Node.js 20.0 er blevet frigivet, en platform til at k\u00f8re netv\u00e6rksapplikationer skrevet i JavaScript. Node.js 20.0 er blevet inkluderet i de langsigtede underst\u00f8ttelsesgrene, men denne status vil f\u00f8rst blive tildelt i oktober efter stabilisering. Underst\u00f8ttelsen af Node.js 20.x vil vare indtil 30. april 2026. Underst\u00f8ttelsen af den tidligere LTS-gren Node.js 18.x vil vare indtil april 2025, mens den for den forrige LTS-gren 16.x varer indtil september 2023. Underst\u00f8ttelsen af LTS-grenen 14.x afsluttes 30. april, og for den midlertidige gren Node.js 19.x den 1. juni. <\/p>\n
Hovedforbedringer: <\/p>\n
For at kontrollere adgangen anbefales det at bruge metoden process.permission.has(), for eksempel 'process.permission.has(‘fs.write’, » \/tmp\/test »)'. <\/p>\n
Node.js-platformen kan bruges til b\u00e5de server-side drift af webapplikationer og til at skabe almindelige klient- og serverbaserede netv\u00e6rksprogrammer. Der er forberedt en stor samling af moduler til at udvide funktionaliteten af applikationer til Node.js, hvor man kan finde moduler med implementeringer servere<\/a> og HTTP, SMTP, XMPP, DNS, FTP, IMAP, POP3 klienter, moduler til integration med forskellige web-rammer, WebSocket- og Ajax-h\u00e5ndterere, forbindelser til DBMS (MySQL, PostgreSQL, SQLite, MongoDB), templating-motorer, CSS-motorer, implementeringer af kryptografi-algoritmer og autorisationssystemer (OAuth), XML-parsere. <\/p>\n For the handling of a large number of parallel requests, Node.js utilizes an asynchronous code execution model based on event-driven, non-blocking I\/O and the definition of callback handlers. It supports multiplexing methods such as epoll, kqueue, \/dev\/poll, and select. The libuv library, which acts as a wrapper over libev in Unix systems and IOCP in Windows, is used for connection multiplexing. A thread pool is created using the libeio library, and for performing non-blocking DNS queries, c-ares is integrated. All blocking system calls are executed within the thread pool and then, similar to signal handlers, relay their results back via an unnamed pipe. JavaScript code execution is facilitated through the V8 engine developed by Google (Microsoft also develops a Node.js variant with the Chakra-Core engine). <\/p>\n I sin essence ligner Node.js p\u00e5 Perl AnyEvent, Ruby Event Machine, Python Twisted og implementeringen af events i Tcl, men begivenhedscyklen (event loop) i Node.js er skjult for udvikleren og minder om h\u00e5ndteringen af events i en webapplikation, der k\u00f8rer i en browser. N\u00e5r man skriver applikationer til Node.js, skal man tage h\u00f8jde for s\u00e6regenhederne ved begivenhedsorienteret programmering; for eksempel, i stedet for at udf\u00f8re 'var result = db.query('select..');' med ventetid p\u00e5 afslutningen og efterf\u00f8lgende behandling af resultaterne, anvender Node.js princippet for asynkron udf\u00f8relse, dvs. koden transformeres til 'db.query('select..', function (result) {behandling af resultat});', hvor kontrol straks overg\u00e5r til den videre kode, og resultatet af foresp\u00f8rgslen behandles, efterh\u00e5nden som dataene kommer ind. \u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 Node.js 20.0, \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 JavaScript. Node.js 20.0 \u043e\u0442\u043d\u0435\u0441\u0451\u043d \u043a \u0432\u0435\u0442\u043a\u0430\u043c \u0441 \u0434\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u0441\u0440\u043e\u043a\u043e\u043c \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438, \u043d\u043e \u0434\u0430\u043d\u043d\u044b\u0439 \u0441\u0442\u0430\u0442\u0443\u0441 \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u043e\u043a\u0442\u044f\u0431\u0440\u0435, \u043f\u043e\u0441\u043b\u0435 \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u0441\u0442\u0430\u0431\u0438\u043b\u0438\u0437\u0430\u0446\u0438\u0438. \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 Node.js 20.x \u0431\u0443\u0434\u0435\u0442 \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0442\u044c\u0441\u044f \u0434\u043e 30 \u0430\u043f\u0440\u0435\u043b\u044f 2026 \u0433\u043e\u0434\u0430. \u0421\u043e\u043f\u0440\u043e\u0432\u043e\u0436\u0434\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 LTS-\u0432\u0435\u0442\u043a\u0438 Node.js 18.x \u043f\u0440\u043e\u0434\u043b\u0438\u0442\u0441\u044f \u0434\u043e \u0430\u043f\u0440\u0435\u043b\u044f 2025 \u0433\u043e\u0434\u0430, \u0430 \u043f\u043e\u0437\u0430\u043f\u0440\u043e\u0448\u043b\u043e\u0439 LTS-\u0432\u0435\u0442\u043a\u0438 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Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"