{"id":95775,"date":"2022-07-25T15:52:17","date_gmt":"2022-07-25T13:52:17","guid":{"rendered":"https:\/\/rmarketingdigital.com\/javascript\/todo-lo-que-necesitas-saber-de-nodejs\/"},"modified":"2020-12-08T09:16:32","modified_gmt":"2020-12-08T12:16:32","slug":"todo-lo-que-necesitas-saber-de-nodejs","status":"publish","type":"post","link":"https:\/\/rmarketingdigital.com\/de\/javascript\/todo-lo-que-necesitas-saber-de-nodejs\/","title":{"rendered":"Alles, was Sie \u00fcber Nodejs wissen m\u00fcssen"},"content":{"rendered":"<div itemprop=\"articleBody\">\n<p><span style=\"font-weight: 400;\"><strong>Nodejs<\/strong> es un incre\u00edble herramienta que nos permite usar<strong> javascript m\u00e1s all\u00e1 del navegador.<\/strong><\/span><\/p>\n<blockquote>\n<p><strong>\u2013 A qu\u00e9 te refieres con eso?<\/strong><\/p>\n<\/blockquote>\n<p><span style=\"font-weight: 400;\">Seg\u00fan su web oficial Nodejs es:<\/span><\/p>\n<blockquote>\n<p style=\"text-align: left;\"><strong>\u201ces un entorno de ejecuci\u00f3n para JavaScript construido con el motor de JavaScript V8 de Chrome.\u201d<\/strong><\/p>\n<p><strong>Seguro te preguntaras algo como\u2026 Y que quiere decir esto?<\/strong><\/p>\n<\/blockquote>\n<p><span style=\"font-weight: 400;\">Bueno veras, <strong>en el pasado javascript no era ni tan genial<\/strong>, ni tan abierto como lo es ahora. Javascript en su concepci\u00f3n fue<strong> desarrollado originalmente por <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/es.wikipedia.org\/wiki\/Brendan_Eich\">Brendan Eich<\/a> para netScape<\/strong> y estaba estrictamente ligado a los navegadores(browsers).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">No fue sino hasta <strong>2009<\/strong> despu\u00e9s de que Google dio al mundo su navegador Google Chrome que liber\u00f3 a javascript de su prisi\u00f3n web gracias a su motor de JavaScript V8.<\/span><\/p>\n<blockquote>\n<p><strong>\u2013 Y que es el motor V8? (suena a bebida energ\u00e9tica)<\/strong><\/p>\n<\/blockquote>\n<p><span style=\"font-weight: 400;\">El motor es el software que <strong>interpreta el c\u00f3digo JavaScript<\/strong> y que a su vez, ejecuta un script acorde a las instrucciones dadas. Todos los navegadores web tienen un <strong>motor de JavaScript<\/strong>, Safari usa <strong>JavaScriptCore<\/strong><\/span><span style=\"font-weight: 400;\">, FireFox usa <strong>SpiderMonkey<\/strong>, Microsoft Edge usa <strong>Chakra<\/strong> y en este caso <\/span><span style=\"font-weight: 400;\">Google Chrome con\u00a0<strong>V8<\/strong>, que tambi\u00e9n es en parte el motor de <strong>Nodejs<\/strong>.<\/span><\/p>\n<h6 style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" style=\"-webkit-user-select: none; cursor: zoom-in;\" src=\"https:\/\/rmarketingdigital.com\/wp-content\/uploads\/2020\/12\/JavaScript-Engine-1.gif\" width=\"611\" height=\"344\"\/>Recurso de <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/www.rainerhahnekamp.com\">Rainer hahnekamp<\/a><\/h6>\n<p><span style=\"font-weight: 400;\">El lanzamiento del <strong>V8<\/strong> marc\u00f3 un momento crucial en la historia de los motores. <strong>V8<\/strong> reemplaz\u00f3 la relativamente lenta interpretaci\u00f3n de JavaScript del navegador.<\/span><span style=\"font-weight: 400;\"><br \/><\/span><span style=\"font-weight: 400;\"><br \/><\/span><span style=\"font-weight: 400;\">La raz\u00f3n detr\u00e1s de esta mejora tan grande radica principalmente en la combinaci\u00f3n de int\u00e9rprete y compilador. Hoy en d\u00eda, los cuatro motores utilizan esta t\u00e9cnica. El int\u00e9rprete ejecuta el c\u00f3digo fuente casi de inmediato. El compilador traduce el c\u00f3digo fuente en c\u00f3digo m\u00e1quina que el sistema del usuario ejecuta de manera directa.<\/span><\/p>\n<blockquote>\n<p><strong>Tal vez \u00a0te preguntes\u2026<\/strong><\/p>\n<p><strong>\u2013 \u00a0A fin de cuentas tiene todo esto que ver con Nodejs?<\/strong><\/p>\n<\/blockquote>\n<p><span style=\"font-weight: 400;\">Bueno, la relaci\u00f3n es que un d\u00eda<strong> <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/en.wikipedia.org\/wiki\/Ryan_Dahl\">Ryah Dahll<\/a>, el creador de Nodejs<\/strong>, buscando una manera de crear servidores web que consideren las necesidades de la web actual, es decir una enorme cantidad de usuarios y todos accediendo en tiempo ral, encontr\u00f3 el<strong> motor V8 de google<\/strong> y lo hizo funcionar <strong>fuera del navegador<\/strong>, es decir en el sistema operativo, y desde este momento, nace <strong>Nodejs<\/strong>. y El cual lo presenta en la <strong>JsConf<\/strong>, una conferencia de Javascript.<\/span><\/p>\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" title=\"Ryan Dahl: Original Node.js presentation\" width=\"1080\" height=\"608\" src=\"https:\/\/www.youtube.com\/embed\/ztspvPYybIY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">Nodejs es especial porque seg\u00fan su web oficial:<\/span><\/p>\n<blockquote>\n<p><strong>\u201cutiliza un modelo de I\/O dirigida a eventos no bloqueantes que hace que sea ligero y eficiente, ideal para aplicaciones en tiempo real con intenso intercambio de datos a trav\u00e9s de dispositivos distribuidos\u201d<\/strong><\/p>\n<\/blockquote>\n<p><span style=\"font-weight: 400;\">Como ver\u00e1s no es un concepto nada simple, m\u00e1s a\u00fan si est\u00e1s empezando, as\u00ed que empezar\u00e9 detallando que es Nodejs:<\/span><\/p>\n<blockquote>\n<p><strong>Nodejs Es un entorno de ejecuci\u00f3n de javascript que est\u00e1 construido con el motor v8 de google chrome que es un modelo de operaciones sin bloqueo y orientado a eventos.<\/strong><\/p>\n<\/blockquote>\n<p><span style=\"font-weight: 400;\">bueno esto tampoco ayuda mucho, pero perm\u00edteme explicarte a partir de este enunciado.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><strong>Nodejs<\/strong> se basa en el<strong> motor V8 que Google cre\u00f3 para interpretar javascript en Chrome<\/strong>, \u00a0Aprovechando este motor\u00a0<\/span><strong>Nodejs,<\/strong> compila el c\u00f3digo <strong>JavaScript a lenguaje nativo,<\/strong> adem\u00e1s de tener una gran velocidad de ejecuci\u00f3n, la simplicidad de la interfaz que <strong>Nodejs<\/strong> nos provee es tan incre\u00edble, que iniciar un servidor nos lleva menos de 20 l\u00edneas de c\u00f3digo, por ejemplo:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"js\">\/\/ Se carga el m\u00f3dulo de HTTP&#13;\nvar http = require(\"http\");&#13;\n&#13;\n\/\/ Creaci\u00f3n del servidor HTTP, y se define la escucha&#13;\n\/\/ de peticiones en el puerto 8000&#13;\nhttp.createServer(function(request, response) {&#13;\n&#13;\n   \/\/ Se define la cabecera HTTP, con el estado HTTP (OK: 200) y el tipo de contenido&#13;\n   response.writeHead(200, {'Content-Type': 'text\/plain'});&#13;\n   &#13;\n   \/\/ Se responde, en el cuerpo de la respuesta con el mensaje \"Hello World\"&#13;\n   response.end('Hola Mundo!n');&#13;\n}).listen(8000);&#13;\n&#13;\n\/\/ Se escribe la URL para el acceso al servidor&#13;\nconsole.log('Servidor en la url http:\/\/127.0.0.1:8000\/');&#13;\n<\/pre>\n<blockquote>\n<p style=\"text-align: left;\"><strong>La particularidad de Nodejs reside en una pieza denominada EventLoop.<\/strong><\/p>\n<\/blockquote>\n<p><span style=\"font-weight: 400;\">Veras Nodejs surge como respuesta a una problem\u00e1tica con la programaci\u00f3n secuencial tradicional. En lenguajes como Java, C++ o C#, que se basan en hilos de ejecuci\u00f3n, hay un m\u00e1ximo te\u00f3rico que viene dado por la memoria que consume cada hilo de ejecuci\u00f3n en la m\u00e1quina en la que se despliega.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><strong>Nodejs<\/strong> en cambio es<strong> single thread<\/strong>(o de <strong>un solo hilo<\/strong>), este hilo de ejecuci\u00f3n \u00fanica se denomina EventLoop y su funci\u00f3n es ejecutar c\u00f3digo Javascript el cual es por naturaleza .<\/span><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-436 size-full\" src=\"https:\/\/rmarketingdigital.com\/wp-content\/uploads\/2020\/12\/node-eventloop.jpg\" alt=\"awd\" width=\"800\" height=\"450\"  \/>Recurso de <a rel=\"prettyPhoto[gallery-IcAw]\" target=\"_blank\" href=\"https:\/\/www.paradigmadigital.com\/wp-content\/uploads\/2018\/08\/node-1.jpg\">Paradigma digital<\/a><\/p>\n<p><span style=\"font-weight: 400;\">Ante la llegada de operaciones de entrada\/salida<strong>(Input\/Output)<\/strong> delega la ejecuci\u00f3n de las mismas en subsistemas espec\u00edficamente preparados para que se procesen en segundo plano.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">De esta forma no se bloquea el hilo de ejecuci\u00f3n<strong> (non-blocking),<\/strong> mientras el EventLoop apunta la funci\u00f3n que se ejecutar\u00e1 una vez que ese procesamiento offline termine <strong>(callback).<\/strong><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Una forma sencilla de entender qu\u00e9 es el <strong>EventLoop<\/strong> es imaginar que el sistema es como un restaurante, en el que tenemos un \u00fanico trabajador: un camarero. Nuestro camarero se encarga de sentar a la gente en la mesa y tomarles la orden de comida <strong>(tarea as\u00edncrona)<\/strong>, si el camarero tuviese que preparar la comida estar\u00edamos bloque\u00e1ndole para que pudiese atender a la siguiente mesa.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">En lugar de eso, el camarero manda la orden a la cocina<strong> (threadPool)<\/strong>, en la que uno de los cocineros la prepara. Cuando la comida est\u00e9 lista, llamar\u00e1 al camarero para que la lleve a la mesa, nuestro camarero tendr\u00e1 apuntada la correspondencia entra la comida y el n\u00famero de mesa para saber el sitio al que tiene entregar la comida <strong>(callback).<\/strong><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Espero que esta introducci\u00f3n haya sido suficiente para causar inter\u00e9s en aprender m\u00e1s sobre <strong>Nodejs<\/strong>. Para obtener m\u00e1s informaci\u00f3n y ejemplos de aplicaciones en esta plataforma pueden visitar la documentaci\u00f3n oficial de <strong>Nodejs<\/strong>.<\/span><\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Nodejs es un incre\u00edble herramienta que nos permite usar javascript m\u00e1s all\u00e1 del navegador. \u2013 A qu\u00e9 te refieres con eso? Seg\u00fan su web oficial Nodejs es: \u201ces un entorno&#8230;<\/p>","protected":false},"author":1,"featured_media":95777,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1374],"tags":[1434,1437,1430],"class_list":["post-95775","post","type-post","status-publish","format-standard","has-post-thumbnail","category-javascript","tag-chrome","tag-edge","tag-youtube"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Todo lo que necesitas saber de Nodejs - R Marketing Digital<\/title>\n<meta name=\"description\" content=\"Nodejs es un incre\u00edble herramienta que nos permite usar javascript m\u00e1s all\u00e1 del navegador. \u2013 A qu\u00e9 te refieres con eso? 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