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HTTP/2 302 server: nginx date: Fri, 16 Jan 2026 23:49:22 GMT content-type: text/plain; charset=utf-8 content-length: 0 x-archive-redirect-reason: found capture at 20090927081731 location: https://web.archive.org/web/20090927081731/https://developer.mozilla.org/en/docs/JavaScript server-timing: captures_list;dur=0.692895, exclusion.robots;dur=0.047073, exclusion.robots.policy;dur=0.035827, esindex;dur=0.011534, cdx.remote;dur=122.758760, LoadShardBlock;dur=175.764592, PetaboxLoader3.resolve;dur=37.527436, PetaboxLoader3.datanode;dur=57.075450 x-app-server: wwwb-app223-dc8 x-ts: 302 x-tr: 328 server-timing: TR;dur=0,Tw;dur=0,Tc;dur=1 set-cookie: wb-p-SERVER=wwwb-app223; path=/ x-location: All x-as: 14061 x-rl: 0 x-na: 0 x-page-cache: MISS server-timing: MISS x-nid: DigitalOcean referrer-policy: no-referrer-when-downgrade permissions-policy: interest-cohort=() HTTP/2 302 server: nginx date: Fri, 16 Jan 2026 23:49:25 GMT content-type: text/plain; charset=utf-8 content-length: 0 x-archive-redirect-reason: found capture at 20081024011838 location: https://web.archive.org/web/20081024011838/https://developer.mozilla.org/en/docs/JavaScript server-timing: captures_list;dur=0.570500, exclusion.robots;dur=0.019722, exclusion.robots.policy;dur=0.008721, esindex;dur=0.010194, cdx.remote;dur=132.657300, LoadShardBlock;dur=90.443809, PetaboxLoader3.datanode;dur=543.779084, PetaboxLoader3.resolve;dur=1397.205902, load_resource;dur=2136.330289 x-app-server: wwwb-app223-dc8 x-ts: 302 x-tr: 2406 server-timing: TR;dur=0,Tw;dur=0,Tc;dur=0 x-location: All x-as: 14061 x-rl: 0 x-na: 0 x-page-cache: MISS server-timing: MISS x-nid: DigitalOcean referrer-policy: no-referrer-when-downgrade permissions-policy: interest-cohort=() HTTP/2 302 server: nginx date: Fri, 16 Jan 2026 23:49:25 GMT content-type: text/html; charset=iso-8859-1 content-length: 313 x-archive-orig-date: Fri, 24 Oct 2008 02:24:24 GMT x-archive-orig-server: Apache/2.2.3 (Red Hat) location: https://web.archive.org/web/20081024011838/https://developer.mozilla.org/en/JavaScript x-archive-orig-content-length: 313 x-archive-orig-keep-alive: timeout=15, max=64 x-archive-orig-connection: Keep-Alive cache-control: max-age=1800 memento-datetime: Fri, 24 Oct 2008 01:18:38 GMT link: ; rel="original", ; rel="timemap"; type="application/link-format", ; rel="timegate" content-security-policy: default-src 'self' 'unsafe-eval' 'unsafe-inline' data: blob: archive.org web.archive.org web-static.archive.org wayback-api.archive.org athena.archive.org analytics.archive.org pragma.archivelab.org wwwb-events.archive.org x-archive-src: portuguese-web-archive-AWP32008-108/IAH-20081024005554-11790-T1.arc.gz server-timing: captures_list;dur=0.648588, exclusion.robots;dur=0.021220, exclusion.robots.policy;dur=0.009679, esindex;dur=0.010479, cdx.remote;dur=10.433725, LoadShardBlock;dur=121.148603, PetaboxLoader3.datanode;dur=81.593241, PetaboxLoader3.resolve;dur=55.640553, load_resource;dur=54.720643 x-app-server: wwwb-app223-dc8 x-ts: 302 x-tr: 226 server-timing: TR;dur=0,Tw;dur=0,Tc;dur=0 x-location: All x-as: 14061 x-rl: 0 x-na: 0 x-page-cache: MISS server-timing: MISS x-nid: DigitalOcean referrer-policy: no-referrer-when-downgrade permissions-policy: interest-cohort=() HTTP/2 302 server: nginx date: Fri, 16 Jan 2026 23:49:26 GMT content-type: text/plain; charset=utf-8 content-length: 0 x-archive-redirect-reason: found capture at 20081024134604 location: https://web.archive.org/web/20081024134604/https://developer.mozilla.org/En/JavaScript server-timing: captures_list;dur=0.679234, exclusion.robots;dur=0.018197, exclusion.robots.policy;dur=0.008301, esindex;dur=0.011821, cdx.remote;dur=45.857233, LoadShardBlock;dur=235.860995, PetaboxLoader3.datanode;dur=134.567336, PetaboxLoader3.resolve;dur=47.226222 x-app-server: wwwb-app223-dc8 x-ts: 302 x-tr: 346 server-timing: TR;dur=0,Tw;dur=0,Tc;dur=0 x-location: All x-as: 14061 x-rl: 0 x-na: 0 x-page-cache: MISS server-timing: MISS x-nid: DigitalOcean referrer-policy: no-referrer-when-downgrade permissions-policy: interest-cohort=() HTTP/2 302 server: nginx date: Fri, 16 Jan 2026 23:49:28 GMT content-type: text/plain; charset=utf-8 content-length: 0 x-archive-redirect-reason: found capture at 20081020000545 location: https://web.archive.org/web/20081020000545/https://developer.mozilla.org/en/JavaScript server-timing: captures_list;dur=0.946666, exclusion.robots;dur=0.026324, exclusion.robots.policy;dur=0.012385, esindex;dur=0.015209, cdx.remote;dur=21.562248, LoadShardBlock;dur=946.665934, PetaboxLoader3.datanode;dur=1022.393151, PetaboxLoader3.resolve;dur=325.389891, load_resource;dur=580.688288 x-app-server: wwwb-app223-dc8 x-ts: 302 x-tr: 1614 server-timing: TR;dur=0,Tw;dur=0,Tc;dur=0 x-location: All x-as: 14061 x-rl: 0 x-na: 0 x-page-cache: MISS server-timing: MISS x-nid: DigitalOcean referrer-policy: no-referrer-when-downgrade permissions-policy: interest-cohort=() HTTP/2 200 server: nginx date: Fri, 16 Jan 2026 23:49:28 GMT content-type: text/html; charset=utf-8 x-archive-orig-date: Mon, 20 Oct 2008 00:05:45 GMT x-archive-orig-server: Apache/2.2.3 (Red Hat) x-archive-orig-x-powered-by: PHP/5.1.6 x-archive-orig-p3p: CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT" x-archive-orig-content-language: en-us x-archive-orig-vary: Accept-Encoding,Cookie x-archive-orig-expires: -1 x-archive-orig-cache-control: private, must-revalidate, max-age=0 x-archive-orig-connection: close x-archive-guessed-content-type: text/html x-archive-guessed-charset: utf-8 memento-datetime: Mon, 20 Oct 2008 00:05:45 GMT link: ; rel="original", ; rel="timemap"; type="application/link-format", ; rel="timegate" content-security-policy: default-src 'self' 'unsafe-eval' 'unsafe-inline' data: blob: archive.org web.archive.org web-static.archive.org wayback-api.archive.org athena.archive.org analytics.archive.org pragma.archivelab.org wwwb-events.archive.org x-archive-src: 51_6_20081019210719_crawl108-c/51_6_20081020000431_crawl100.arc.gz server-timing: captures_list;dur=0.909272, exclusion.robots;dur=0.023898, exclusion.robots.policy;dur=0.010538, esindex;dur=0.017333, cdx.remote;dur=12.984170, LoadShardBlock;dur=135.900868, PetaboxLoader3.datanode;dur=146.497839, PetaboxLoader3.resolve;dur=70.365764, load_resource;dur=88.963982 x-app-server: wwwb-app223-dc8 x-ts: 200 x-tr: 342 server-timing: TR;dur=0,Tw;dur=0,Tc;dur=1 x-location: All x-as: 14061 x-rl: 0 x-na: 0 x-page-cache: MISS server-timing: MISS x-nid: DigitalOcean referrer-policy: no-referrer-when-downgrade permissions-policy: interest-cohort=() content-encoding: gzip JavaScript - MDC

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JavaScript

A re-introduction to JavaScript

JavaScript is a small, lightweight, object-oriented, cross-platform scripting language. For a brief introduction, read About JavaScript.

For information about using JavaScript in browsers, please see DOM and DHTML topics. The Gecko DOM Reference describes the host objects available in Gecko-based browsers.

For information about embedding JavaScript engine in your application, see SpiderMonkey.

Documentation

Core JavaScript Reference: This JavaScript reference includes complete documentation for JavaScript 1.5 and updates.

Core JavaScript Guide: Our primary guide about how to program with JavaScript.

New in JavaScript 1.6: Describes new features of JavaScript 1.6, a new version of JavaScript supported by Firefox 1.5 and other Mozilla 1.8-based applications.

New in JavaScript 1.7: Describes new features of JavaScript 1.7, a new version of JavaScript supported in Firefox 2.

New in JavaScript 1.8: Describes new features of JavaScript 1.8, the latest version, supported in Firefox 3.

Migrate apps from Internet Explorer to Mozilla: Doron Rosenberg tells you how to make sure your web applications work in both IE and Mozilla.

JavaScript Language Resources: A description of the JavaScript language standards.

JScript Deviations from ES3 (PDF): Describes differences between the ECMAScript ed. 3 standard and its Microsoft implementation (JScript). Also includes information on other browsers (Opera, Firefox, and Safari).

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