{"id":39242,"date":"2019-10-31T22:28:38","date_gmt":"2019-10-31T19:28:38","guid":{"rendered":"https:\/\/prohoster.info\/blog\/vypusk-servernoj-javascript-platformy-node-js-13-0\/"},"modified":"2019-10-31T22:28:38","modified_gmt":"2019-10-31T19:28:38","slug":"vypusk-servernoj-javascript-platformy-node-js-13-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/vypusk-servernoj-javascript-platformy-node-js-13-0","title":{"rendered":"Utgivning av serverbaserade JavaScript-plattformen Node.js 13.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/nodejs.org\/en\/blog\/release\/v13.0.0\/\">Tillg\u00e4nglig<\/a><\/noindex> utgivning <noindex><a rel=\"nofollow\" href=\"https:\/\/nodejs.org\">Node.js 13.0<\/a><\/noindex>, plattformar f\u00f6r att k\u00f6ra n\u00e4tverksapplikationer i JavaScript. Samtidigt har stabiliseringen av den tidigare versionen Node.js 12.x slutf\u00f6rts, som nu har flyttats till kategorin LTS-utg\u00e5vor med uppdateringar som sl\u00e4pps under 4 \u00e5r. St\u00f6det f\u00f6r den tidigare LTS-versionen Node.js 10.0 kommer att p\u00e5g\u00e5 fram till april 2021, och st\u00f6det f\u00f6r den f\u00f6reg\u00e5ende LTS-versionen 8.0 kommer att p\u00e5g\u00e5 till januari 2020.<\/p>\n<p>Huvud <noindex><a rel=\"nofollow\" href=\"https:\/\/medium.com\/@nodejs\/node-js-12-to-lts-and-node-js-13-is-here-e28d6a4a2bd\">f\u00f6rb\u00e4ttringar<\/a><\/noindex>:<\/p>\n<ul>\n<li class=\"l\"> V8-motorn har uppdaterats till version <noindex><a rel=\"nofollow\" href=\"https:\/\/v8.dev\/\">7.8<\/a><\/noindex>, d\u00e4r nya metoder f\u00f6r prestandaoptimering har implementerats, objekt-destructuring har f\u00f6rb\u00e4ttrats, minnesanv\u00e4ndningen har minskats och tiden f\u00f6r att f\u00f6rbereda WebAssembly har kortats;\n<li class=\"l\"> Internationell och Unicode-st\u00f6d \u00e4r nu helt aktiverat baserat p\u00e5 biblioteken <noindex><a rel=\"nofollow\" href=\"http:\/\/site.icu-project.org\/\">ICU<\/a><\/noindex> (International Components for Unicode), vilket g\u00f6r det m\u00f6jligt f\u00f6r utvecklare att skriva kod som <noindex><a rel=\"nofollow\" href=\"https:\/\/nodejs.org\/api\/intl.html#intl_providing_icu_data_at_runtime\">st\u00f6djer<\/a><\/noindex> arbete med olika spr\u00e5k och lokaliseringar. Modulen full-icu \u00e4r nu installerad som standard;\n<li class=\"l\"> API:n f\u00f6r <noindex><a rel=\"nofollow\" href=\"https:\/\/nodejs.org\/api\/worker_threads.html\">Workers Threads<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/medium.com\/@Trott\/using-worker-threads-in-node-js-80494136dbb6\">m\u00f6jligg\u00f6r<\/a><\/noindex> g\u00f6r det m\u00f6jligt att skapa multitr\u00e5dade h\u00e4ndelseloopar. Implementeringen baseras p\u00e5 modulen worker_threads, som till\u00e5ter att JavaScript-kod k\u00f6rs i flera parallella tr\u00e5dar. Stabilt st\u00f6d f\u00f6r API:n Workers Threads har ocks\u00e5 bakportats till LTS-versionen Node.js 12.x;\n<li class=\"l\"> Krav p\u00e5 plattformar har h\u00f6jts. F\u00f6r byggandet kr\u00e4vs nu <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/nodejs\/node\/blob\/master\/BUILDING.md#platform-list\">kr\u00e4vs<\/a><\/noindex> \u00e5tminstone macOS 10.11 (Xcode 10 kr\u00e4vs), AIX 7.2, Ubuntu 16.04, Debian 9, EL 7, Alpine 3.8, Windows 7\/2008;\n<li class=\"l\"> St\u00f6det f\u00f6r Python 3 har f\u00f6rb\u00e4ttrats. Om b\u00e5de Python 2 och Python 3 finns i systemet, anv\u00e4nds fortfarande Python 2, men det har lagts till en m\u00f6jlighet att bygga om systemet med endast Python 3;\n<li class=\"l\"> Den gamla implementationen av HTTP-parsern (&#171;&#8212;http-parser=legacy&#187;) har tagits bort. Anrop och egenskaper som FSWatcher.prototype.start(), ChildProcess._channel, metoden open() i objekten ReadStream och WriteStream, request.connection, response.connection, module.createRequireFromPath() har tagits bort eller klassificerats som f\u00f6r\u00e5ldrade.\n<li class=\"l\"> F\u00f6ljande <noindex><a rel=\"nofollow\" href=\"https:\/\/nodejs.org\/en\/blog\/release\/v13.0.1\/\">sl\u00e4pptes<\/a><\/noindex> uppdateringen 13.0.1, d\u00e4r flera buggar \u00e5tg\u00e4rdades omg\u00e5ende. Bland annat \u00e5tg\u00e4rdades ett problem med aviseringen om att en obeh\u00f6rig version av npm 6.12.0 anv\u00e4ndes.\n<\/ul>\n<p>Vi p\u00e5minner om att Node.js-plattformen kan anv\u00e4ndas b\u00e5de f\u00f6r serverh\u00e5llning av webapplikationer och f\u00f6r att skapa vanliga klient- och servern\u00e4tverksprogram. F\u00f6r att ut\u00f6ka funktionaliteten i applikationer f\u00f6r Node.js har en stor <noindex><a rel=\"nofollow\" href=\"https:\/\/www.npmjs.com\/\">samling av moduler<\/a><\/noindex>, som inneh\u00e5ller moduler med implementationer av HTTP-, SMTP-, XMPP-, DNS-, FTP-, IMAP-, POP3-servrar och klienter, moduler f\u00f6r integration med olika webbramverk, WebSocket och Ajax hanterare, kopplingar till databaser (MySQL, PostgreSQL, SQLite, MongoDB), mallmotorer, CSS-motorer, implementationer av kryptografi-algoritmer och autentiseringssystem (OAuth), XML-parsers.<\/p>\n<p> F\u00f6r att hantera ett stort antal parallella f\u00f6rfr\u00e5gningar anv\u00e4nder Node.js en asynkron kodk\u00f6rningsmodell baserad p\u00e5 h\u00e4ndelsehantering i icke-blockerande l\u00e4ge och definiering av callback-hanterare. Metoder som epoll, kqueue, \/dev\/poll och select st\u00f6ds f\u00f6r anslutningsmultiplexering. F\u00f6r multiplexering av anslutningar anv\u00e4nds biblioteket <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/libuv\/libuv\">libuv<\/a><\/noindex>, som \u00e4r ett lager \u00f6ver <noindex><a rel=\"nofollow\" href=\"http:\/\/software.schmorp.de\/pkg\/libev.html\">libev<\/a><\/noindex> i Unix-system och \u00f6ver IOCP i Windows. F\u00f6r att skapa en tr\u00e5dpool anv\u00e4nds biblioteket <noindex><a rel=\"nofollow\" href=\"http:\/\/software.schmorp.de\/pkg\/libeio.html\">libeio<\/a><\/noindex>, f\u00f6r att utf\u00f6ra DNS-f\u00f6rfr\u00e5gningar i icke-blockerande l\u00e4ge \u00e4r <noindex><a rel=\"nofollow\" href=\"http:\/\/c-ares.haxx.se\/\">c-ares<\/a><\/noindex>integrerat. Alla systemanrop som orsakar blockering utf\u00f6rs inom tr\u00e5dpoolen och skickar sedan, precis som signalhanterare, tillbaka resultatet av sitt arbete genom en namnl\u00f6s kanal (pipe). Utf\u00f6rande av JavaScript-kod sker genom anv\u00e4ndning av den motor som utvecklats av Google, <noindex><a rel=\"nofollow\" href=\"http:\/\/code.google.com\/p\/v8\/\">V8<\/a><\/noindex> (dessutom utvecklar Microsoft en version av Node.js med Chakra-Core-motorn).  <\/p>\n<p>I grunden liknar Node.js-ramverken <noindex><a rel=\"nofollow\" href=\"http:\/\/search.cpan.org\/dist\/AnyEvent\/\">Perl AnyEvent<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/eventmachine\/eventmachine\">Ruby Event Machine<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"http:\/\/twistedmatrix.com\/\">Python Twisted<\/a><\/noindex> och <noindex><a rel=\"nofollow\" href=\"http:\/\/wiki.tcl.tk\/1527\">implementation<\/a><\/noindex> H\u00e4ndelser i Tcl, men h\u00e4ndelsehanteringsloopen (event loop) i Node.js \u00e4r dold f\u00f6r utvecklaren och p\u00e5minner om h\u00e4ndelsehantering i ett webbaserat program som k\u00f6rs i en webbl\u00e4sare. N\u00e4r man skriver applikationer f\u00f6r Node.js m\u00e5ste man ta h\u00e4nsyn till s\u00e4rdragen i eventdriven programmering; till exempel, ist\u00e4llet f\u00f6r att utf\u00f6ra &#171;var result = db.query(&#171;select..&#187;);&#187; med v\u00e4ntan p\u00e5 att processen ska slutf\u00f6ras och efterf\u00f6ljande bearbetning av resultaten, anv\u00e4nds en asynkron k\u00f6rprincip i Node.js, dvs. koden transformeras till &#171;db.query(&#171;select..&#187;, function (result) {bearbeta resultatet});&#187;, d\u00e4r kontrollen omedelbart \u00f6verg\u00e5r till vidare kod, medan resultatet av f\u00f6rfr\u00e5gan bearbetas i takt med att data kommer in. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>K\u00e4lla: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51741\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0435\u043b\u0438\u0437 Node.js 13.0, \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. \u041e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0430 \u0441\u0442\u0430\u0431\u0438\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u043f\u0440\u043e\u0448\u043b\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 Node.js 12.x, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u0435\u0440\u0435\u0432\u0435\u0434\u0435\u043d\u0430 \u0432 \u043a\u0430\u0442\u0435\u0433\u043e\u0440\u0438\u044e \u0432\u044b\u043f\u0443\u0441\u043a\u043e\u0432 \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, \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0434\u043b\u044f \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u044e\u0442\u0441\u044f \u0432 \u0442\u0435\u0447\u0435\u043d\u0438\u0435 4 \u043b\u0435\u0442. \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 LTS-\u0432\u0435\u0442\u043a\u0438 Node.js 10.0 \u043f\u0440\u043e\u0434\u043b\u0438\u0442\u0441\u044f \u0434\u043e \u0430\u043f\u0440\u0435\u043b\u044f 2021 \u0433\u043e\u0434\u0430, \u0430 \u043f\u043e\u0437\u0430\u043f\u0440\u043e\u0448\u043b\u043e\u0439 LTS-\u0432\u0435\u0442\u043a\u0438 8.0 \u0434\u043e \u044f\u043d\u0432\u0430\u0440\u044f 2020 \u0433\u043e\u0434\u0430. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 [&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-39242","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0435\u043b\u0438\u0437 Node.js 13.0, \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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