{"id":107956,"date":"2023-04-19T12:48:21","date_gmt":"2023-04-19T10:48:21","guid":{"rendered":"https:\/\/prohoster.info\/?p=107956"},"modified":"2023-04-19T14:43:38","modified_gmt":"2023-04-19T12:43:38","slug":"dostupna-servernaya-javascript-platforma-node-js-20-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/dostupna-servernaya-javascript-platforma-node-js-20-0","title":{"rendered":"\u00c8 disponibile la piattaforma server JavaScript Node.js 20.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stata rilasciata la versione 20.0 di Node.js, la piattaforma per l'esecuzione di applicazioni di rete in JavaScript. La versione 20.0 di Node.js \u00e8 stata classificata tra le versioni con supporto a lungo termine, ma questo status sar\u00e0 conferito solo a ottobre, dopo un periodo di stabilizzazione. Il supporto per Node.js 20.x sar\u00e0 garantito fino al 30 aprile 2026. Il supporto per la precedente versione LTS di Node.js 18.x durer\u00e0 fino ad aprile 2025, mentre per la versione LTS 16.x terminer\u00e0 a settembre 2023. Il supporto per la versione LTS 14.x verr\u00e0 interrotto il 30 aprile, e per la versione intermedia di Node.js 19.x il 1\u00b0 giugno.     <\/p>\n<p>Miglioramenti principali:  <\/p>\n<ul>\n<li class=\"l\"> Il motore V8 \u00e8 stato aggiornato alla versione 11.3, utilizzata in Chromium 113. Tra le novit\u00e0 rispetto alla versione di Node.js 19, che utilizzava il motore Chromium 107, si segnalano le funzioni String.prototype.isWellFormed e toWellFormed, i metodi Array.prototype e TypedArray.prototype per lavorare su una copia durante la modifica di oggetti Array e TypedArray, il flag \u2018v\u2019 in RegExp, il supporto per il ridimensionamento di ArrayBuffer e l'espansione di SharedArrayBuffer, e la ricorsione ottimizzata (tail-call) in WebAssembly.\n<li class=\"l\"> \u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c Permission Model, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u043c \u0440\u0435\u0441\u0443\u0440\u0441\u0430\u043c \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f.  \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 Permission Model \u0432\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f \u0447\u0435\u0440\u0435\u0437 \u0443\u043a\u0430\u0437\u0430\u043d\u0438\u0435 \u043f\u0440\u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0435 \u0444\u043b\u0430\u0433\u0430  &#171;&#8212;experimental-permission&#187;. \u0412 \u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u044b \u043e\u043f\u0446\u0438\u0438 \u0434\u043b\u044f \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043d\u0430 \u0437\u0430\u043f\u0438\u0441\u044c (&#8212;allow-fs-write) \u0438 \u0447\u0442\u0435\u043d\u0438\u0435 (&#8212;allow-fs-read) \u043a \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u043c \u0447\u0430\u0441\u0442\u044f\u043c \u0424\u0421,  \u0434\u043e\u0447\u0435\u0440\u043d\u0438\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430\u043c (&#8212;allow-child-process), \u0434\u043e\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f\u043c (&#8212;no-addons) \u0438  \u043f\u043e\u0442\u043e\u043a\u0430\u043c (&#8212;allow-worker).  \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0447\u0442\u043e\u0431\u044b \u0440\u0430\u0437\u0440\u0435\u0448\u0438\u0442\u044c \u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u043a\u0430\u0442\u0430\u043b\u043e\u0433 \/tmp \u0438 \u0447\u0442\u0435\u043d\u0438\u0435 \u0444\u0430\u0439\u043b\u0430 \/home\/index.js \u043c\u043e\u0436\u043d\u043e \u0443\u043a\u0430\u0437\u0430\u0442\u044c:        node &#8212;experimental-permission &#8212;allow-fs-write=\/tmp\/ &#8212;allow-fs-read=\/home\/index.js index.js\n<p>Per verificare l'accesso, si suggerisce di utilizzare il metodo process.permission.has(), ad esempio, \u2018process.permission.has(\u2018fs.write\u2019, \u2018\/tmp\/test\u2019).    <\/p>\n<li class=\"l\"> I gestori di moduli esterni ECMAScript (ESM), caricati tramite l'opzione \u2018--experimental-loader\u2019, ora vengono eseguiti in un thread separato, isolato dal thread principale, il che esclude l'intersezione tra il codice delle applicazioni e i moduli ESM caricati. Analogamente ai browser, il metodo import.meta.resolve() quando chiamato dall'applicazione ora viene eseguito in modalit\u00e0 sincronizzata. Nelle prossime versioni di Node.js si prevede di portare il supporto per il caricamento di ESM nel novero delle funzionalit\u00e0 stabili.\n<li class=\"l\"> Il modulo node:test (test_runner), destinato alla creazione e all'esecuzione di test in JavaScript che restituiscono il risultato nel formato TAP (Test Anything Protocol), \u00e8 stato recentemente reso stabile.\n<li class=\"l\"> \u00c8 stato formato un team separato di sviluppatori responsabili dell'ottimizzazione delle prestazioni, che ha lavorato per accelerare vari componenti runtime nella preparazione di una nuova versione, incluso il parsing degli URL, fetch() e EventTarget. Ad esempio, le spese generali per l'inizializzazione di EventTarget sono state ridotte della met\u00e0, significativamente migliorata la performance del metodo URL.canParse() e aumentata l'efficienza dei timer. Inoltre, \u00e8 stato incluso il rilascio di un parser URL ad alte prestazioni \u2013 Ada 2.0, scritto in C++.\n<li class=\"l\"> Continua lo sviluppo della funzionalit\u00e0 sperimentale per la distribuzione di applicazioni in forma di un singolo file eseguibile (SEA, Single Executable Applications). La creazione del file eseguibile richiede ora l'inserimento di un blob formato sulla base di un file di configurazione in formato JSON (invece dell'inserimento di un file JavaScript).\n<li class=\"l\"> Migliorata la compatibilit\u00e0 dell'API Web Crypto con le implementazioni di altri progetti.\n<li class=\"l\"> Aggiunta la supporto ufficiale per Windows sui sistemi ARM64.\n<li class=\"l\"> \u00c8 continuata l'implementazione del supporto per le estensioni WASI (WebAssembly System Interface) per la creazione di applicazioni WebAssembly isolate. \u00c8 stata rimossa la necessit\u00e0 di specificare un particolare flag della riga di comando per attivare il supporto WASI.            <\/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=\"1704\">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=58998\">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 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. 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