{"id":111020,"date":"2023-10-21T15:10:15","date_gmt":"2023-10-21T13:10:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dostupna-servernaya-javascript-platforma-node-js-21-0"},"modified":"2026-02-15T22:30:51","modified_gmt":"2026-02-15T20:30:51","slug":"dostupna-servernaya-javascript-platforma-node-js-21-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/dostupna-servernaya-javascript-platforma-node-js-21-0","title":{"rendered":"Piattaforma server JavaScript Node.js 21.0 disponibile","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stato rilasciato Node.js 21.0, una piattaforma per l'esecuzione di applicazioni di rete in JavaScript. Il supporto per la versione Node.js 21.0 sar\u00e0 fornito per sei mesi. Nei prossimi giorni si completer\u00e0 la stabilizzazione della versione Node.js 20, che otterr\u00e0 lo status di LTS e sar\u00e0 supportata fino ad aprile 2026. Il supporto per la precedente versione LTS Node.js 18.0 continuer\u00e0 fino a settembre 2025, mentre per la versione LTS ancora precedente 16.0 fino ad aprile 2024.         <\/p>\n<p>Miglioramenti principali:  <\/p>\n<ul>\n<li class=\"l\"> \u00c8 stato annunciato un API Fetch stabile, progettato per il caricamento delle risorse attraverso la rete e per semplificare la scrittura di codice JavaScript universale, idoneo per l'uso lato server e lato client. L'implementazione si basa sul codice del client HTTP\/1.1 'undici' ed \u00e8 massimamente simile all'API corrispondente fornita nei browser. L'API include il metodo fetch() e gli oggetti Headers, Request e Response, che rappresentano gli header HTTP, la richiesta e la risposta.           const res = await fetch('https:\/\/nodejs.org\/api\/documentation.json');     if (res.ok) {       const data = await res.json();       console.log(data);     }\n<li class=\"l\"> \u00c8 stata stabilizzata la compatibilit\u00e0 con l'API WebStreams, che fornisce accesso ai flussi di dati provenienti dalla rete. L'API consente di aggiungere gestori personalizzati che lavorano con i dati man mano che vengono ricevuti, senza attendere il caricamento di tutto il file. In Node.js sono disponibili oggetti come ReadableStream*, TransformStream*, WritableStream*, TextEncoderStream, TextDecoderStream, CompressionStream e DecompressionStream.\n<li class=\"l\"> \u00c8 stata aggiunta un'implementazione sperimentale di un client WebSocket, <a href=\"https:\/\/prohoster.info\/it\/ssl-sertifikat\/rapidssl-wildcard\/\"  data-wpil-monitor-id=\"3323\">compatibile con i browser<\/a>. Per attivare il supporto ai WebSocket, \u00e8 previsto il flag '\u2014experimental-websocket'.\n<li class=\"l\"> \u00c8 stato aggiunto un modo sperimentale di utilizzo predefinito per l'implementazione dei moduli JavaScript ESM (ECMAScript Modules, utilizzato nei moduli per i browser) invece di CommonJS (specifico per Node.js). Questa modifica non influisce sui moduli il cui formato \u00e8 esplicitamente definito attraverso il campo 'type' in package.json, impostato tramite il flag '\u2014input-type' o evidente per l'estensione del file (.mjs per ESM, .cjs per CommonJS). Tuttavia, i moduli che non sono esplicitamente definiti come CommonJS (ad esempio, hanno l'estensione '.js') verranno considerati come moduli ESM con l'attivazione della nuova modalit\u00e0. Per attivare le nuove impostazioni dei moduli, \u00e8 stato proposto il flag '\u2014experimental-default-type'.\n<li class=\"l\"> Il motore V8 \u00e8 stato aggiornato alla versione 11.8, utilizzata in Chromium 118, che ora comprende il supporto per il metodo ArrayBuffer.prototype.transfer, la possibilit\u00e0 di raggruppare gli array (metodo groupBy) e le istruzioni di WebAssembly per il trattamento delle costanti (i32.add, i32.sub, i32.mul, i64.add, i64.sub e i64.mul).\n<li class=\"l\"> \u00c8 stata interrotta la supporto per il gestore globalPreload; da ora in poi \u00e8 possibile configurare i moduli utilizzando le chiamate register e initialize.\n<li class=\"l\"> Nella funzione fs.writeFile \u00e8 stata aggiunta l'opzione 'flush' per forzare il salvataggio dei dati sul dispositivo dopo ogni operazione di scrittura.\n<li class=\"l\"> \u00c8 stata migliorata la performance del codice relativo all'analisi degli URL, all'API fetch, ai flussi, node:fs e all'HTTP.\n<li class=\"l\"> \u00c8 stato aggiunto un oggetto globale navigator. Ad esempio, per ottenere dati sul numero di core della CPU, si pu\u00f2 utilizzare la propriet\u00e0 navigator.hardwareConcurrency.\n<li class=\"l\"> Nel parametro '\u2014test' \u00e8 stata aggiunta la supporto per le maschere glob per selezionare i test da eseguire (ad esempio, \u00e8 possibile specificare '\u2014test **\/*.test.js.').\n<li class=\"l\"> Aggiornati il gestore di pacchetti incluso npm 10.2.0 e il parser llhttp 9.1.2.\n<li class=\"l\"> \u00c8 stata interrotta la supporto per Visual Studio 2019 e le versioni di macOS precedenti alla 11.0.         <\/ul>\n<p>La piattaforma Node.js pu\u00f2 essere utilizzata sia per il supporto server delle applicazioni web, sia per creare normali programmi di rete client e server. Per espandere le funzionalit\u00e0 delle applicazioni Node.js, \u00e8 disponibile un'ampia collezione di moduli, in cui \u00e8 possibile trovare moduli con implementazioni  <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1675\">server<\/a> e client HTTP, SMTP, XMPP, DNS, FTP, IMAP, POP3, moduli per l'integrazione con vari framework web, gestori WebSocket e Ajax, connettori per database (MySQL, PostgreSQL, SQLite, MongoDB), motori di templating, motori CSS, implementazioni di algoritmi crittografici e sistemi di autorizzazione (OAuth), parser XML.    <\/p>\n<p> Per gestire un elevato numero di richieste parallele, Node.js utilizza un modello asincrono di esecuzione del codice, basato su un'architettura ad eventi in modalit\u00e0 non bloccante e sulla definizione di callback. Per il multiplexing delle connessioni, vengono supportati metodi come epoll, kqueue, \/dev\/poll e select. La libreria libuv, che funge da interfaccia sopra libev nei sistemi Unix e IOCP in Windows, viene utilizzata per il multiplexing delle connessioni. La libreria libeio \u00e8 impiegata per creare un pool di thread, mentre c-ares \u00e8 integrato per eseguire richieste DNS in modalit\u00e0 non bloccante. Tutti i syscalls bloccanti sono eseguiti all'interno del pool di thread e, come gli handler dei segnali, restituiscono i risultati delle loro operazioni tramite una pipe non nominata. L'esecuzione del codice JavaScript \u00e8 garantita dall'utilizzo del motore V8 sviluppato da Google (in aggiunta, Microsoft sviluppa una versione di Node.js con il motore Chakra-Core).        <\/p>\n<p>Node.js \u00e8 fondamentalmente simile ai framework Perl AnyEvent, Ruby Event Machine, Python Twisted e all'implementazione degli eventi in Tcl, ma il ciclo di eventi (event loop) in Node.js \u00e8 nascosto allo sviluppatore e ricorda la gestione degli eventi in un'app web che gira nel browser. Quando si scrivono applicazioni per Node.js, \u00e8 necessario considerare le caratteristiche della programmazione orientata agli eventi, ad esempio, invece di eseguire &#171;var result = db.query(&#171;select..&#187;);&#187; aspettando il completamento e successivamente elaborando i risultati, Node.js utilizza il principio dell'esecuzione asincrona, cio\u00e8 il codice viene trasformato in &#171;db.query(&#171;select..&#187;, function (result) {elaborazione del risultato});&#187;, dove il controllo passa immediatamente al codice successivo, e il risultato della query verr\u00e0 elaborato man mano che i dati arrivano.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=59969\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 Node.js 21.0, \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. \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u0432\u0435\u0442\u043a\u0438 Node.js 21.0 \u0431\u0443\u0434\u0435\u0442 \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0442\u044c\u0441\u044f \u0432 \u0442\u0435\u0447\u0435\u043d\u0438\u0435 6 \u043c\u0435\u0441\u044f\u0446\u0435\u0432. \u0412 \u0431\u043b\u0438\u0436\u0430\u0439\u0448\u0438\u0435 \u0434\u043d\u0438 \u0431\u0443\u0434\u0435\u0442 \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0430 \u0441\u0442\u0430\u0431\u0438\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0432\u0435\u0442\u043a\u0438 Node.js 20, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u0442 \u0441\u0442\u0430\u0442\u0443\u0441 LTS \u0438 \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043e \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 18.0 \u043f\u0440\u043e\u0434\u043b\u0438\u0442\u0441\u044f \u0434\u043e \u0441\u0435\u043d\u0442\u044f\u0431\u0440\u044f 2025 \u0433\u043e\u0434\u0430, \u0430 \u043f\u043e\u0437\u0430\u043f\u0440\u043e\u0448\u043b\u043e\u0439 LTS-\u0432\u0435\u0442\u043a\u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-111020","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 Node.js 21.0, \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. \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u0432\u0435\u0442\u043a\u0438 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