{"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\/hu\/blog\/news\/dostupna-servernaya-javascript-platforma-node-js-20-0","title":{"rendered":"El\u00e9rhet\u0151 a Node.js 20.0 szerveroldali JavaScript-platform.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Megjelent a Node.js 20.0, a JavaScript nyelv\u0171 h\u00e1l\u00f3zati alkalmaz\u00e1sok futtat\u00e1s\u00e1ra szolg\u00e1l\u00f3 platform. A Node.js 20.0 a hossz\u00fa t\u00e1v\u00fa t\u00e1mogat\u00e1s\u00fa verzi\u00f3k k\u00f6z\u00e9 tartozik, de ezt a st\u00e1tuszt csak okt\u00f3berben kapja meg, a stabiliz\u00e1l\u00e1s ut\u00e1n. A Node.js 20.x t\u00e1mogat\u00e1sa 2026. \u00e1prilis 30-ig lesz el\u00e9rhet\u0151. A kor\u00e1bbi LTS \u00e1g, a Node.js 18.x t\u00e1mogat\u00e1sa 2025 \u00e1prilis\u00e1ig, m\u00edg a kor\u00e1bbi 16.x \u00e1g \u00e1prilis 30-ig, illetve 2023 szeptember\u00e9ig tart. A 14.x LTS \u00e1g t\u00e1mogat\u00e1sa \u00e1prilis 30-\u00e1n megsz\u0171nik, m\u00edg a 19.x k\u00f6ztes \u00e1g j\u00fanius 1-j\u00e9n \u00e9r v\u00e9get.     <\/p>\n<p>F\u0151 fejleszt\u00e9sek:  <\/p>\n<ul>\n<li class=\"l\"> A V8 motor 11.3-as verzi\u00f3ra friss\u00fclt, amely a Chromium 113-ban haszn\u00e1latos. A Node.js 19-hez k\u00e9pest, amely a Chromium 107-et haszn\u00e1lta, az \u00faj verzi\u00f3ban szerepel a String.prototype.isWellFormed \u00e9s toWellFormed, az Array.prototype \u00e9s TypedArray.prototype met\u00f3dusok, amelyek a t\u00f6mb\u00f6k \u00e9s TypedArray objektumok m\u00f3dos\u00edt\u00e1sakor haszn\u00e1lhat\u00f3 m\u00e1solatokkal dolgoznak. RegExp-ben meg\u00e9rkezett a 'v' jelz\u0151, t\u00e1mogat\u00e1st kapott az ArrayBuffer m\u00e9ret\u00e9nek v\u00e1ltoztat\u00e1sa \u00e9s a SharedArrayBuffer m\u00e9ret\u00e9nek n\u00f6vel\u00e9se, valamint a tail-call rekurszi\u00f3 a WebAssembly-ben.\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>A hozz\u00e1f\u00e9r\u00e9s ellen\u0151rz\u00e9s\u00e9re a process.permission.has() met\u00f3dus javasolt, p\u00e9ld\u00e1ul: 'process.permission.has('fs.write','\/tmp\/test').    <\/p>\n<li class=\"l\"> A k\u00fcls\u0151 ECMAScript (ESM) modulok, amelyeket az '--experimental-loader' opci\u00f3val t\u00f6ltenek be, mostant\u00f3l k\u00fcl\u00f6n sz\u00e1lon futnak, amely el van szigetelve a f\u0151 sz\u00e1lb\u00f3l, \u00edgy kiz\u00e1rva a k\u00f3dok \u00e1tfed\u00e9s\u00e9t az alkalmaz\u00e1sok \u00e9s a bet\u00f6lt\u00f6tt ESM modulok k\u00f6z\u00f6tt. A b\u00f6ng\u00e9sz\u0151kh\u00f6z hasonl\u00f3an, az import.meta.resolve() met\u00f3dus mostant\u00f3l szinkron m\u00f3don fut az alkalmaz\u00e1sb\u00f3l val\u00f3 h\u00edv\u00e1skor. A Node.js k\u00f6vetkez\u0151 \u00e1gaiban a ESM bet\u00f6lt\u00e9s\u00e9nek t\u00e1mogat\u00e1s\u00e1t stabil funkci\u00f3v\u00e1 tervezik alak\u00edtani.\n<li class=\"l\"> A node:test (test_runner) modul stabil \u00e1llapotba ker\u00fclt, amely a JavaScript nyelv\u0171 tesztek l\u00e9trehoz\u00e1s\u00e1ra \u00e9s futtat\u00e1s\u00e1ra szolg\u00e1l, \u00e9s TAP (Test Anything Protocol) form\u00e1tumban adja vissza az eredm\u00e9nyeket.\n<li class=\"l\"> L\u00e9trej\u00f6tt egy k\u00fcl\u00f6n fejleszt\u0151i csapat, amely a teljes\u00edtm\u00e9ny optimaliz\u00e1l\u00e1s\u00e1\u00e9rt felel\u0151s, \u00e9s \u00faj \u00e1g el\u0151k\u00e9sz\u00edt\u00e9se sor\u00e1n munk\u00e1t v\u00e9gzett a k\u00fcl\u00f6nb\u00f6z\u0151 runtime elemek, p\u00e9ld\u00e1ul az URL-elemz\u00e9s, a fetch() \u00e9s az EventTarget felgyors\u00edt\u00e1s\u00e1ra. P\u00e9ld\u00e1ul az EventTarget inicializ\u00e1l\u00e1s\u00e1nak k\u00f6lts\u00e9geit a fel\u00e9re cs\u00f6kkentett\u00e9k, jelent\u0151sen jav\u00edtott\u00e1k az URL.canParse() teljes\u00edtm\u00e9ny\u00e9t, \u00e9s n\u00f6velt\u00e9k a timerek hat\u00e9konys\u00e1g\u00e1t. Ezenk\u00edv\u00fcl a csomagba beker\u00fclt a nagy teljes\u00edtm\u00e9ny\u0171 URL-parszer, az Ada 2.0, amely C++ nyelven k\u00e9sz\u00fclt.\n<li class=\"l\"> Folyamatosan fejl\u0151dik k\u00eds\u00e9rleti funkci\u00f3 az alkalmaz\u00e1sok egyetlen v\u00e9grehajthat\u00f3 f\u00e1jl form\u00e1j\u00e1ban t\u00f6rt\u00e9n\u0151 sz\u00e1ll\u00edt\u00e1s\u00e1ra (SEA, Egy v\u00e9grehajthat\u00f3 alkalmaz\u00e1sok). A v\u00e9grehajthat\u00f3 f\u00e1jl l\u00e9trehoz\u00e1sa most a JSON-form\u00e1tum\u00fa konfigur\u00e1ci\u00f3s f\u00e1jl alapj\u00e1n gener\u00e1lt blob behelyettes\u00edt\u00e9s\u00e9t ig\u00e9nyli (a JavaScript-f\u00e1jl behelyettes\u00edt\u00e9se helyett).\n<li class=\"l\"> Javult a Web Crypto API kompatibilit\u00e1sa m\u00e1s projektek megval\u00f3s\u00edt\u00e1saival.\n<li class=\"l\"> Hivatalosan t\u00e1mogatott lett a Windows ARM64 rendszereken.\n<li class=\"l\"> Folyamatosan megval\u00f3s\u00edtj\u00e1k a WASI (WebAssembly System Interface) kiterjeszt\u00e9sek t\u00e1mogat\u00e1s\u00e1t elk\u00fcl\u00f6n\u00edtett WebAssembly alkalmaz\u00e1sok l\u00e9trehoz\u00e1s\u00e1ra. Megsz\u0171nt a WASI t\u00e1mogat\u00e1s enged\u00e9lyez\u00e9s\u00e9hez sz\u00fcks\u00e9ges k\u00fcl\u00f6n parancssori z\u00e1szl\u00f3 megad\u00e1sa.            <\/ul>\n<p>A Node.js platform szerver oldali webalkalmaz\u00e1sok m\u0171k\u00f6dtet\u00e9s\u00e9re, valamint hagyom\u00e1nyos kliens \u00e9s szerver h\u00e1l\u00f3zati programok k\u00e9sz\u00edt\u00e9s\u00e9re haszn\u00e1lhat\u00f3. A Node.js alkalmaz\u00e1sok funkcionalit\u00e1s\u00e1nak b\u0151v\u00edt\u00e9se \u00e9rdek\u00e9ben egy nagy modulgy\u0171jtem\u00e9ny k\u00e9sz\u00fclt, amely tartalmaz k\u00fcl\u00f6nb\u00f6z\u0151 megval\u00f3s\u00edt\u00e1s\u00fa modulokat.  <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/server\/\"   title=\"szerverek\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1704\">szerverek<\/a> \u00e9s HTTP, SMTP, XMPP, DNS, FTP, IMAP, POP3 klienseket, valamint modulokat k\u00fcl\u00f6nb\u00f6z\u0151 webkeretrendszerek integr\u00e1l\u00e1s\u00e1hoz, WebSocket \u00e9s Ajax kezel\u0151ket, az adatb\u00e1zisokhoz (MySQL, PostgreSQL, SQLite, MongoDB) val\u00f3 kapcsol\u00f3d\u00e1sokat, sablongener\u00e1torokat, CSS-motorokat, kriptogr\u00e1fiai algoritmusok \u00e9s hiteles\u00edt\u00e9si rendszerek (OAuth) megval\u00f3s\u00edt\u00e1sait, XML-parsereket.    <\/p>\n<p> A sz\u00e1mos p\u00e1rhuzamos k\u00e9r\u00e9s feldolgoz\u00e1s\u00e1nak biztos\u00edt\u00e1sa \u00e9rdek\u00e9ben a Node.js aszinkron k\u00f3dv\u00e9grehajt\u00e1si modellt haszn\u00e1l, amely esem\u00e9nyek alapj\u00e1n m\u0171k\u00f6dik, blokkol\u00e1smentes \u00fczemm\u00f3dban, \u00e9s callback kezel\u0151k defini\u00e1l\u00e1s\u00e1val. A kapcsolatok multiplexel\u00e9s\u00e9re olyan m\u00f3dszerek \u00e1llnak rendelkez\u00e9sre, mint az epoll, kqueue, \/dev\/poll \u00e9s select. A kapcsolatok multiplexel\u00e9s\u00e9re a libuv k\u00f6nyvt\u00e1rat haszn\u00e1lj\u00e1k, amely a libev f\u00f6l\u00e9 \u00e9p\u00fcl Unix rendszerekben \u00e9s az IOCP-t a Windows rendszerekben. A sz\u00e1lmedence (thread pool) l\u00e9trehoz\u00e1s\u00e1hoz a libeio k\u00f6nyvt\u00e1rat haszn\u00e1lj\u00e1k, m\u00edg a blokkol\u00e1smentes DNS-k\u00e9r\u00e9sek v\u00e9grehajt\u00e1s\u00e1hoz a c-ares integr\u00e1lva van. Minden blokkol\u00e1sos rendszersz\u00f3 h\u00edv\u00e1s a sz\u00e1lmedenc\u00e9n bel\u00fcl hajt\u00f3dik v\u00e9gre, \u00e9s a jelek kezel\u0151ihez hasonl\u00f3an az eredm\u00e9ny\u00fcket egy n\u00e9vtelen cs\u00f6v\u00f6n (pipe) kereszt\u00fcl adj\u00e1k vissza. A JavaScript-k\u00f3d v\u00e9grehajt\u00e1s\u00e1t a Google \u00e1ltal kifejlesztett V8 motor ig\u00e9nybev\u00e9tel\u00e9vel biztos\u00edtj\u00e1k (tov\u00e1bb\u00e1 a Microsoft kifejleszti a Node.js egy v\u00e1ltozat\u00e1t a Chakra-Core motorral).        <\/p>\n<p>A Node.js l\u00e9nyeg\u00e9ben hasonl\u00f3 a Perl AnyEvent, Ruby Event Machine, Python Twisted keretrendszerekhez, valamint a Tcl esem\u00e9nykezel\u00e9s\u00e9hez, de a Node.js event loop-ja rejtve van a fejleszt\u0151k el\u0151l, \u00e9s hasonl\u00edt a b\u00f6ng\u00e9sz\u0151ben fut\u00f3 webalkalmaz\u00e1sok esem\u00e9nykezel\u00e9s\u00e9re. Node.js alkalmaz\u00e1sok \u00edr\u00e1sakor figyelembe kell venni az esem\u00e9nyorient\u00e1lt programoz\u00e1s saj\u00e1toss\u00e1gait; p\u00e9ld\u00e1ul ahelyett, hogy a &#171;var result = db.query(&#171;select..&#187;);&#187; k\u00f3dot v\u00e1rakoztatva futtassuk \u00e9s k\u00e9s\u0151bb dolgozzuk fel az eredm\u00e9nyeket, a Node.js aszinkron v\u00e9grehajt\u00e1si elvet alkalmaz, azaz a k\u00f3d &#171;db.query(&#171;select..&#187;, function (result) {eredm\u00e9ny feldolgoz\u00e1sa});&#187; form\u00e1ban alakul, \u00edgy a vez\u00e9rl\u00e9s azonnal \u00e1tad\u00f3dik a tov\u00e1bbi k\u00f3dnak, m\u00edg az eredm\u00e9ny a be\u00e9rkez\u0151 adatok alapj\u00e1n lesz feldolgozva.<br \/>\n<br \/>Forr\u00e1s: <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. 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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