{"id":78969,"date":"2020-04-23T13:42:02","date_gmt":"2020-04-23T11:42:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-servernoj-javascript-platformy-node-js-14-0"},"modified":"2020-04-23T13:42:02","modified_gmt":"2020-04-23T11:42:02","slug":"vypusk-servernoj-javascript-platformy-node-js-14-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/vypusk-servernoj-javascript-platformy-node-js-14-0","title":{"rendered":"Vyd\u00e1n\u00ed serverov\u00e9 JavaScript platformy Node.js 14.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/nodejs.org\/en\/blog\/release\/v14.0.0\/\">Prob\u011bhlo<\/a><\/noindex> vyd\u00e1n\u00ed <noindex><a rel=\"nofollow\" href=\"https:\/\/nodejs.org\">Node.js 14.0<\/a><\/noindex>, platformy pro provoz s\u00ed\u0165ov\u00fdch aplikac\u00ed napsan\u00fdch v jazyce JavaScript. Node.js 14.0 se \u0159ad\u00ed mezi v\u011btve s dlouhodobou podporou, tento status v\u0161ak bude p\u0159id\u011blen a\u017e v \u0159\u00edjnu po stabilizaci. Podpora Node.js 14.0 bude <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/nodejs\/Release\">poskytov\u00e1na<\/a><\/noindex> do dubna 2023. Podpora p\u0159edchoz\u00ed LTS v\u011btve Node.js 12.0 potrv\u00e1 do dubna 2022, a p\u0159edp\u0159edchoz\u00ed LTS v\u011btve 10.0 do dubna 2021. Podpora mezilehl\u00e9 v\u011btve 13.x skon\u010d\u00ed v \u010dervnu leto\u0161n\u00edho roku.<\/p>\n<p>Hlavn\u00ed <noindex><a rel=\"nofollow\" href=\"https:\/\/medium.com\/@nodejs\/node-js-version-14-available-now-8170d384567e\">vylep\u0161en\u00ed<\/a><\/noindex>:<\/p>\n<ul>\n<li class=\"l\"> Byla stabilizov\u00e1na mo\u017enost dynamick\u00e9ho generov\u00e1n\u00ed nebo p\u0159i ur\u010dit\u00fdch ud\u00e1lostech <noindex><a rel=\"nofollow\" href=\"https:\/\/medium.com\/the-node-js-collection\/easily-identify-problems-in-node-js-applications-with-diagnostic-report-dc82370d8029\">diagnostick\u00fdch zpr\u00e1v<\/a><\/noindex>, kter\u00e9 odr\u00e1\u017eej\u00ed ud\u00e1losti usnad\u0148uj\u00edc\u00ed diagnostiku probl\u00e9m\u016f jako jsou p\u00e1dy, poklesy v\u00fdkonu, \u00faniky pam\u011bti, vysok\u00e9 zat\u00ed\u017een\u00ed CPU, neo\u010dek\u00e1van\u00fd v\u00fdstup chyb atd.\n<li class=\"l\"> Byla p\u0159id\u00e1na experiment\u00e1ln\u00ed podpora API <noindex><a rel=\"nofollow\" href=\"https:\/\/nodejs.org\/api\/async_hooks.html#async_hooks_class_asynclocalstorage\">Async Local Storage<\/a><\/noindex> s implementac\u00ed t\u0159\u00eddy AsyncLocalStorage, kter\u00e1 m\u016f\u017ee b\u00fdt pou\u017eita k vytvo\u0159en\u00ed asynchronn\u00edho stavu s obslu\u017en\u00fdmi funkcemi zalo\u017een\u00fdmi na zp\u011btn\u00fdch vol\u00e1n\u00edch a promise. AsyncLocalStorage umo\u017e\u0148uje uchov\u00e1vat data po dobu zpracov\u00e1n\u00ed webov\u00e9ho po\u017eadavku, p\u0159ipom\u00ednaj\u00edc\u00ed lok\u00e1ln\u00ed \u00falo\u017ei\u0161t\u011b pro jednotliv\u00e9 vl\u00e1kna (Thread-Local Storage) v jin\u00fdch jazyc\u00edch.\n<li class=\"l\"> Bylo odstran\u011bno varov\u00e1n\u00ed o experiment\u00e1ln\u00ed funkci p\u0159i na\u010d\u00edt\u00e1n\u00ed <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/nodejs\/node\/blob\/master\/doc\/api\/esm.md\">modul\u016f<\/a><\/noindex>  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=42450\">ECMAScript 6<\/a><\/noindex> p\u0159ipojovan\u00fdch a exportovan\u00fdch pomoc\u00ed v\u00fdraz\u016f import a export. Samotn\u00e1 implementace modul\u016f ESM zat\u00edm z\u016fst\u00e1v\u00e1 experiment\u00e1ln\u00ed.\n<li class=\"l\"> Engine V8 byl aktualizov\u00e1n na verzi <noindex><a rel=\"nofollow\" href=\"https:\/\/v8.dev\/\">8.1<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52000\">1<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52565\">2<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52312\">3<\/a><\/noindex>), ve kter\u00e9 byly p\u0159id\u00e1ny nov\u00e9 optimalizace v\u00fdkonu a novinky, jako je nov\u00fd logick\u00fd oper\u00e1tor slou\u010den\u00ed &#171;??&#187; (vrac\u00ed prav\u00fd operand, pokud je lev\u00fd operand NULL nebo undefined, a naopak), oper\u00e1tor &#171;?.&#187; pro jednor\u00e1zov\u00e9 ov\u011b\u0159en\u00ed cel\u00e9 \u0159ady vlastnost\u00ed nebo vol\u00e1n\u00ed (nap\u0159\u00edklad &#171;db?.user?.name?.length&#187; bez p\u0159edb\u011b\u017en\u00fdch kontrol), metoda Intl.DisplayName pro z\u00edsk\u00e1n\u00ed lokalizovan\u00fdch n\u00e1zv\u016f atd.\n<li class=\"l\"> Byla provedena revize API Streams zam\u011b\u0159en\u00e1 na zlep\u0161en\u00ed konzistence API rozhran\u00ed Streams a odstran\u011bn\u00ed rozd\u00edl\u016f v chov\u00e1n\u00ed z\u00e1kladn\u00edch \u010d\u00e1st\u00ed Node.js. Nap\u0159\u00edklad chov\u00e1n\u00ed http.OutgoingMessage je p\u0159ibl\u00ed\u017eeno k stream.Writable a net.Socket k stream.Duplex. Mo\u017enost autoDestroy je ve v\u00fdchoz\u00edm nastaven\u00ed nastavena na &#171;true&#187;, co\u017e znamen\u00e1, \u017ee dojde k vyvol\u00e1n\u00ed &#171;_destroy&#187; po dokon\u010den\u00ed.\n<li class=\"l\"> Byla p\u0159id\u00e1na experiment\u00e1ln\u00ed podpora API <noindex><a rel=\"nofollow\" href=\"https:\/\/nodejs.org\/api\/wasi.html\">WASI<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50406\">WebAssembly System Interface<\/a><\/noindex>), kter\u00fd poskytuje aplika\u010dn\u00ed rozhran\u00ed pro p\u0159\u00edmou interakci s opera\u010dn\u00edm syst\u00e9mem (POSIX API pro pr\u00e1ci se soubory, sokety atd.).\n<li class=\"l\"> Zv\u00fd\u0161eny po\u017eadavky na <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/nodejs\/node\/blob\/v12.x\/BUILDING.md#platform-list\">minim\u00e1ln\u00ed verze<\/a><\/noindex> kompil\u00e1tor\u016f a platforem: macOS 10.13 (High Sierra), GCC 6,  <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/nodejs\/node\/pull\/31954\">Windows nov\u011bji ne\u017e 7\/2008R2<\/a><\/noindex>.\n<\/ul>\n<p>P\u0159ipom\u00edn\u00e1me, \u017ee platforma Node.js m\u016f\u017ee b\u00fdt pou\u017eita jak pro serverov\u00e9 zaji\u0161t\u011bn\u00ed provozu webov\u00fdch aplikac\u00ed, tak pro vytv\u00e1\u0159en\u00ed b\u011b\u017en\u00fdch klientsk\u00fdch a serverov\u00fdch s\u00ed\u0165ov\u00fdch program\u016f. Pro roz\u0161\u00ed\u0159en\u00ed funkcionality aplikac\u00ed pro Node.js je p\u0159ipravena velk\u00e1 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.npmjs.com\/\">sb\u00edrka modul\u016f<\/a><\/noindex>, ve kter\u00e9 lze naj\u00edt moduly s realizac\u00ed server\u016f a klient\u016f HTTP, SMTP, XMPP, DNS, FTP, IMAP, POP3, moduly pro integraci s r\u016fzn\u00fdmi webov\u00fdmi frameworky, zpracovatele WebSocket a Ajax, konektory k DBMS (MySQL, PostgreSQL, SQLite, MongoDB), \u0161ablonovac\u00ed n\u00e1stroje, CSS engine, implementace kryptologick\u00fdch algoritm\u016f a syst\u00e9m\u016f autorizace (OAuth), XML parser\u016f.<\/p>\n<p> Pro zaji\u0161t\u011bn\u00ed zpracov\u00e1n\u00ed velk\u00e9ho po\u010dtu paraleln\u00edch po\u017eadavk\u016f Node.js vyu\u017e\u00edv\u00e1 asynchronn\u00ed model spu\u0161t\u011bn\u00ed k\u00f3du, zalo\u017een\u00fd na zpracov\u00e1n\u00ed ud\u00e1lost\u00ed v neblokuj\u00edc\u00edm re\u017eimu a definov\u00e1n\u00ed callback zpracovatel\u016f. Jako zp\u016fsoby multiplexov\u00e1n\u00ed p\u0159ipojen\u00ed jsou podporov\u00e1ny metody jako epoll, kqueue, \/dev\/poll a select. Pro multiplexov\u00e1n\u00ed p\u0159ipojen\u00ed se pou\u017e\u00edv\u00e1 knihovna <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/libuv\/libuv\">libuv<\/a><\/noindex>, kter\u00e1 je nadstavbou nad <noindex><a rel=\"nofollow\" href=\"http:\/\/software.schmorp.de\/pkg\/libev.html\">libev<\/a><\/noindex> v syst\u00e9mech Unix a nad IOCP ve Windows. Pro vytv\u00e1\u0159en\u00ed baz\u00e9nu vl\u00e1ken (thread pool) je vyu\u017eita knihovna <noindex><a rel=\"nofollow\" href=\"http:\/\/software.schmorp.de\/pkg\/libeio.html\">libeio<\/a><\/noindex>, pro prov\u00e1d\u011bn\u00ed DNS dotaz\u016f v neblokuj\u00edc\u00edm re\u017eimu je integrov\u00e1n <noindex><a rel=\"nofollow\" href=\"http:\/\/c-ares.haxx.se\/\">c-ares<\/a><\/noindex>. V\u0161echny syst\u00e9mov\u00e9 vol\u00e1n\u00ed, kter\u00e1 by mohla blokovat, jsou prov\u00e1d\u011bna uvnit\u0159 baz\u00e9nu vl\u00e1ken a pot\u00e9, stejn\u011b jako zpracovatel\u00e9 sign\u00e1l\u016f, p\u0159ed\u00e1vaj\u00ed v\u00fdsledek sv\u00e9 pr\u00e1ce zp\u011bt p\u0159es anonymn\u00ed kan\u00e1l (pipe). Vykon\u00e1v\u00e1n\u00ed JavaScript k\u00f3du je zaji\u0161t\u011bno prost\u0159ednictv\u00edm zapojen\u00ed engine vyvinut\u00e9ho spole\u010dnost\u00ed Google <noindex><a rel=\"nofollow\" href=\"http:\/\/code.google.com\/p\/v8\/\">V8<\/a><\/noindex> (nav\u00edc Microsoft vyv\u00edj\u00ed variantu Node.js s engine chakra-core).  <\/p>\n<p>Ve sv\u00e9 podstat\u011b je Node.js podobn\u00fd framework\u016fm <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> a <noindex><a rel=\"nofollow\" href=\"http:\/\/wiki.tcl.tk\/1527\">realizaci<\/a><\/noindex> ud\u00e1lost\u00ed v Tcl, ale smy\u010dka zpracov\u00e1n\u00ed ud\u00e1lost\u00ed (event loop) v Node.js je skryta p\u0159ed v\u00fdvoj\u00e1\u0159em a p\u0159ipom\u00edn\u00e1 zpracov\u00e1n\u00ed ud\u00e1lost\u00ed v webov\u00e9 aplikaci b\u011b\u017e\u00edc\u00ed v prohl\u00ed\u017ee\u010di. P\u0159i psan\u00ed aplikac\u00ed pro Node.js je t\u0159eba br\u00e1t v \u00favahu specifika ud\u00e1lostmi \u0159\u00edzen\u00e9ho programov\u00e1n\u00ed, nap\u0159\u00edklad m\u00edsto prov\u00e1d\u011bn\u00ed &#171;var result = db.query(&#171;select..&#187;);&#187; s o\u010dek\u00e1v\u00e1n\u00edm dokon\u010den\u00ed a n\u00e1slednou zpracov\u00e1n\u00edm v\u00fdsledk\u016f, v Node.js se pou\u017e\u00edv\u00e1 princip asynchronn\u00edho prov\u00e1d\u011bn\u00ed, tj. k\u00f3d se transformuje na &#171;db.query(&#171;select..&#187;, function (result) {zpracov\u00e1n\u00ed v\u00fdsledku});&#187;, p\u0159i kter\u00e9m kontrola okam\u017eit\u011b p\u0159ejde k dal\u0161\u00edmu k\u00f3du a v\u00fdsledek dotazu bude zpracov\u00e1n, jakmile doraz\u00ed data. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52786\">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 14.0, \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 14.0 \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0441\u044f \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 14.0 \u0431\u0443\u0434\u0435\u0442 \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0442\u044c\u0441\u044f \u0434\u043e \u0430\u043f\u0440\u0435\u043b\u044f 2023 \u0433\u043e\u0434\u0430. \u0421\u043e\u043f\u0440\u043e\u0432\u043e\u0436\u0434\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 LTS-\u0432\u0435\u0442\u043a\u0438 Node.js 12.0 \u043f\u0440\u043e\u0434\u043b\u0438\u0442\u0441\u044f \u0434\u043e \u0430\u043f\u0440\u0435\u043b\u044f 2022 \u0433\u043e\u0434\u0430, \u0430 \u043f\u043e\u0437\u0430\u043f\u0440\u043e\u0448\u043b\u043e\u0439 LTS-\u0432\u0435\u0442\u043a\u0438 10.0 [&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-78969","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f 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