{"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\/et\/blog\/novosti-interneta\/dostupna-servernaya-javascript-platforma-node-js-20-0","title":{"rendered":"Saadaval on JavaScript-serveri platvorm Node.js 20.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>V\u00e4lja Node.js 20.0, platvorm, mis v\u00f5imaldab JavaScripti p\u00f5hiseid v\u00f5rgurakendusi. Node.js 20.0 on m\u00e4\u00e4ratud pikaajalise toetuse harudesse, kuid see staatus omandatakse alles oktoobris, p\u00e4rast stabiliseerimist. Node.js 20.x toetus kestab kuni 30. aprill 2026. Eelmise LTS haru Node.js 18.x toetus kestab aprillini 2025, ja eelneva LTS haru 16.x kuni septembrini 2023. LTS haru 14.x toetus l\u00f5peb 30. aprillil, vaheharu Node.js 19.x toetus aga 1. juunil.     <\/p>\n<p>Peamised parandused:  <\/p>\n<ul>\n<li class=\"l\"> Mootor V8 on uuendatud versioonile 11.3, mida kasutatakse Chromium 113-s. Muudatused v\u00f5rreldes Node.js 19 haruga, kus kasutati Chromium 107 mootorit, h\u00f5lmavad funktsioone String.prototype.isWellFormed ja toWellFormed, meetodeid Array.prototype ja TypedArray.prototype t\u00f6\u00f6tlemiseks objekti Array ja TypedArray muutmisel, lippu 'v' RegExp-s, ArrayBuffer'i suuruse muutmise ja SharedArrayBuffer'i suurendamise toetust, ning tail-call rekursioon WebAssembly-s.\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>Ligip\u00e4\u00e4su kontrollimiseks soovitatakse kasutada meetodit process.permission.has(), n\u00e4iteks 'process.permission.has('fs.write', '\/tmp\/test').    <\/p>\n<li class=\"l\"> ECMAScript (ESM) v\u00e4liste moodulite t\u00f6\u00f6tlejad, mis laaditakse valiku '--experimental-loader' kaudu, t\u00e4idetakse n\u00fc\u00fcd eraldi l\u00f5imes, mis on isoleeritud p\u00f5hivoolust, v\u00e4ltides rakenduste ja laaditavate ESM-moodulite koodi ristumist. Sarnaselt brauseritega k\u00e4ivitub meetod import.meta.resolve(), kui seda rakendusest kutsuda, n\u00fc\u00fcd s\u00fcnkroonselt. \u00dches j\u00e4rgmistest Node.js harudest plaanitakse ESM-i laadimise toe \u00fcle viia stabiilsete v\u00f5imaluste kategooriasse.\n<li class=\"l\"> Stabiilseks on muudetud moduli node:test (test_runner), mis on m\u00f5eldud JavaScriptis testide loomiseks ja k\u00e4ivitamiseks, tagastades tulemuse TAP (Test Anything Protocol) formaadis.\n<li class=\"l\"> Ainult arendajate meeskond, kes vastutab j\u00f5udluse optimeerimise eest, on moodustatud, mis on ette valmistanud uusi harusid ning teinud t\u00f6\u00f6d erinevate runtime-komponentide, sealhulgas URL-i parsimise, fetch() ja EventTargeti kiirusel. N\u00e4iteks on EventTargeti initsialiseerimise kulu kahekordistunud, meetodi URL.canParse() efektiivsus on oluliselt paranenud ja taimerite t\u00f6\u00f6 t\u00f5husus on parandatud. Lisaks on arendustootesse kaasatud k\u00f5rge j\u00f5udlusega URL-parsija - Ada 2.0, mis on kirjutatud C++ keeles.\n<li class=\"l\"> Eksperimentaalse v\u00f5imaluse arendamine \u00fcksiku t\u00e4idisega rakenduste (SEA, Single Executable Applications) tarnimiseks on j\u00e4tkunud. T\u00e4idise loomine n\u00f5uab n\u00fc\u00fcd JSON-formaadis konfiguratsioonifaili p\u00f5hjal genereeritud blob'i asendust (JavaScripti faili asendamise asemel).\n<li class=\"l\"> Web Crypto API \u00fchilduvust on parandatud teiste projektide rakendustega.\n<li class=\"l\"> Lisatud ametlik tugi Windowsi s\u00fcsteemidele ARM64 arhitektuuris.\n<li class=\"l\"> WASI (WebAssembly System Interface) laienduste toe rakendamine on j\u00e4tkuvalt aktiivne, et luua isoleeritud WebAssembly rakendusi. Erilise k\u00e4surea lipu m\u00e4\u00e4ramise vajadus WASI toe aktiveerimiseks on eemaldatud.            <\/ul>\n<p>Node.js platvormi saab kasutada nii veebirakenduste serveripoolses toetuses kui ka tavap\u00e4raste kliendi- ja serveripoolsete v\u00f5rguprogrammide loomiseks. Node.js rakenduste funktsionaalsuse laiendamiseks on koostatud suur moodulite kogu, kust leiate moodulid HTTP, SMTP, XMPP, DNS, FTP, IMAP, POP3 klientide rakendamiseks.  <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/\"   title=\"serverite\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1704\">serverite<\/a> Lisaks on saadaval moodulid erinevate veebiraamistikest integreerimiseks, WebSocketi ja Ajax t\u00f6\u00f6tlejate, andmebaasi \u00fchenduse moodulite (MySQL, PostgreSQL, SQLite, MongoDB), templaatide, CSS-mootorite, kr\u00fcptoalgoritmide ja autoriseerimiss\u00fcsteemide (OAuth), XML-parside rakendusteks.    <\/p>\n<p> Node.js kasutab paljude paralleelsete p\u00e4ringute t\u00f6\u00f6tlemiseks as\u00fcnkroonset koodik\u00e4itlusmudelit, mille aluseks on s\u00fcndmuste mittes\u00fcvendav t\u00f6\u00f6tlemine ja tagasikutsumiste m\u00e4\u00e4ramine. \u00dchenduste multiplexerimiseks toetatakse selliseid meetodeid nagu epoll, kqueue, \/dev\/poll ja select. \u00dchenduste multiplexerimiseks kasutatakse libuv raamatukogu, mis on Unix-s\u00fcsteemides libev ja Windowsis IOCP. T\u00f6\u00f6tajate basaari (thread pool) loomiseks kasutatakse libeio raamatukogu ning mittes\u00fcvendav DNS-p\u00e4ringute t\u00f6\u00f6tlemine on integreeritud c-ares'iga. K\u00f5ik s\u00fcsteemi kutsed, mis v\u00f5ivad blokeeruda, t\u00e4idetakse t\u00f6\u00f6tajate basaari sees ja seej\u00e4rel, nagu ka signaalide t\u00f6\u00f6tlejad, edastavad oma t\u00f6\u00f6 tulemuse tagasi anon\u00fc\u00fcmsesse torusse (pipe). JavaScripti koodi t\u00e4itmine tagatakse Google'i loodud V8 mootori kaasamise kaudu (t\u00e4psemalt arendab Microsoft Node.js varianti Chakra-Core mootoriga).        <\/p>\n<p>Node.js iseloom on sarnane Perl AnyEvent, Ruby Event Machine, Python Twisted raamistikele ning Tcl s\u00fcndmuste rakendusele, kuid Node.js s\u00fcndmustet\u00f6\u00f6tlemise ts\u00fckkel (event loop) on arendajalt peidetud ja meenutab veebirakenduses, mis t\u00f6\u00f6tab brauseris, s\u00fcndmuste t\u00f6\u00f6tlemist. Node.js rakenduste kirjutamisel tuleb arvestada s\u00fcndmustep\u00f5hise programmeerimise erip\u00e4ra, n\u00e4iteks: selle asemel, et t\u00e4ita &#171;var result = db.query(&#171;select..&#187;);&#187; ja oodata, kuni t\u00f6\u00f6tlemine on l\u00f5ppenud ning tulemusi t\u00f6\u00f6deldakse, kasutatakse Node.js-s as\u00fcnkroonset t\u00e4itmisprintsiipi, st kood muudetakse &#171;db.query(&#171;select..&#187;, function (result) {tulemuse t\u00f6\u00f6tlemine});&#187;, mille korral antakse juhtimine viivitamatult \u00fcle j\u00e4rgmisele koodile ja p\u00e4ringu tulemust t\u00f6\u00f6deldakse andmete saabumise ajal.<br \/>\n<br \/>Allikas: <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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