Ama-Node.js kusukela ku-Basic Concepts kuya ku-Advanced Backend Mastery

Ikhaya » Python » Ama-Node.js kusukela ku-Basic Concepts kuya ku-Advanced Backend Mastery

I-Node.js isiphenduke enye yamathuluzi asetshenziswa kakhulu ekwakheni ama-backend esimanje, ama-API kanye nezinhlelo zokusebenza zesikhathi sangempela., ukuguqula i-JavaScript ibe ulimi olugcwele ngempela ongalusebenzisa kokubili kuklayenti nakuseva. Uma usuvele ubhala i-JavaScript kusiphequluli, ukufunda i-Node.js kukuvumela ukuthi uphinde usebenzise lolo lwazi ukudala konke kusukela kuzikripthi ezilula kuya ezinhlelweni ezisatshalaliswe ngezinga elikhulu ngaphandle kokushintsha izilimi.

Lo mhlahlandlela omude ukuqondisa kusukela eziyisisekelo zalokho i-Node.js eyikho, ngokufakwa, imiqondo eyinhloko, amaseva alula nama-API, kuze kube yizihloko ezithuthukisiwe njengemicu yabasebenzi, ukuqoqa, ukuphepha, ukuloga nokuthunyelwa.Umqondo uwukuthi ungayifunda njengomhlahlandlela: uzoqonda ukuthi i-Node.js isebenza kanjani ngaphansi kwe-hood, ukuthi ungakha kanjani izinsizakalo zangempela, nokuthi ungaziyisa kanjani lezo zinsizakalo ekukhiqizweni ngokusebenza okuhle nokuthembeka.

Iyini i-Node.js nokuthi kungani kufanele ukhathalele

I-Node.js iyi-runtime ye-JavaScript yomthombo ovulekile, ehlanganisa ipulatifomu ehlukahlukene esebenza ku-V8 engine ngaphandle kwesiphequluliNgesiNgisi esilula, yindawo ekuvumela ukuthi usebenzise iJavaScript ngqo ohlelweni lwakho lokusebenza esikhundleni sokungena ngaphakathi kwekhasi lewebhu kuphela. I-Node ifaka injini ye-Google Chrome V8 kanye nomtapo wolwazi ojwayelekile ocebile ukuze ukwazi ukukhuluma nohlelo lwefayela, inethiwekhi, uhlelo lokusebenza nokuningi.

Isici esiyinhloko se-Node.js imodeli yayo ye-I/O eqhutshwa yimicimbi, engavimbeliEsikhundleni sokushintsha intambo entsha yesicelo ngasinye esingenayo, uhlelo lokusebenza lwe-Node.js luvame ukusebenza ngenqubo eyodwa eyinhloko futhi lusebenzisa imisebenzi engahambisani. Lapho i-Node yenza imisebenzi ye-I/O njengokufunda kusuka kudiski, ukubuza isizindalwazi noma ukushayela i-API yangaphandle, ayihlali ingasebenzi ilinde impendulo; ibhalisa ukubizwa futhi iqhubeke nokusingatha eminye imisebenzi. Lapho i-I/O isiphelile, ukubizwa kabusha kuyafakwa emgqeni futhi kucutshungulwe yi-event loop.

Lo mklamo uvumela iseva eyodwa ye-Node.js ukuthi iphathe izinkulungwane zokuxhumeka ngasikhathi sinye ngokusetshenziswa kwezinsiza okuphansi kakhulu, ngaphandle kobunzima bokuvumelanisa izintambo kanye neziphazamiso zememori ezabiwe ezivamile kuzakhiwo ezinemicu eminingi. Ngoba imisebenzi yokuvimba iyinto ehlukile kunokuba ibe umthetho emitatsheni eminingi ye-Node, inhle kakhulu ezinhlelweni zenethiwekhi ezisebenzisa amandla aphezulu kanye nezinhlelo zesikhathi sangempela.

Enye inzuzo enkulu ukuthi i-Node.js ivumela abathuthukisi be-frontend ukuthi basebenzise kabusha amakhono abo e-JavaScript ngemuvaEsikhundleni sokufunda ulimi oluhluke ngokuphelele lwe-logic eseceleni kweseva, ungakha izinhlelo zokusebenza ezigcwele ngolimi olulodwa phakathi kwe-stack. Lokhu kusheshisa ukuhlanganiswa futhi kwenza kube lula ukubambisana phakathi kwamaqembu e-frontend kanye ne-backend.

Ama-Node.js avame ukwamukela izici ezintsha ze-ECMAScript ngokushesha. Njengoba ulawula inguqulo yesikhathi sokusebenza kuseva yakho, awulindeli ukuthi abasebenzisi bathuthukise iziphequluli zabo. Ufuna ukusebenzisa i-syntax yakamuva ye-JavaScript noma ama-API okuhlola? Ngokuvamile ungakwenza ngokufaka noma ukushintshela kunguqulo entsha ye-Node.js, futhi uma kudingeka, unike amandla amafulegi ekuqaleni.

Kungani i-Node.js Ibalulekile Ekuthuthukisweni Kwanamuhla

Kusukela ekukhishweni kwayo ngo-2009, i-Node.js isuke ekuhlolweni okuthakazelisayo yaya esakhiweni esiyinhloko sengqalasizinda yewebhu neyamafuNamuhla inika amandla yonke into kusukela kumathuluzi amancane omugqa wemiyalo kuya kuma-API amakhulu amanethiwekhi omphakathi, imikhiqizo ye-SaaS, amapulatifomu okusakaza kanye namathuluzi okubambisana.

Kuma-stack amanje, i-Node.js ifaneleka kakhulu kuma-microservices, imisebenzi engenaseva, i-edge computing kanye nokuhlangenwe nakho kwesikhathi sangempela.. Izinsizakalo ezincane, ezigxile ezibhalwe ku-Node zingakhula ngokuzimela futhi zidlale kahle nabahleli beziqukathi abanjengoKubernetes. Ngokufanayo, abahlinzeki bamafu basekela kakhulu izikhathi zokusebenza ze-Node eminikelweni yabo ye-FaaS (Functions as a Service), okwenza kube yinto efanelekile ngokwemvelo yezakhiwo eziqhutshwa yimicimbi.

Izinhlelo zokusebenza zesikhathi sangempela njengezinhlelo zokuxoxa, imidlalo yabadlali abaningi noma abahleli abasebenzisanayo bayazuza esimweni se-Node.js esiqhutshwa yimicimbiUkugcina ukuxhumana okuningi okuvulekile ngemiyalezo emincane ejwayelekile kuyindlela efanayo yomthwalo wemfanelo i-Node ephatha kahle, evame ukubhangqwa ne-WebSockets noma imitapo yolwazi efana ne-Socket.IO.

I-ecosystem ezungeze i-Node.js ingenye into ekhangayoNge-Node Package Manager (NPM), unokufinyelela kumaphakheji angaphezu kwesigidi anikeza konke kusukela kuzinhlaka ze-HTTP nama-ORM kuya emitatsheni yokuhlola, ukuqapha ukuhlanganiswa namathuluzi okwakha. Le ndlela enkulu yokusebenza, kanye nokusekelwa okuqinile komphakathi kanye namabhizinisi nge-OpenJS Foundation, kusiza ukugcina ama-Node.js efanele futhi eshintshashintsha.

Ngisho nangezikhathi zokusebenza ezintsha ezifana neDeno ezingena endaweni yesehlakalo, i-Node.js isalokhu ibusa emabhizinisini amaningi, ikakhulukazi ngenxa yamathuluzi ayo avuthiwe, imitapo yolwazi evivinywe yimpi kanye nenani elikhulu lekhodi yokukhiqiza ekhona. Uma ufuna ikhono elisebenzayo nelisebenzisekayo lomsebenzi wangemuva, i-Node.js isalokhu iyindlela eqinile kakhulu.

Izimfuneko kanye Nendlela Yokufunda ye-Node.js

Ngaphambi kokuthi ungene shí ku-Node.js, kufanele ukhululeke ngemiqondo eyinhloko ye-JavaScriptLokho kufaka phakathi izinto eziguquguqukayo, imisebenzi, izinto, ama-array, futhi ikakhulukazi amaphethini angavumelani njenge-callbacks, izithembiso kanye ne-async/await. I-Node incike kakhulu kukhodi ye-async, ngakho-ke ukuqonda ukuthi ukusebenza kuhamba kanjani lapho imisebenzi ingaqedi ngokushesha kubalulekile.

Kuyasiza futhi ukwazi izisekelo ze-HTML ne-CSS uma uhlela ukwakha izinhlelo zokusebenza zewebhu ezigcwele i-stackNgisho noma i-Node iphatha i-backend logic, uzovame ukunikeza amafayela e-HTML, CSS kanye ne-JavaScript kusiphequluli noma unikeze imibono usebenzisa amathempulethi noma uhlaka lwe-frontend.

Ukujwayelana nomugqa womyalo namathuluzi afana ne-Git kwenza ukusebenza namaphrojekthi e-Node kube lula kakhuluUkufaka ukuncika, ukusebenzisa izikripthi, ukusetha iziguquguquko zemvelo kanye nokufaka izinhlelo zokusebenza kuvame ukwenzeka ngemiyalo yesiphelo, ngakho-ke ukukhululeka endaweni evulekile kuzokusindisa ukukhungatheka okukhulu.

Indlela yokufunda enhle ivame ukuqala ngokufaka i-Node.js, ukuqonda i-runtime kanye ne-event loop, nokubhala iseva encane ye-HTTPUkusuka lapho, udlulela ekusebenziseni amamojula ayisisekelo (uhlelo lwamafayela, i-OS, i-HTTP), wakha ama-API amancane, bese ufaka kancane kancane uhlaka olufana ne-Express, uhlanganisa izizindalwazi, futhi ekugcineni ubhekane nezinkinga zokukhiqiza ezifana nokuphepha, ukuloba, ukuqapha kanye namasu okusebenzisa.

Izinhlelo eziningi zokuqeqesha kanye nezikole zifaka i-Node.js njengensika eyinhloko yezifundo zabo zangemuva noma ze-full-stackNgokuvamile ziqala ngezisekelo futhi ziqhubekela phambili ezimweni zokusetshenziswa ezithuthukisiwe njenge-API ekwazi ukukhuliswa, ukuqinisekiswa, ukulungiswa kokusebenza kanye nokusetshenziswa kwe-cloud-native, ngokuvamile zisebenzisa ukufunda okusekelwe kumaphrojekthi ukuze ukwazi ukwakha izinhlelo zokusebenza zangempela endleleni.

Ukufaka Nokuphatha i-Node.js

Ukufaka ama-Node.js emshinini wakho kulula kakhulu: ungayilanda ngqo kuwebhusayithi esemthethweni noma usebenzise umphathi wenguqulo. Ukulanda okusemthethweni kuyatholakala ku-Windows, macOS kanye ne-Linux, futhi ngokuvamile uzobona izinketho ezimbili eziyinhloko: i-LTS (Usekelo Lwesikhathi Eside) kanye nokusakaza kokukhishwa kwamanje noma "kwakamuva".

Kwabathuthukisi abaningi, inguqulo ye-LTS iyinto ezenzakalelayo enengqondo, ikakhulukazi emsebenzini wokukhiqizaUkukhishwa kwe-LTS kuthola ukulungiswa kwamaphutha kanye nezibuyekezo zokuphepha isikhathi eside, okwenza kube okuzinzile nokubikezelwayo. Uma sekulandiwe, umfakisi ukukuqondisa ngezinyathelo, futhi ngemizuzu embalwa usukulungele ukusebenzisa i-JavaScript kusuka ku-terminal yakho.

Ngemva kokufaka, ungaqinisekisa ukuthi konke kuyasebenza ngokuhlola izinguquloVula i-terminal bese usebenzisa into efana nale node -v futhi npm -vYomibili imiyalo kufanele iphrinte inombolo yenguqulo; uma ikwenza, usethiwe.

Uma usebenza kumaphrojekthi amaningi anezidingo ezahlukene zeNode, ukusebenzisa umphathi wenguqulo cishe kuyimpoqoAmathuluzi afana ne-nvm (ye-macOS ne-Linux), i-nvm-windows noma i-Volta akuvumela ukuthi ufake futhi ushintshe phakathi kwezinguqulo ze-Node ngemiyalo elula. Isibonelo, nge-nvm ungase usebenzise nvm install 20 ulandelwa ngu nvm use 20 ukugxumela enguqulweni ethile enkulu ngaphandle kokuthinta amanye amaphrojekthi.

Ngokuhamba kwesikhathi, inguqulo esebenzayo ye-LTS ye-Node.js iyashintsha, kodwa ukuhamba komsebenzi kuhlala kufana: faka isikhathi sokusebenza, qinisekisa amathuluzi akho, futhi, uma kudingeka, thuthukisa ngomphathi wenguqulo oyikhethile ukuze ukwazi ukusizakala ngezici ezintsha ze-ECMAScript kanye nokuthuthukiswa kwesikhathi sokusebenza.

Ukwakhiwa Okuyinhloko: Isikhathi Sokusebenza, I-Event Loop kanye ne-I/O

I-Node.js akuyona ulimi noma uhlaka; yindawo exhumanisa injini ye-V8 JavaScript namakhono ezinga lesistimu.. I-V8 isebenzisa i-JavaScript yakho, kuyilapho i-Node iveza indawo ye-API evumela ikhodi yakho ukuthi isebenze nesistimu yamafayela, amasokhethi enethiwekhi, izinqubo zezingane, i-cryptography, imifudlana nokuningi.

Okwakhelwe ngaphakathi fs imodyuli, isibonelo, ikuvumela ukuthi ufunde futhi ubhale amafayela, uhlole iziqondisi futhi ulawule izindlela. Ungasebenzisa ama-logger, amathuluzi okungenisa/ukuthumela, izinhlelo zokusebenza zokuthatha amanothi noma izici ze-backend ezigcina idatha kudiski, konke kusetshenziswa i-JavaScript. Imisebenzi ivame ukutholakala ngezindlela ezihambisanayo nezingenasilinganiselo, kodwa izinguqulo ze-async ziyisinqumo esikhethwayo ezinhlelweni eziningi zeseva.

Amakhono okuxhumana ayatholakala ngamamojula ayisisekelo afana http, https nama-API esokhethi asezingeni eliphansi. Ngemigqa embalwa nje yekhodi, ungavula iseva ye-HTTP, uphendule izicelo, ithrafikhi ye-proxy noma wakhe amaseva amancane angokwezifiso akhuluma ngezinye izinqubo. Lokhu kulawula okuphansi kunamandla, yize abathuthukisi abaningi ekugcineni bekusonga ngezinhlaka ezifana ne-Express noma i-Fastify.

Ama-Node.js afaka namamojula afana nalawa os ukuze kusetshenziswe uhlelo lokusebenza. Ungathola ulwazi mayelana nama-cores e-CPU, inkumbulo, isikhathi sokusebenza kanye nemininingwane yesikhulumi, okuwusizo kakhulu ekuxilongeni, ekuhlolweni kwezempilo, kuma-ejenti okuqapha noma kumasevisi e-CLI adinga ukuzivumelanisa nendawo yawo.

Ngaphansi kwe-hood, okwenza ama-Node.js azizwe ehlukile yi-event loop. I-event loop iyindlela eyinhloko ehlola njalo ama-callback alindile, ama-timer, imisebenzi ye-I/O eqediwe kanye neminye imisebenzi ebekwe emgqeni, bese iyenza ngezigaba ezahlukene. Ama-timer ahlelwe nge setTimeout futhi setInterval isebenza ngesigaba esisodwa, ama-callback amaningi e-I/O asebenza kwesinye, kanye nemisebenzi ebhaliswe nayo setImmediate banesigaba sabo futhi. Lokhu kuhlelwa akwenzi ikhodi ibe lula ngokuyisimangaliso, kodwa kuvumela ukuvumelana okusebenzayo ngaphandle kokuvimba intambo eyinhloko noma nini lapho uncika kuma-API angavumelani.

Omunye umqondo obalulekile umehluko phakathi kokusebenza kokuvimba nokungavimbeliUma ubiza indlela yokuvumelanisa efana fs.readFileSync, yonke inqubo iyama kuze kube yilapho idatha ifundwa kudiski. Ngokuphambene nalokho, i-asynchronous fs.readFile iqala ukusebenza bese ibuya ngokushesha, futhi ukuphinda ushaye ucingo noma isithembiso sakho kuyaxazululeka kamuva lapho idatha ifika. Kumaseva asebenzisa i-high-throughput, ukusebenzisa i-I/O engavimbeli kubalulekile ekugcineni i-event loop iphendula.

Amamojula, Amaphakheji kanye ne-Node.js Ecosystem

I-Node.js ikukhuthaza ukuthi uhlukanise ikhodi yakho ibe amamojula amancane, angasetshenziswa kabushaLawa mamojula angakhiwa ngaphakathi (njenge- fs, path, crypto), amafayela achazwe ngumsebenzisi ngaphakathi kwephrojekthi yakho, noma ukuncika komuntu wesithathu okufakwe kusuka ku-NPM. I-Modern Node isekela kokubili i-CommonJS (require/module.exports) kanye namaModule e-ES omdabu (import/export), njengoba ama-ES Modules manje ebhekwa njengendlela ejwayelekile kumaphrojekthi amaningi amasha.

I-Node Package Manager (NPM) iyinhloko yale nqubo ye-modularNgemiyalo embalwa ungaqala iphrojekthi, wengeze ukuncika, ukubuyekeze noma ukususe. Amathuluzi afana ne-Yarn kanye ne-pnpm ahlinzeka ngezindlela zokusebenza ezihlukile ezigxile esivinini, ukuthembeka kanye nokusebenza kahle kwesikhala sediski, kodwa konke kuzungeza umqondo ofanayo oyisisekelo: iphrojekthi yakho imemezela ukuncika kwayo ku package.json, bese umphathi wephakheji ekhiya futhi ewafaka.

Your package.json ifayela lingaphezu nje kohlu lokuthembela. Ichaza igama lephrojekthi yakho, izikripthi, izindawo zokungena kanye nezindawo ezizungezile. Izinkambu ezifana dependencies futhi devDependencies hlukanisa phakathi kwamaphakheji adingekayo ngesikhathi sokusebenza kanye nalawo adingeka kuphela emisebenzini yokuthuthukisa (ukuhlola, ukufaka ama-lint, ukwakha). scripts isigaba sikuvumela ukuthi uchaze imiyalo yangokwezifiso engasetshenziswa ngayo npm run, ukwenza imisebenzi ibe lula njengokuqala iseva, ukuqhuba izivivinyo noma ukwakha izimpahla.

Ukuceba kwe-Node ecosystem kusho ukuthi cishe njalo ungathola umtapo wolwazi wokuxazulula inkinga, kungakhathaliseki ukuthi lokho kuphatha ubuqiniso, ukuhlanganisa isizindalwazi esithile, ukukhiqiza amadokhumenti e-API noma ukusebenzisa ikhodi yakho ngama-metric. Nakuba lokhu kunamandla, kusho nokuthi kufanele ukhethe ukuncika ngokucophelela futhi ukugcine kubuyekeziwe ukuze unciphise ingozi yokuphepha.

Ukwakha Iseva Yakho Yokuqala ye-HTTP nge-Node.js

Indlela ejwayelekile yokuzizwa ukhululekile nge-Node.js ukwakha iseva encane ye-HTTP ephendula ngomyalezo olulaUkusebenzisa okwakhelwe ngaphakathi http imodyuli, udala isibonelo seseva, unamathisele isiphathi sesicelo, bese usitshela ukuthi silalele echwebeni elithile kanye ne-host.

Ku-callback yesiphathi sesicelo, i-Node ikunikeza izinto ezimbili ezibalulekile: isicelo kanye nempenduloInto yesicelo iqukethe imininingwane mayelana nalokho iklayenti elikucelayo — i-URL, indlela ye-HTTP, izihloko kanye nomzimba ongakukhetha. Into yempendulo yilokho okusebenzisayo ukuthumela idatha emuva, ukusetha amakhodi wesimo nokuchaza izihloko ezifana Content-Type.

Ngokuvamile, uzosetha ikhodi yesimo se-HTTP ibe yinto efana ne-200 ukuze uphumelele, kanye nezinhloko ezichaza uhlobo lokuqukethwe okuthumelayo.Uma usubhale okuqukethwe kwakho ekusakazweni kwempendulo, shayela ucingo res.end() izimpawu zokuthi impendulo isiphelile. Ukuzulazula uye ku- http://localhost:3000 kusiphequluli sakho (noma ukusebenzisa ithuluzi elifana ne-curl) kuzobe sekukhombisa umlayezo okhonzwa uhlelo lwakho lwe-Node.

Ukusebenzisa lolu hlobo lweseva eyisisekelo kukhombisa nokuthi i-Node iqhubeka kanjani isebenza ngisho nalapho iphatha ithrafikhi yenethiwekhi. Ukuxhumeka okusha ngakunye kubangela ukuphinda kusebenze, kodwa ngenxa yokuthi imisebenzi ye-I/O ayivimbeli, iseva ingahlanganisa ukuxhumana okuningi okuvulekile kahle ngaphandle kokudinga intambo ngesicelo ngasinye.

Uma ukhetha i-syntax yesimanje yeJavaScript, ungabhala iseva yakho usebenzisa ama-ES Modules esikhundleni se-CommonJS. Kuleso simo, uzovame ukusetha "type": "module" e lakho package.json noma usebenzise i- .mjs isandiso sefayela, bese usebenzisa import izitatimende eziphezulu kumafayela akho.

Izandla: I-API Yamanothi Alula E-REST Ngaphandle Kwezinhlaka

Uma usukhululekile ngeseva ethi “Hello World”, isinyathelo esilandelayo esihle ukwakha i-REST API encane usebenzisa amamojula ayinhloko e-Node kuphela.. Iphrojekthi encane yakudala iyi-API yokuthatha amanothi ekuvumela ukuthi udale, ubhale futhi ususe amanothi agcinwe kufayela le-JSON. Lo msebenzi ukufundisa ukuthi ukuqondisa kusebenza kanjani, ukuthi ungahlaziya kanjani imizimba yesicelo nokuthi ungasebenza kanjani nohlelo lwefayela ukuze uqhubeke.

Iphrojekthi yakho ingase ibe namafayela amabili kuphela: ifayela elilodwa le-JSON lokugcina idatha kanye nefayela elilodwa le-JavaScript le-logic yesevaIfayela le-JSON liqala njenge-array engenalutho emele amanothi angenawo. Iskripthi seseva siyangenisa http ukusingatha izicelo, fs futhi path ukufunda nokubhala idatha, kanye ne-URL parser yokukhipha izindlela namapharamitha.

Ungasebenzisa imisebenzi yomsizi efunda ifayela le-JSON ngendlela engavumelanisiwe bese ubuyisela uhlu lwamanothi oluhlaziyiwe, kanye nenye ebhala uhlu olubuyekeziwe emuva kudiskiUkugoqa lokhu ngezithembiso (noma ukusebenzisa i-async/await) kugcina ukugeleza kulawuleka ngenkathi kuqinisekiswa ukuthi awuvimbeli i-event loop ngemisebenzi yefayela ehambisanayo.

Ngoba awuthembeli ku-middleware kusuka kuhlaka, uzohlola ngesandla umzimba wesicelo ongenayoLokho kusho ukubhalisela i- data umcimbi ekusakazweni kwesicelo, uhlanganisa izingcezu zibe yintambo, bese uyihlaziya njenge-JSON uma end Umcimbi uyasha. Uma ukuhlaziya kwehluleka, ubuyisela impendulo yephutha ekhombisa i-JSON engavumelekile.

Ukuphinda ushayele kweseva okuyinhloko kungalandela indlela ye-HTTP nendlela. Isibonelo, a GET isicelo sokuthi /notes ibuyisela uhlu lwawo wonke amanothi, POST kuya /notes ingeza inothi elisha (ukunikeza i-ID elula ehlukile, mhlawumbe usebenzisa Date.now()), Futhi DELETE kuya /notes/:id isusa inothi elinaleyo ID uma likhona. Igatsha ngalinye lisetha amakhodi esimo, izihloko kanye nomzimba njengoba kufanele, futhi indlela engaziwa iphumela empendulweni engu-404.

Ukuze uvivinye le API, ungasebenzisa i-curl noma iklayenti le-REST njenge-Postman. Ukudala amanothi, ukuwafaka ohlwini nokuwasusa kuzokunikeza umuzwa oqondile wokuthi izenzo ze-HTTP zihlangana kanjani nemisebenzi ye-CRUD. Ngemva kokuqeda le phrojekthi, uzoba nemodeli yengqondo eqinile yalokho okwenziwa yizinhlaka ezifana ne-Express ngaphansi kwe-hood, okukwenza uqiniseke kakhulu uma uqala ukuthembela kulezo zifinyezo.

Izinhlaka: Express, Fastify, NestJS kanye Nangaphandle

Nakuba ukwakha amaseva kusukela ekuqaleni kufundisa, izinhlelo zokusebenza eziningi ze-Node.js zokukhiqiza zisebenzisa izinhlaka ukusheshisa intuthuko kanye nokuphoqelela isakhiwoI-Express.js iyisinqumo esivamile: uhlaka oluncane, oluguquguqukayo olufaka i-routing, i-middleware kanye ne-API ehlanzekile phezu kwe-Node's core http module.

I-Express yethula umqondo wemisebenzi ye-middleware ecubungula izicelo ngendlela ehlelekile. I-middleware yezinga lohlelo lokusebenza isebenza kuzo zonke izindlela, i-middleware yezinga lomzila inamathiselwe kumaqembu athile ezindlela, kanye namaphutha okusingatha amaphutha okubanjwa kanye nokufometha kwe-middleware. Uthola futhi abasizi abakhelwe ngaphakathi abanjengo express.json() ukuze kuhlolwe imizimba ye-JSON kanye nesistimu enkulu ye-middleware yangaphandle yemisebenzi efana nokuqinisekisa, ukuloba, ukukhawulela amazinga, ukulayishwa kwamafayela nokuningi.

Naphezu kokuthandwa kwayo, i-Express akuyona yodwa umdlalo edolobheni. Amafreyimu afana ne-Fastify agxila ekusebenzeni okuluhlaza kanye nomklamo wesimanje we-async/await-first, okukunikeza i-throughput engcono ngenkathi usazizwa ujwayelene. I-NestJS ithatha indlela egxile kakhulu, ephefumulelwe yi-Angular ngabahlobisi, i-dependency injection kanye ne-TypeScript ngokuzenzakalelayo, okwenza ikhange kumaphrojekthi amakhulu, asezingeni lebhizinisi adinga iziqondiso eziqinile zokwakha.

Ukukhetha phakathi kwalezi zinhlaka kuncike ezidingweni zakho kanye nezintandokazi zakhoI-Express ilula kakhulu kwabaqalayo futhi ibhalwe kabanzi, i-Fastify inhle kakhulu uma ukhathalela yonke into esebenzayo, futhi i-NestJS iyakhanya uma ufuna isakhiwo kanye nokugcinwa kahle kuma-codebase amakhulu. Izindaba ezinhle ukuthi zonke zakhela phezu kwezisekelo ezifanayo ze-Node.js osuzifundile kakade.

Noma ngabe yiluphi uhlaka olukhethayo, ukuqonda imodeli ye-Node eyisisekelo kuyazuzisa. Kukusiza ukuthi ulungise izinkinga zokusebenza ezinzima, ucabange ngokuhambisana kwemali, futhi ugweme amaphethini aphikisanayo angonakalisa buthule ukuphendula kohlelo lwakho lokusebenza ngaphansi komthwalo.

Ukusakaza, Ama-Buffer kanye Nokuphathwa Kwedatha Okuphumelelayo

Uma uhlelo lwakho lokusebenza ludinga ukusebenza nedatha eningi, ukusakazwa kwe-Node.js kungumngane wakho omkhuluEsikhundleni sokulayisha ifayela noma impendulo yonke kwimemori ngesikhathi esisodwa, ukusakazwa kukuvumela ukuthi ucubungule idatha kancane kancane njengoba itholakala, okunciphisa ukusetshenziswa kwememori kanye nokubambezeleka.

I-Node ichaza izinhlobo eziningana zemifudlana: imifudlana efundekayo, imifudlana ebhalwe phansi, imifudlana emibili kanye nemifudlana yokuguqula. Ukusakaza okufundekayo, njengokufundwa kwamafayela noma izicelo ze-HTTP ezingenayo, kuhlinzeka ngezingcezu zedatha ongazisebenzisa. Ukusakaza okubhaliwe, njengokubhala kwamafayela noma izimpendulo ze-HTTP, kwamukela idatha oyithumelayo. Ukusakaza okuphindwe kabili kungafunda futhi kubhale, kuyilapho ukusakaza okuguqulayo kuthatha okokufaka, ukukuguqula nokukhipha ifomu elisha, eliwusizo kakhulu ekucindezelweni, ekubethelweni noma emipayipini yokuguqulwa kwedatha.

Ama-buffer angomunye umqondo oyinhloko, amelela idatha engahluziwe ye-binaryNoma nini lapho i-Node ixhumana nemifudlana ye-binary (amafayela, amasokhethi, njll.), isebenzisa ama-buffer ukubamba izingcezu zama-byte. Ungaguqula lawa ma-buffer ngqo noma uwaguqulele kuma-strings noma uwaguqulele kusuka kuma-string njengoba kudingeka, okubalulekile lapho ubhekene namaphrothokholi e-binary, amafomethi efayela noma imisebenzi ebalulekile yokusebenza.

Ngokuhlanganisa imifudlana nama-buffer, ungakha amapayipi acubungula amasethi edatha amakhulu ngaphandle kokuphazamisa ukusetshenziswa kwememori yakhoIsibonelo, ukusakaza ifayela levidiyo nge-transform eliyicindezela ngokushesha kungandiswa kakhulu kunokufunda lonke ifayela, uliguqule, bese uthumela umphumela ngesikhathi esisodwa.

Lezi zinto zokuqala ziba zibaluleke kakhulu kumaseva asebenza kahle, ama-proxies abuyela emuva, amapayipi emidiya nanoma yiluphi uhlelo oludinga ukuhambisa imithwalo emikhulu yokukhokha ngendlela ephumelelayo.Futhi ziyisisekelo semitapo yolwazi eminingi esezingeni eliphezulu, ngakho-ke ukuyiqonda kukusiza ukuthi ucabange ngendlela idatha egeleza ngayo kuzinhlelo zakho zokusebenza.

Ukulinganisa: Ukuhlanganisa, Imicu Yabasebenzi kanye Nezakhiwo Zesevisi

Nakuba i-Node.js isebenzisa umucu owodwa oyinhloko wokusebenza kweJavaScript, izinhlelo zokusebenza zanamuhla zivame ukudinga ukusizakala ngama-core amaningi e-CPUUkuze kulinganiswe ama-core, i-Node inikeza izindlela ezifana nokuqoqa kanye nezintambo zesisebenzi, ngayinye ifanele izinhlobo ezahlukene zemithwalo yemisebenzi.

Imojula yeqoqo ikuvumela ukuthi udale izinqubo eziningi ze-Node.js ezabelana nge-port efanayo yesevaInqubo eyinhloko isabalalisa ukuxhumana okungenayo kuzo zonke izinqubo zabasebenzi, ikuvumela ukuthi usebenzise wonke ama-core e-CPU atholakalayo ukuze uphathe ithrafikhi enkulu ye-I/O. Lokhu kulungele ama-API e-HTTP angenasimo lapho inqubo ngayinye ingaphatha izicelo ngokuzimela.

Ngakolunye uhlangothi, izintambo zesisebenzi zihlinzeka ngezintambo eziningi zangempela ngaphakathi kwenqubo eyodwa ye-Node.js. Zenzelwe ngqo imisebenzi eboshwe yi-CPU njengokucubungula izithombe, ukubala okunzima, ukucindezelwa kwedatha, i-hashing noma ukubethela. Ukulayisha umsebenzi onjalo emicu yezisebenzi kuvimbela lezo zibalo ekuvimbeleni i-loop yemicimbi futhi kugcina uhlelo lwakho lokusebenza luphendula.

Izinqubo zezingane zigcwalisa la mathuluzi ngokukuvumela ukuthi usebenzise imiyalo yangaphandle noma uhlukanise izikripthi zeNode. Ungazisebenzisa ukwenza izinsiza zesistimu, ukuhlela izinyathelo zokwakha noma ukuhlukanisa imithwalo yemisebenzi engathembekile. Kodwa-ke, ngoba ukusebenzisa imiyalo yegobolondo kungaletha izingozi zokuphepha, kufanele uqinisekise okufakwayo ngokucophelela ukuze ugweme ubuthakathaka bokufaka umyalo.

Ezingeni eliphezulu, ukwakheka kwakho konke kungalandela amaphethini amaningana: izinhlelo zokusebenza ze-monolithic, ama-microservices noma imisebenzi engenaseva. Amaqembu e-monolith amaningi abonakala ku-codebase eyodwa kanye neyunithi yokusabalalisa. Ama-Microservices ahlukanisa ukusebenza kube amasevisi amancane, angasebenziseka ngokuzimela axhumana ngenethiwekhi. Imisebenzi engenaseva iyaqhubeka ngokufaka izingcezu ngazinye ze-logic njengemisebenzi yesikhashana ephethwe yipulatifomu yamafu. Ama-Node.js asebenza kahle kuzo zonke lezi zimo, kodwa isu lakho lokukhulisa kanye namathuluzi kuzohluka kuye ngokuthi ukhetha yiphi.

Ukuphepha, Ukugcinwa Kwemithi, Ukuqapha kanye Nokukhiqizwa Kwezinto Ezikhathazayo

Ukwakha into esebenza kwi-laptop yakho kuyinto eyodwa; ukusebenzisa isevisi ye-Node.js ethembekile nephephile ekukhiqizeni kuyinto enye.Njengoba udlulela ngale kwezibonelo, udinga ukubhekana nokucushwa, imikhuba emihle yokuphepha, ukuloba, ukuqapha kanye namasu okusebenzisa.

Ukuphathwa kokucushwa kuqala ngeziguquguquko zemvelo futhi kuvame ukusebenzisa abasizi abanjengo-dotenv ngesikhathi sokuthuthukiswa kwendawoNakuba i-dotenv ilula ukulayisha iziguquguquko ezivela kufayela elisemshinini wakho, ekukhiqizeni ngokuvamile kungcono ukuthembela ezinhlelweni zokuphatha eziyimfihlo zepulatifomu yakho (isibonelo, i-AWS Secrets Manager noma i-HashiCorp Vault) ukuze igcine iziqinisekiso kanye nokulungiselelwa okubucayi ngokuphephile.

Ukuze kuvikelwe, i-HTTPS kufanele ibe yinto ezenzakalelayo kunokuba kube yinto ecatshangelwe kamuva. Ukucushwa kwe-TLS okufanele, ama-cipher suites aqinile kanye nokuphathwa kokhiye okuphephile kuyizidingo eziyisisekelo. Ngaphezu kwalokho, ukuqinisekiswa kokufaka kanye nokuhlanzwa kubalulekile ukuvimbela ukuhlaselwa ngokufakwa, futhi ukuqinisekiswa okuqinile kanye nokulawula ukugunyazwa kufanele kuvikele ama-endpoints abucayi.

Kuzinhlaka ze-HTTP, i-middleware efana ne-Helmet ingasetha izihloko zokuphepha ezinengqondo ngokuzenzakalelayo. Ukunciphisa izinga le-middleware kusiza ukunciphisa ingozi yokuhlaselwa ngamandla amakhulu kanye nethrafikhi ehlukumezayo, kuyilapho kuhlolwa ukuncika ngemiyalo efana npm audit qokomisa ubuthakathaka obaziwayo kumaphakheji akho ukuze ukwazi ukuwalungisa noma ukuwabuyekeza ngokushesha.

Plain console.log kulungile ekulungiseni amaphutha ngokushesha, kodwa izinhlelo zokukhiqiza ziyazuza ekulobeni okuhlelekile. Amalabhulali afana ne-pino ne-winston akuvumela ukuthi ukhiphe amalogi ngamafomethi ahlelekile njenge-JSON, okwenza kube lula ukuwaqoqa, ukuwahlunga nokuhlaziya ngamathuluzi okuphatha amalogi. Ukufaka ama-ID esicelo, ama-ID omsebenzisi kanye nolwazi oluhambisana nomongo kumalogi akho kuthuthukisa kakhulu ikhono lakho lokulandelela izinkinga.

Ukuqapha nokubona kukuvumela ukuthi uqonde ukuthi izinhlelo zakho zokusebenza ze-Node.js ziziphatha kanjani ngesikhathi sangempelaAbaphathi bezinqubo ezifana ne-PM2 basiza ukugcina uhlelo lwakho lokusebenza lusebenza, ukuphatha ukuqala kabusha kanye nokuveza amamethrikhi ayisisekelo. Ukuze ubone ngokujulile, ungahlanganisa amathuluzi okuqapha ukusebenza kwesicelo (i-APM) njenge-Datadog noma i-New Relic, futhi usebenzise amapulatifomu okulandelela amaphutha njenge-Sentry ukuze uthwebule umkhondo we-stack kanye nomongo noma nini lapho kukhona okungahambi kahle.

Amaqembu anamuhla asebenzisa i-OpenTelemetry ngokwandisa izilinganiso ezijwayelekile kanye nokulandelela okusatshalaliswayoLokhu kwenza kube lula ukulandela isicelo esisodwa njengoba sigeleza kumasevisi amaningi (ngokuvamile kuzo zonke izilimi ezahlukene), okuyinto ebalulekile ekulungiseni izinkinga ezindaweni eziyinkimbinkimbi ze-microservice.

Isakhiwo Sephrojekthi, Ukuhlolwa Nokusetshenziswa Kwayo

Njengoba izinhlelo zakho zokusebenza ze-Node.js zikhula, ukuhlela ikhodi yakho ngokucabangela kuba yinto ebalulekileIphethini evamile ukuhlukanisa abalawuli, imizila, amamodeli, izinsizakalo kanye nemisebenzi yokusetshenziswa kumarekhodi abo, ngokuvamile ngaphansi kwe-main src ifolda. Lokhu kugcina i-logic ehlobene iqoqwe ndawonye futhi kwenza iphrojekthi ibe lula kakhulu kubabhali abasha.

Amathuluzi ekhwalithi yekhodi afana ne-ESLint ne-Prettier asiza ukugcina isitayela esifanayo eqenjini lonke. I-ESLint ibamba amaphutha avamile futhi iphoqelele imithetho, kuyilapho i-Prettier igxile ekufometheni. Ukuyisebenzisa ngokuzenzakalelayo—kungaba ngama-pre-commit hooks noma kumzila wakho wokuhlanganisa oqhubekayo—kuvimbela izinkinga zesitayela ekubeni yisiphazamiso ekubuyekezweni kwekhodi.

Ukuhlolwa okuzenzakalelayo akunakuxoxiswana ngakho kumaphrojekthi angathi sína. Izinhlaka ezifana ne-Jest zinikeza indawo yokuhlola ephelele enezisho, ama-mock, imibiko yokumboza kanye nezindlela zokubuka. Ezinye ezifana ne-Mocha ne-Chai zinikeza ezinye izindlela zokulinganisa. Ukuhlolwa kweyunithi, ukuhlolwa kokuhlanganiswa, kanye nokuhlolwa kokuphela kokuphela kukunikeza ukuqiniseka kokuthi izinguquko aziphuli ngokungalindelekile ukuziphatha okukhona.

Izinhlelo ze-Continuous Integration/Continuous Delivery (CI/CD) ezifana ne-GitHub Actions noma i-GitLab CI zihlela imisebenzi yakho yokuhlola nokusabalalisa. Ukusunduza ngakunye kungabangela ukuncibilika, ukuhlola nokwakha, futhi uma uphumelela ungakusebenzisa ngokuzenzakalelayo ezindaweni zokukhiqiza noma zokukhiqiza. Lokhu kunciphisa ama-feedback loops futhi kunciphisa amaphutha abantu ngesikhathi sokukhishwa.

Ekusetshenzisweni, ukufakwa kweziqukathi nge-Docker sekuyindlela ejwayelekileUkupakisha uhlelo lwakho lokusebenza lwe-Node.js kanye nokuxhomekeka kwalo esithombeni kuqinisekisa ukuziphatha okuhambisanayo kuzo zonke izindawo. Ungasebenzisa lezi ziqukathi kumasevisi afana ne-Kubernetes ukuze uhlele futhi ulinganise, noma uzisebenzise kumapulatifomu eziqukathi ezilawulwayo noma izikhathi zokusebenza kweziqukathi ezingenaseva kuye ngezidingo zakho.

Ukubhala phansi ama-API akho kanye nawangaphakathi nakho kuyingxenye yokusethwa kwe-Node.js evuthiweAmathuluzi afana ne-Swagger/OpenAPI akuvumela ukuthi uchaze ama-REST endpoints ngefomethi efundeka ngomshini, engakhiqiza amadokhumenti asebenzisanayo nama-SDK amaklayenti. Ukuze uthole amadokhumenti angaphakathi emisebenzi namamojula, amazwana esitayela se-JSDoc asiza ithimba lakho (kanye nomuntu wakho wesikhathi esizayo) ukuthi baqonde ngokushesha ukuthi izingcezu zihlangana kanjani.

Ukuhlanganisa yonke le mikhuba—isakhiwo esiqinile, ukuhlolwa okuzenzakalelayo, ukuthunyelwa okuqinile kanye namadokhumenti acacile—kuguqula ama-Node.js abe yithuluzi lokubhala ngokushesha abe isisekelo esithembekile sezinhlelo zokusebenza ezihlala isikhathi eside nezinwebekayo.. Ngomqondo oyinhloko wesikhathi sokusebenza oqhutshwa yimicimbi, i-ecosystem ecebile kanye nokusekelwa okuqinile komphakathi, ukwazi kahle ama-Node.js kusukela emiqondweni eyisisekelo kuya kumaphethini athuthukile kuvula amathuba amaningi ekuthuthukisweni kwesofthiwe yesimanje.