Notika par Node.js 20.0 izlaidumu, platformu t\u012bmek\u013ca lietojumprogrammu izpildei JavaScript valod\u0101. Node.js 20.0 pieder pie ilgtermi\u0146a atbalsta (LTS) zarojumiem, ta\u010du \u0161is statuss tiks pie\u0161\u0137irts tikai oktobr\u012b, p\u0113c stabiliz\u0101cijas veik\u0161anas. Atbalsts Node.js 20.x tiks nodro\u0161in\u0101ts l\u012bdz 2026. gada 30. apr\u012blim. Iepriek\u0161\u0113j\u0101s LTS versijas Node.js 18.x atbalsts ilgs l\u012bdz 2025. gada apr\u012blim, bet pirms tam Node.js 16.x l\u012bdz 2023. gada septembrim. LTS 14.x atbalsts beigsies 30. apr\u012bl\u012b, bet Node.js 19.x \u2014 1. j\u016bnij\u0101. <\/p>\n
Galvenie uzlabojumi: <\/p>\n
Pieejas p\u0101rbaudei tiek pied\u0101v\u0101ts izmantot metodi process.permission.has(), piem\u0113ram, 'process.permission.has(\u2018fs.write\u2019,'\/tmp\/test'). <\/p>\n
Node.js platformu var izmantot gan servera puses t\u012bmek\u013ca lietojumprogrammu atbalstam, gan parasto klientu un serveru t\u012bkla programmu izveidei. Lai papla\u0161in\u0101tu Node.js lietojumprogrammu funkcionalit\u0101ti, ir sagatavota liela modu\u013cu kolekcija, kas ietver modu\u013cus ar realiz\u0101ciju serveriem<\/a> un HTTP, SMTP, XMPP, DNS, FTP, IMAP, POP3 klientiem, modu\u013ciem integr\u0113\u0161anai ar da\u017e\u0101diem t\u012bmek\u013ca ietvariem, WebSocket un Ajax apstr\u0101d\u0101t\u0101jiem, datub\u0101zu (MySQL, PostgreSQL, SQLite, MongoDB) savienot\u0101jiem, veid\u0146u motorus, CSS dzin\u0113jus, kriptoval\u016btu algoritmu realiz\u0101cijas un autoriz\u0101cijas sist\u0113mas (OAuth), XML pars\u0113t\u0101jus. <\/p>\n Lai nodro\u0161in\u0101tu liel\u0101 skaita vienlaic\u012bgu piepras\u012bjumu apstr\u0101di, Node.js izmanto asynchrono koda palai\u0161anas modeli, kas balst\u0101s uz notikumu apstr\u0101di bez blo\u0137\u0113\u0161anas un callback-handler defin\u0113\u0161anu. Savienojumu multiplex\u0113\u0161anai tiek atbalst\u012bti t\u0101di pa\u0146\u0113mieni k\u0101 epoll, kqueue, \/dev\/poll un select. Savienojumu multiplex\u0113\u0161anai tiek izmantota bibliot\u0113ka libuv, kas ir virs libev Unix sist\u0113m\u0101s un IOCP Windows. Lai izveidotu pavedienu grupu (thread pool), tiek izmantota bibliot\u0113ka libeio, bet DNS piepras\u012bjumu izpilde bez blo\u0137\u0113\u0161anas ir integr\u0113ta ar c-ares. Visi sist\u0113mas izsaukumi, kas izraisa blo\u0137\u0113\u0161anu, tiek veikti pavedienu grup\u0101, un, t\u0101pat k\u0101 sign\u0101lu apstr\u0101d\u0101t\u0101ji, tie atgrie\u017e rezult\u0101tu caur nenosaukto cauruli (pipe). JavaScript koda izpilde tiek nodro\u0161in\u0101ta, izmantojot Google izstr\u0101d\u0101t\u0101 V8 dzin\u0113ja iesaisti (papildus Microsoft att\u012bsta Node.js versiju ar Chakra-Core dzin\u0113ju). <\/p>\n Node.js b\u016bt\u012bb\u0101 ir l\u012bdz\u012bgs Perl AnyEvent, Ruby Event Machine, Python Twisted ietvariem un notikumu realiz\u0101cij\u0101m Tcl, ta\u010du notikumu cikls (event loop) Node.js ir sl\u0113pts no izstr\u0101d\u0101t\u0101ja un atg\u0101dina notikumu apstr\u0101di web lietojumprogramm\u0101, kas darbojas p\u0101rl\u016bk\u0101. Rakstot lietojumprogrammas node.js, j\u0101\u0146em v\u0113r\u0101 notikumu orient\u0113t\u0101s programm\u0113\u0161anas specifika, piem\u0113ram, t\u0101 viet\u0101, lai izpild\u012btu \u201evar result = db.query(\u201eselect..\u201d);\u201d ar gaid\u0101m, kad darbs pabeigts un rezult\u0101ti apstr\u0101d\u0101ti, Node.js tiek izmantots asinkron\u0101s izpildes princips, t.i., kods tiek p\u0101rv\u0113rsts \u201edb.query(\u201eselect..\u201d, function (result) {rezult\u0101tu apstr\u0101de});\u201d, kur kontrole nekav\u0113joties p\u0101riet uz n\u0101kamo kodu, un vaic\u0101juma rezult\u0101ts tiks apstr\u0101d\u0101ts, sa\u0146emot datus. \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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