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que es javascript

by Mr. Denis Leuschke IV Published 3 years ago Updated 2 years ago

What is JavaScript meaning?

JavaScript is a programming language commonly used in web development. JavaScript is a client-side scripting language, which means the source code is processed by the client's web browser rather than on the web server. ...08-Aug-2014

What is JavaScript and why it is used?

JavaScript is a text-based programming language used both on the client-side and server-side that allows you to make web pages interactive. Where HTML and CSS are languages that give structure and style to web pages, JavaScript gives web pages interactive elements that engage a user.26-Aug-2021

What is JavaScript with example?

JavaScript is a dynamic programming language that's used for web development, in web applications, for game development, and lots more. It allows you to implement dynamic features on web pages that cannot be done with only HTML and CSS.29-Mar-2021

What is difference between Java and JavaScript?

Each language requires different plug-ins. JavaScript code is run on a browser only, while Java creates applications that run in a virtual machine or browser. Java is an OOP (object-oriented programming) language, and JavaScript is specifically an OOP scripting language.

How does JavaScript work with HTML?

Here's how it works. HTML tags create objects; JavaScript lets you manipulate those objects. For example, you use the HTML and tags to create a Web page, or document. As shown in Table 1, after that document is created, you can interact with it by using JavaScript.26-Mar-2016

Why is it important to learn JavaScript?

The most obvious reason for learning JavaScript is if you have hopes of becoming a web developer. Even if you haven't got your heart set on a tech career, being proficient in this language will enable you to build websites from scratch—a pretty useful skill to have in today's job market!27-Dec-2021

Is JavaScript a language?

JavaScript (often shortened to JS) is a lightweight, interpreted, object-oriented language with first-class functions, and is best known as the scripting language for Web pages, but it's used in many non-browser environments as well.26-Jul-2021

Who uses JavaScript?

There are over 1.6 billion web sites in the world, and JavaScript is used on 95% of them (1.52 billion web sites with JavaScript). By virtue of this fact, virtually every computing device in use today runs JavaScript, including iPhones, Android phones, Apple Mac OS, Microsoft Windows, Linux, smart TVs, etc.10-May-2019

How do I write JavaScript code?

To write a JavaScript, you need a web browser and either a text editor or an HTML editor. Once you have the software in place, you can begin writing JavaScript code. To add JavaScript code to an HTML file, create or open an HTML file with your text/HTML editor.31-Aug-2020

Can I learn JavaScript without Java?

You do not need to know Java to learn JavaScript. Despite their names, the two languages have very little in common and are used for completely different areas of development. You can learn either language first but learning Java is not a prerequisite to picking up JavaScript.25-Sept-2021

Why is it called JavaScript?

The name JavaScript came from Netscape's support of Java applets within its browser. Many say it was also a marketing tactic to divert some attention from Java, which was the most buzzed-about language at the time. To run Java programs, the code must be first compiled into an executable form.19-Aug-2019

Is JavaScript easy to learn?

JavaScript is a simple and easy-to-learn programming language as compared to other languages such as C++, Ruby, and Python. It is a high-level, interpreted language that can easily be embedded with languages like HTML. It was developed by Netscape Communications Corporation, Mozilla Foundation, and ECMA International.18-Oct-2018

Información general

Uso en páginas web

El uso más común de JavaScript es escribir funciones embebidas o incluidas en páginas HTML y que interactúan con el Document Object Model (DOM o Modelo de Objetos del Documento) de la página. Algunos ejemplos sencillos de este uso son:
• Cargar nuevo contenido para la página o enviar datos al servidor a través de AJAX sin necesidad de recargar la página (por ejemplo, una red social puede permitir al usuario enviar actualizacion…

Historia

JavaScript fue desarrollado originalmente por Brendan Eich de Netscape con el nombre de Mocha, el cual fue renombrado posteriormente a LiveScript, para finalmente quedar como JavaScript. El cambio de nombre coincidió aproximadamente con el momento en que Netscape agregó compatibilidad con la tecnología Java en su navegador web Netscape Navigatoren la versión 2002 en diciembre de 1995. La denominación produjo confusión, dando la impresión de que el l…

Características

Las siguientes características son comunes a todas las implementaciones que se ajustan al estándar ECMAScript, a menos que especifique explícitamente en caso contrario.
JavaScript es compatible con gran parte de la estructura de programación de C (por ejemplo, sentencias if, bucles for, sentencias switch, etc.). Con una salvedad, en parte: en C, el ámbito de las variablesalcanza al bloque en el cual fueron definidas; sin embargo JavaScript no es compatibl…

Sintaxis y semántica

la última versión del lenguaje es ECMAScript 2016 publicada el 17 de junio de 2016. ​
Las variables en JavaScript se definen usando la palabra clave var: ​
A considerar los comentarios en el ejemplo de arriba, los cuales van precedidos con 2 barras diagonales.
No existen funcionalidades para I/Oincluidas en el lenguaje; el entorno de ejecución ya lo propor…

Seguridad

JavaScript y el DOM permite que existan programadores que hagan un uso inapropiado para introducir scripts que ejecuten código con contenido malicioso sin el consentimiento del usuario y que pueda así comprometer su seguridad.
Los desarrolladores de los navegadores tienen en cuenta este riesgo utilizando dos restricciones. En primer lugar, los scripts se ejecutan en un sandboxen el que sólo se pueden llevar a cabo acci…

Herramientas de desarrollo

En JavaScript, disponer de un depurador se convierte en necesario cuando se desarrollan grandes aplicaciones, no triviales. Dado que puede haber diferencias de implementación entre los diferentes navegadores (especialmente en cuanto al DOM), es útil tener acceso a un depurador para cada uno de los navegadores a los cuales nuestra aplicación web irá dirigido. ​
Los depuradores web están disponibles para Internet Explorer, Firefox, Safari, Google Chrome y …

Véase también

• VBScript
• AJAX
• Aplicación web
• Document Object Model
• jQuery

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