Uke wezwa I-Java ne-JavaScriptUngasho ukuthi ziyafana, noma ukuthi zingaba njalo? Le ngxoxo iyenzeka ngisho nasemihlanganweni yabantu abanolwazi ngomhlaba wekhompyutha kanye nohlelo, ngisho nalabo abasha kule ndaba.
Kunalokho Umuntu angase abuze ukuthi yini iJava neJavaScript ezifanayo, njengoba, ngaphandle kokuba yizilimi nokubizwa ngokuthi "iJava", azinalutho olunye ezifanayo..
Noma kunjalo, Ake sibone ukuthi ngayinye yazo iyini., kanye nezici zayo eziyinhloko y, kunjalo, ukuqhathanisa ukuqonda umehluko wabo.
Iyini iJava futhi yiziphi izici zayo?
IJava ulimi oluhlelayo inhloso jikelele okwakuhloswe ekuqaleni izinhlelo zokusebenza zokuklama zezamukeli ze-TV namadivayisi afakiwe, yize manje sesikuthola ngemuva kwakho konke. Ngakho-ke, inhloso yayo ivame ukuhambisana.
Kwakuhloswe futhi ukuthi uhlelo ngalunye luzobhalwa kanye kuphela bese lungasetshenziswa noma kuphingaphandle kokuphinda uhlanganise ikhodi ngokuphindaphindiwe. Njengamanje iphakathi kwezilimi zokuhlela ezithandwa kakhulu, isetshenziswa kakhulu, ikakhulukazi uma... thuthukisa isofthiwe yeklayenti-iseva.
Ine- isichazamazwi sitholakala kakhulu ku-C kanye ne-C++ngamayunithi ambalwa aphansi. Umphumela wokusetshenziswa kwayo uwukuthi uhlelo lokusebenza, oluhlanganiswe ku-bytecode, oluzosebenza kunoma yimuphi umshini we-Java virtualkungakhathaliseki ukuthi iqembu liklanywe kanjani.
Iyini iJavaScript futhi isetshenziselwani?
I-JavaScript ingenye ulimi lokuhlela, kulokhu, okuhunyushwe futhi okuqondileIzalwa kamuva futhi yenza kanjalo ngenhloso yokuthi ukuze kuvunyelwe ukusebenzisana okukhulu kumawebhusayithiokwakuyizinto eziyisicaba kakhulu futhi ezingakhangi kumsebenzisi kuze kube manje.
Ngokuvamile Isetshenziswa ohlangothini lweklayentiIsetshenziswa kakhulu kuziphequluli zewebhu (zonke ziyayisekela okwamanje) ukuthuthukisa isikhombikubona somsebenzisi namawebhusayithi. Kukhona nenguqulo eseceleni kweseva. Ukusetshenziswa kwayo kusakazeke kakhulu kangangokuthi akungabazeki ukuthi iyasebenza. isilinganiso salo mgomo, isetshenziselwa ukwengeza ukuxhumana cishe kuzo zonke izingosi.
Futhi Ihlangana nezinhlelo zokusebenza ezahlukahlukene. njengezinye izilimi zokuhlela, izinhlelo zokusebenza, noma amaseva. I-syntax yayo ifana kakhulu neye-C, ukuguqula amagama nezimiso kanye nokuwasebenzisa kwabanye, okuhlanganisa ne-Java.
Ingabe i-Java ne-JavaScript ziyinto efanayo? Yimuphi umehluko?
Njengoba sesishilo ekuqaleni, cha, I-Java ne-JavaScript azifaniZombili ziyizilimi, kanti eyesibili "yaboleka" igama layo kusukela kweyokuqala ukuze isebenzise udumo lwayo, kodwa akukho okunye. Iqiniso liwukuthi, ziyahlukahluka ngezindlela eziningi:
- Uhlobo lolimi:
- I-JavaScript iyi ihunyushweLokhu kusho ukuthi izinhlelo ezithuthukiswe kulolu hlobo lolimi amafayela ombhalo aqukethe ikhompyutha yakho nawe ngokwakho ningafunda, ehlanganiswa emakhasini e-HTML futhi ihunyushwa yisiphequluli.
- I-Java i ihlanganisiweOkusho ukuthi, ulwazi luyahlangana ukuze kudalwe ifayela elikhethekile ikhompyutha engalifunda futhi ilisebenzise.
- Izinsiza ezidingekayo:
- I-JavaScript idinga eyodwa kuphela umhleli wombhalo yekhodi kanye ne-a isiphequluli lapho imiphumela izoboniswa khona.
- Izidingo zeJava umshini obonakalayo kanye nekhithi yokuthuthukisa, equkethe amathuluzi asivumela ukuthi sakhe izinhlelo futhi phakathi kwazo kugqame "javac.exe", okuyi-compiler, "java.exe", umhumushi, kanye ne-"javadoc.exe", okuyiyona ekhiqiza amadokhumenti ekilasi.
- Izigaba zokususa ukungcola:
- I-JavaScript ine- ukuhlanzwa kwesigaba esisodwa. Ngokwalesi sizathu, Amaphutha atholakala kuphela ngesikhathi sokwenziwa yohlelo (ngaphandle kokuthi usebenzise amathuluzi athile alo).
- I-Java yenza okufanayo izikhathi ezimbili. Lokhu kusho ukuthi Esigabeni sokuqala sokuhlanganiswa, sizokwazi ukuthola amaphutha ngaphandle kwesidingo sokusebenzisa isofthiwe. Uma sesixazulule lezi zinkinga, noma yimaphi amaphutha esikhathi sokusebenza angase avele azoba nengqondo ngokwemvelo.
- Uhlobo lwezinto:
- i-JavaScript Kusekelwe kuma-prototypesNgakho-ke, ezimweni eziningi kuyadingeka ukuthi ilingise izici eziningana zezilimi ezithile zokuhlela. Iphuzu elihle ukuthi izindlela ezahlukene zokulinganisa (okuguquguqukayo, okuphoqelekile, okusebenzayo, kanye nokuqondiswe ezintweni) kwenza kube ithuluzi eliguquguqukayo kakhulu. Izinto, njengoba zijwayelekile, ziyaphindaphindwa futhi zandiswe, zabelana ngezakhiwo nezindlela.
- I-JavaScript ine- ipharadesi ebalulekile egxile ezintweni kuphelaAmakilasi achaziwe azobiza izinto.
- Ukuthayipha noma ukuguqula idatha kusuka kolunye uhlobo iye kolunye:
- I-JavaScript ibuthakathaka kulesi sici. Ama-variable ayakwazi ukuba idatha eshintsha uhlobo ngokuphindaphindiweIyaguquguquka kodwa ikhuthaza amaphutha.
- I-Java inamandla kakhulu. I-variable ngayinye inohlobo olunqunyiwe kusengaphambili; Uma sezichaziwe, azikwazi ukuguqulwa..
- I-Ambit:
- I-Java ine-scope ngebhulokhi ngayinyeI-variable ngayinye ishiya ibhlogo layo kuze kube yilapho ichazwa, iphela ekubeni yi-class noma i-instance variable. I-variables echazwe kahle ayikwazi ukuguqulwa.
- Owe-JavaScript ngu ngomsebenziUkuguquguquka kuzofinyelelwa ngaphakathi komsebenzi omenyezelwe.
- Ukufakwa kwezinto: Lena indlela yokufaka izakhi (izindlela noma izimfanelo) zento ukuze zikwazi ukubonwa kuphela lapho zibizwa, okukuvumela ukuthi unqume ukuthi yiziphi ongakwazi ukuzifinyelela, noma cha.
- I-JavaScript ayifaki.
- Yebo, i-Java iyasebenza kakhulu.
- Ukuba khona kwesikhala samagama: Yikheli elikutshela ukuthi iklasi ngalinye likuphi.
- i-JavaScript ayinakho izikhala zamagama.
- Java Sebenzisa le ndlela womsebenzi.
- I-Multhreading:
- Característica akusekelwe ngenxa yeJavaScript futhi akukho lungiselelo.
- Ukufunda ngemicu eminingi kusenza sikwazi ukwenza ukusebenzisa izinhlelo eziningana ngesikhathi esisodwa ku-Java.
- Ukusekelwa:
- I-JavaScript ikhethekile kuwe ukusetshenziswa kanye nokusetshenziswa kuzinhlelo zokusebenza zedeskithophu kanye neziphequluli.
- I-Java iyasebenza kokubili kuziphequluli kanye nasemishinini ebonakalayo zazo zonke izinhlobo
- Ukuvalwa: Ziyindalo ephuma ekumemezelweni komsebenzi ngaphakathi kwe-variable.
- i-JavaScript Bekulokhu kusebenza ngokuvalwa kwezindawookuyisici sayo esivelele kakhulu.
- Java ibafake muva nje, enguqulweni yayo yesi-8 ezingeni elingenakuqhathaniswa.
- Impikiswano eminingi:
- I-JavaScript ine- impikiswano eminingi njengesici sangaphakathi kuyo yonke imisebenzi yayo.
- Ku-Java Kuyadingeka ukukukhomba lokhu ukuze ulungiselele imisebenzi enaleso sici.
- Ukumisa:
- I-JavaScript iyi-a ulimi olujwayelekile ngu-ECMA-262.
- I-Java ayikho, Kungokwenkampani ezimele. azoyishintsha ngokuthanda kwakhe noma nini lapho ethanda.
- Ukubhala idiski:
- i-JavaScript Akakwazi ukukwenzaLokhu kwenza umsebenzisi azizwe ephephile kakhudlwana, aze abhekwe njengolimi oluphephile olusetshenziswa kunethiwekhi.
- I-Java iyakwazi yenza ukuphathwa kwefayela.
- Ezinye izici:
- I-JavaScript ayinzima kangako, okwenza kube lula, kusheshe futhi kube lula.
- I-Java inamandla kakhulu, inekhono, isindayo, iyinkimbinkimbi, futhi iphelele.
- Intuthuko: Nakuba leli phuzu lingadingeki nhlobo ukuqonda ukuthi i-Java ne-JavaScript ziyini nokuthi zisebenza kanjani, kufanele futhi kukhulunywe ukuthi azithuthukiswa yinkampani efanayo, hhayi ngebanga elide.
- I-Java ingumkhiqizo we-Sun Microsystems eyakhishwa ngo-1991.
- I-JavaScript yasungulwa yiNetscape ngo-1995.
Isiphetho esingasithola kukho konke okungenhla ukuthi ukufana kwazo kuphela ukuthi zombili ziyizilimi ezenzelwe ukuthuthukisa izingxenye zesofthiwe. Ngaphandle kwalokho, Azisebenzi ngendlela efanayo, futhi azisebenzi ngendlela efanayo, futhi azinawo umgomo ofanayo..
