripting/DOM_scripting\" class=\"only-in-en-us\">DOM scripting introduction</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/Network_requests\">AJAX</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Scripting/JSON\">Trabajando con JSON</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Scripting/Debugging_JavaScript\" class=\"only-in-en-us\">Debugging JavaScript and handling errors</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Core/Frameworks_libraries\">JavaScript frameworks and libraries</a></summary><ol><li><a href=\"/en-US/docs/Learn_web_development/Core/Frameworks_libraries/Introduction\" class=\"only-in-en-us\">Introduction to client-side frameworks</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Frameworks_libraries/Main_features\" class=\"only-in-en-us\">Framework main features</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Frameworks_libraries/React_getting_started\">Primeros pasos en React</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Frameworks_libraries/React_todo_list_beginning\" class=\"only-in-en-us\">Beginning our React todo list</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Frameworks_libraries/React_components\">Creando componentes en nuestra app de React</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Frameworks_libraries/React_interactivity_events_state\" class=\"only-in-en-us\">React interactivity: Events and state</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Frameworks_libraries/React_interactivity_filtering_conditional_rendering\" class=\"only-in-en-us\">React interactivity: Editing, filtering, conditional rendering</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Frameworks_libraries/React_accessibility\" class=\"only-in-en-us\">Accessibility in React</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Frameworks_libraries/React_resources\" class=\"only-in-en-us\">React resources</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Core/Accessibility\">Accessibility</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Core/Accessibility/What_is_accessibility\">¿Qué es la accesibilidad?</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Accessibility/Tooling\" class=\"only-in-en-us\">Accessibility tooling and assistive technology</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Accessibility/HTML\">HTML: Una buena base para la accesibilidad</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Accessibility/CSS_and_JavaScript\">Buenas prácticas de accesibilidad CSS y JavaScript</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Accessibility/WAI-ARIA_basics\" class=\"only-in-en-us\">WAI-ARIA basics</a></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Accessibility/Multimedia\" class=\"only-in-en-us\">Accessible multimedia</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Accessibility/Mobile\">Mobile accessibility</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Accessibility/Accessibility_troubleshooting\">Evaluación: Solución de problemas de accesibilidad</a></li></ol></details></li><li><a href=\"/en-US/docs/Learn_web_development/Core/Design_for_developers\" class=\"only-in-en-us\">Design for developers</a></li><li><a href=\"/es/docs/Learn_web_development/Core/Version_control\">Version control</a></li><li class=\"section\"><a href=\"/en-US/docs/Learn_web_development/Extensions\" class=\"only-in-en-us\">Extension modules</a></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects\">Advanced JavaScript objects</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects/Object_prototypes\">Prototipos de objetos</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects/Object-oriented_programming\" class=\"only-in-en-us\">Object-oriented programming</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects/Classes_in_JavaScript\">Clases en JavaScript</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects/Object_building_practice\">Ejercicio práctico de construcción de objetos</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Advanced_JavaScript_objects/Adding_bouncing_balls_features\">Añadiendo características a nuestra demo de bouncing balls</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Extensions/Client-side_APIs\">Client-side web APIs</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Extensions/Client-side_APIs/Introduction\">Introducción a las APIs web</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Client-side_APIs/Video_and_audio_APIs\" class=\"only-in-en-us\">Video and Audio APIs</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Client-side_APIs/Drawing_graphics\" class=\"only-in-en-us\">Drawing graphics</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Client-side_APIs/Client-side_storage\">Almacenamiento del lado cliente</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Client-side_APIs/Third_party_APIs\" class=\"only-in-en-us\">Third-party APIs</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Extensions/Async_JS\">Asynchronous JavaScript</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Extensions/Async_JS/Introducing\">Introducción a JavaScript asíncrono</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Async_JS/Promises\" class=\"only-in-en-us\">How to use promises</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Async_JS/Implementing_a_promise-based_API\" class=\"only-in-en-us\">How to implement a promise-based API</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Async_JS/Introducing_workers\" class=\"only-in-en-us\">Introducing workers</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Async_JS/Sequencing_animations\" class=\"only-in-en-us\">Challenge: Sequencing animations</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Extensions/Forms\">Web forms</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Extensions/Forms/Your_first_form\">Mi primer formulario HTML</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Forms/How_to_structure_a_web_form\">Cómo estructurar un formulario HTML</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Forms/Basic_native_form_controls\">Controles de formulario originales</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Forms/HTML5_input_types\">Tipos de input de HTML5</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Forms/Other_form_controls\" class=\"only-in-en-us\">Other form controls</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Forms/Styling_web_forms\">Estilizando formularios HTML</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Forms/Advanced_form_styling\" class=\"only-in-en-us\">Advanced form styling</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Forms/UI_pseudo-classes\" class=\"only-in-en-us\">UI pseudo-classes</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Forms/Form_validation\">Validación de formularios de datos</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Forms/Sending_and_retrieving_form_data\">Sending form data</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Extensions/Client-side_tools\">Understanding client-side tools</a></summary><ol><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Client-side_tools/Overview\" class=\"only-in-en-us\">Client-side tooling overview</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Client-side_tools/Package_management\" class=\"only-in-en-us\">Package management basics</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Client-side_tools/Introducing_complete_toolchain\" class=\"only-in-en-us\">Introducing a complete toolchain</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Client-side_tools/Deployment\" class=\"only-in-en-us\">Deploying our app</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Extensions/Server-side\">Server-side websites</a></summary><ol><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/First_steps\">Server-side first steps</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/First_steps/Introduction\">Introducción al lado servidor</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/First_steps/Client-Server_overview\">Visión General Cliente-Servidor</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/First_steps/Web_frameworks\">Frameworks Web de lado servidor</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/First_steps/Website_security\">Seguridad de Sitios Web</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django\">Django web framework (Python)</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/Introduction\">Introducción a Django</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/development_environment\">Puesta en marcha de un entorno de desarrollo Django</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/Tutorial_local_library_website\">Tutorial Django: El Sitio Web de La Biblioteca Local</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/skeleton_website\">Tutorial Django Parte 2: Creación del esqueleto del sitio web</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/Models\">Tutorial Django Parte 3: Uso de modelos</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/Admin_site\">Tutorial Django Parte 4: Sitio de Administración de Django</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/Home_page\">Tutorial de Django Parte 5: Creación de tu página de inicio</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/Generic_views\">Tutorial de Django Parte 6: Listas genéricas y vistas de detalle</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/Sessions\">Tutorial de Django Parte 7: Framework de sesiones</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/Authentication\">Tutorial de Django Parte 8: Autenticación y permisos de Usuario</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/Forms\">Tutorial de Django Parte 9: Trabajo con formularios</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/Testing\">Tutorial de Django Parte 10: Probando una aplicación web Django</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Django/Deployment\">Tutorial de Django Parte 11: Desplegando Django a producción</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Server-side/Django/web_application_security\" class=\"only-in-en-us\">Django web application security</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Server-side/Django/django_assessment_blog\" class=\"only-in-en-us\">Assessment: DIY Django mini blog</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs\">Express web framework (Node.js)</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/Introduction\">Introducción a Express/Node</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/development_environment\">Setting up a Node development environment</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/Tutorial_local_library_website\">Express Tutorial: El sitio web de la Biblioteca Local</a></li><li><a href=\"/es/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/skeleton_website\">Express Tutorial Part 2: Creating a skeleton website</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/mongoose\" class=\"only-in-en-us\">Express Tutorial Part 3: Using a Database (with Mongoose)</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/routes\" class=\"only-in-en-us\">Express Tutorial Part 4: Routes and controllers</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/Displaying_data\" class=\"only-in-en-us\">Express Tutorial Part 5: Displaying library data</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/forms\" class=\"only-in-en-us\">Express Tutorial Part 6: Working with forms</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Server-side/Express_Nodejs/deployment\" class=\"only-in-en-us\">Express Tutorial Part 7: Deploying to production</a></li></ol></details></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Extensions/Performance\">Web performance</a></summary><ol><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Performance/why_web_performance\" class=\"only-in-en-us\">The \"why\" of web performance</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Performance/What_is_web_performance\" class=\"only-in-en-us\">What is web performance?</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Performance/Perceived_performance\" class=\"only-in-en-us\">Perceived performance</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Performance/Measuring_performance\" class=\"only-in-en-us\">Measuring performance</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Performance/Multimedia\" class=\"only-in-en-us\">Multimedia: Images</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Performance/video\" class=\"only-in-en-us\">Multimedia: video</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Performance/JavaScript\" class=\"only-in-en-us\">JavaScript performance optimization</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Performance/HTML\" class=\"only-in-en-us\">HTML performance optimization</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Performance/CSS\" class=\"only-in-en-us\">CSS performance optimization</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Performance/business_case_for_performance\" class=\"only-in-en-us\">The business case for web performance</a></li></ol></details></li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Extensions/Testing\">Testing</a></summary><ol><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Testing/Introduction\" class=\"only-in-en-us\">Introduction to cross-browser testing</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Testing/Testing_strategies\" class=\"only-in-en-us\">Strategies for carrying out testing</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Testing/HTML_and_CSS\" class=\"only-in-en-us\">Handling common HTML and CSS problems</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Testing/Feature_detection\" class=\"only-in-en-us\">Implementing feature detection</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Testing/Automated_testing\" class=\"only-in-en-us\">Introduction to automated testing</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Testing/Your_own_automation_environment\" class=\"only-in-en-us\">Setting up your own test automation environment</a></li></ol></details></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Transform_animate\" class=\"only-in-en-us\">Transform and animate CSS</a></li><li><a href=\"/en-US/docs/Learn_web_development/Extensions/Security_privacy\" class=\"only-in-en-us\">Security and privacy</a></li><li class=\"section\">Further resources</li><li class=\"toggle\"><details><summary><a href=\"/es/docs/Learn_web_development/Howto\">How to solve common problems</a></summary><ol><li><a href=\"/es/docs/Learn_web_development/Howto/Solve_HTML_problems\">Solución de problemas comunes de HTML</a></li><li><a href=\"/es/docs/Learn_web_development/Howto/Solve_CSS_problems\">Usa CSS para resolver problemas comunes</a></li><li><a href=\"/es/docs/Learn_web_development/Howto/Solve_JavaScript_problems\">Resuelva problemas comunes en su código JavaScript</a></li><li><a href=\"/en-US/docs/Learn_web_development/Howto/Web_mechanics\" class=\"only-in-en-us\">Web mechanics</a></li><li><a href=\"/en-US/docs/Learn_web_development/Howto/Tools_and_setup\" class=\"only-in-en-us\">Tools and setup</a></li><li><a href=\"/en-US/docs/Learn_web_development/Howto/Design_and_accessibility\" class=\"only-in-en-us\">Design and accessibility</a></li></ol></details></li><li><a href=\"/en-US/docs/Learn_web_development/About\" class=\"only-in-en-us\">About</a></li><li><a href=\"/en-US/docs/Learn_web_development/Educators\" class=\"only-in-en-us\">Resources for educators</a></li><li><a href=\"/en-US/docs/Learn_web_development/Changelog\" class=\"only-in-en-us\">Changelog</a></li></ol>","source":{"folder":"es/learn_web_development/core/scripting","github_url":"https://github.com/mdn/translated-content/blob/main/files/es/learn_web_development/core/scripting/index.md","last_commit_url":"https://github.com/mdn/translated-content/commit/82f53f6ffe2654ab442fb8d4ceaee4211ca90f7f","filename":"index.md"},"summary":"En este módulo, continuamos nuestra cobertura de todas las características clave de JavaScript, tornando nuestra atención a tipos de código comúnmente encontrados tales como enunciados condicionales, bucles (loops), funciones, y eventos. Ya has visto estas cosas en este curso, pero solo de pasada aquí lo hablaremos mas explícitamente.","title":"Elementos básicos de JavaScript","toc":[{"text":"Pre-requisitos","id":"pre-requisitos"},{"text":"Guías","id":"guías"},{"text":"Evaluaciones","id":"evaluaciones"},{"text":"Ver también","id":"ver_también"}],"pageType":"learn-module"}}</script></body></html>