Novedades en JavaScript

This is an archived page. It's not actively maintained.

Este cap铆tulo contiene informaci贸n del historial de versiones de JavaScript y su estatus de implementaci贸n en aplicaciones basadas en聽JavaScript de Mozilla/SpiderMonkey (como Firefox)

Versiones ECMAScript

Recursos del Lenguaje
Aprende m谩s acerca de los est谩ndares ECMAscript en los que el lenguaje JavaScript est谩 basado.
Soporte ECMAScript 5
Estatus de la implementaci贸n del estandar聽actual聽ECMA-262 (Edici贸n 5.1) en aquellos聽productos y sistemas聽basados en Mozilla.
Soporte ECMAScript 6
Estatus de la implementaci贸n del聽estandar聽en proceso de incorporaci贸n聽ECMA-262 (Edici贸n 6) en aquellos聽productos y sistemas聽basados en Mozilla.
Soporte ECMAScript 7
Estatus de la implementaci贸n del聽estandar聽pr贸ximo聽ECMA-262 (Edici贸n 7) en aquellos聽productos y sistemas聽basados en Mozilla.

Notas de Lanzamiento de JavaScript

Bit谩cora de cambios (changelog) de JavaScript en Firefox
Vea esta bit谩cora de cambios (changelog) para mayor informaci贸n de las caracter铆sticas y funcionalidades implementadas a partir de Firefox 5.
Bit谩cora de Cambios (Changelog) de JavaScript en Chrome
(PENDIENTE) Vea esta bit谩cora de cambios (changelog) para mayor informaci贸n de las caracter铆sticas y funcionalidades implementadas en Chrome.

Versiones JavaScript

Deprecated ( ). The explicit versioning and opt-in of language features was Mozilla-specific and is in process of being removed. Firefox 4 was the last version which referred to an JavaScript version (1.8.5). With new ECMA standards, JavaScript language features are now often mentioned with their initial definition in ECMA-262 Editions such as Edition 6 (ES6).

JavaScript was released as version 1.0 in March 1996 in Netscape Navigator 2.0 and Internet Explorer 2.0.

JavaScript 1.1
Version shipped in Netscape Navigator 3.0. Released on August 19, 1996.
JavaScript 1.2
Version shipped in Netscape Navigator 4.0-4.05. Released on June 11, 1997.
JavaScript 1.3
Version shipped in Netscape Navigator 4.06-4.7x. Released on October 19, 1998.
Standardization work to be compliant with ECMA-262 1st and 2nd Edition.
JavaScript 1.4
Version shipped in Netscape's server side JavaScript. Released in 1999.
JavaScript 1.5
Version shipped in Netscape Navigator 6.0 and Firefox 1.0. Release on November 14, 2000.
Standardization work to be compliant with ECMA-262 3rd Edition.
JavaScript 1.6
Version shipped in Firefox 1.5. Released in November 2005.
Includes ECMAScript for XML (E4X), new Array methods plus String and Array generics.
JavaScript 1.7
Version shipped in Firefox 2. Released in October 2006.
Includes generators, iterators, array comprehensions, let expressions, and destructuring assignment.
JavaScript 1.8
Version shipped in Firefox 3. Released in June 2008.
Includes expression closures, generator expressions and Array.reduce()
JavaScript 1.8.1
Version shipped in Firefox 3.5. Released on June 30, 2009.
Includes the TraceMonkey JIT and supports native JSON.
JavaScript 1.8.2
Version shipped in Firefox 3.6. Released June 22, 2009.
Includes only minor changes.
JavaScript 1.8.5
Version shipped in Firefox 4. Released July 27, 2010.
Includes many new features for ECMA-262 Edition 5 compliance.
This is the last JavaScript version.

Features still requiring version opt-in

let statement
The let statement requires the JavaScript version 1.7 (or higher) opt-in. See error聽932517 and error聽932517.