A avut loc lansarea Node.js 20.0, o platform\u0103 pentru rularea aplica\u021biilor de re\u021bea scrise \u00een JavaScript. Node.js 20.0 este clasificat \u00een ramurile cu suport pe termen lung, \u00eens\u0103 acest statut va fi acordat abia \u00een octombrie, dup\u0103 stabilizare. Suportul pentru Node.js 20.x va fi asigurat p\u00e2n\u0103 la 30 aprilie 2026. \u00centre\u021binerea versiunii anterioare LTS Node.js 18.x va dura p\u00e2n\u0103 \u00een aprilie 2025, iar pentru versiunea LTS 16.x p\u00e2n\u0103 \u00een septembrie 2023. \u00centre\u021binerea versiunii LTS 14.x se va \u00eencheia pe 30 aprilie, iar pentru versiunea intermediar\u0103 Node.js 19.x pe 1 iunie. <\/p>\n
\u00cembun\u0103t\u0103\u021biri principale: <\/p>\n
Pentru verificarea accesului se recomand\u0103 utilizarea metodei process.permission.has(), de exemplu, \u201eprocess.permission.has('fs.write', '\/tmp\/test').\u201d <\/p>\n
Platforma Node.js poate fi utilizat\u0103 at\u00e2t pentru suportul serverului \u00een func\u021bionarea aplica\u021biilor web, c\u00e2t \u0219i pentru crearea de aplica\u021bii client \u0219i server de re\u021bea obi\u0219nuite. Pentru a extinde func\u021bionalitatea aplica\u021biilor pentru Node.js a fost preg\u0103tit\u0103 o mare colec\u021bie de module, \u00een care se pot g\u0103si module cu implement\u0103ri servere<\/a> \u0219i clien\u021bi HTTP, SMTP, XMPP, DNS, FTP, IMAP, POP3, module pentru integrarea cu diverse framework-uri web, manejere WebSocket \u0219i Ajax, convertoare pentru baze de date (MySQL, PostgreSQL, SQLite, MongoDB), generatoare de \u0219abloane, motoare CSS, implement\u0103ri de algoritmi criptografici \u0219i sisteme de autorizare (OAuth), parsere XML. <\/p>\n Pentru a asigura procesarea unui num\u0103r mare de cereri paralele, Node.js utilizeaz\u0103 un model asincron de execu\u021bie a codului, bazat pe procesarea evenimentelor \u00een mod neblocat \u0219i pe definirea de callback-uri. Ca metode de multiplexare a conexiunilor sunt sus\u021binute metode precum epoll, kqueue, \/dev\/poll \u0219i select. Pentru multiplexarea conexiunilor se utilizeaz\u0103 biblioteca libuv, care este o extensie a libev \u00een sistemele Unix \u0219i a IOCP \u00een Windows. Pentru crearea unui pool de thread-uri este folosit\u0103 biblioteca libeio, iar pentru executarea cererilor DNS \u00een mod neblocat este integrat c-ares. Toate apelurile sistemice care provoac\u0103 blocarea sunt executate \u00een interiorul pool-ului de thread-uri \u0219i apoi, la fel ca manejerele de semnale, transmit rezultatul muncii lor \u00eenapoi printr-un canal anonim (pipe). Execu\u021bia codului JavaScript este asigurat\u0103 prin implicarea motorului V8 dezvoltat de compania Google (\u00een plus, Microsoft dezvolt\u0103 o variant\u0103 de Node.js cu motorul Chakra-Core). <\/p>\n \u00cen esen\u021b\u0103, Node.js este similar cu cadrele Perl AnyEvent, Ruby Event Machine, Python Twisted \u0219i implementarea evenimentelor \u00een Tcl, dar ciclul de gestionare a evenimentelor (event loop) din Node.js este ascuns de dezvoltator \u0219i seam\u0103n\u0103 cu gestionarea evenimentelor \u00eentr-o aplica\u021bie web care ruleaz\u0103 \u00een browser. C\u00e2nd scrie\u021bi aplica\u021bii pentru node.js, trebuie s\u0103 \u021bine\u021bi cont de specificul program\u0103rii orientate pe evenimente, de exemplu, \u00een loc s\u0103 executa\u021bi «var result = db.query(«select..»);» a\u0219tept\u00e2nd finalizarea lucr\u0103rii \u0219i procesarea ulterioar\u0103 a rezultatelor, \u00een Node.js se utilizeaz\u0103 principiul execu\u021biei asincrone, adic\u0103 codul se transform\u0103 \u00een «db.query(«select..», function (result) {procesare rezultat});», moment \u00een care controlul va trece instantaneu la codul ulterior, iar rezultatul interog\u0103rii va fi procesat pe m\u0103sur\u0103 ce datele sosesc. \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. 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Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"