Isiqulatho[Fihla][Bonisa]
- 1. Ithetha ntoni iJavaScript kuwe?
- 2. Xela iiparadigm ezimbini ezisisiseko zophuhliso lweJavaScript.
- 3. Yintoni eyahlula iJavaScript kwiJava?
- 4. Ziziphi iifom zedatha ezixhaswa yiJavaScript?
- 5. Ziziphi iimpawu enazo iJavaScript?
- 6. Ziziphi iingxaki zokusebenzisa iJavaScript?
- 7. Ikuvumela njani iJavaScript ukuba wakhe into?
- 8. KwiJavaScript, ulwakha njani uluhlu?
- 9. Indlela yokuchaza umsebenzi wegama kwiJavaScript kwaye yintoni na?
- 10. KwiJavaScript, chaza ukunyuswa.
- 11. Ingaba ibandakanya ntoni imida yeJavaScript?
- 12. Yeyiphi ekhawulezayo, iscript seASP okanye iJavaScript?
- 13. Chaza ukuba ilifa leprototypal lahluke njani kwilifa lakudala.
- 14. Bhala iprogram eya kongeza amacandelo amatsha ngamandla.
- 15. Callback: Yintoni?
- 16. Ingalungiswa njani inkqubo yeJavaScript?
- 17. Ukuvalwa: Yintoni? Yenza umzekeliso.
- 18. Ziziphi iindlela ezikhoyo zokubandakanya ikhowudi yeJavaScript kwifayile ye-HTML?
- 19. Zisebenza njani izibali-xesha kwiJavaScript?
- 20. Zithini iimbono zakho malunga namaqebengwana?
- 21. Umntu angawenza njani amaqebengwana?
- 22. Zithini iJavaScript eziguquguqukayo zamagama iindibano?
- 23. Yintoni eyenza ukwahlukana nokwahlukana komnye nomnye?
- 24. Kutheni kukho imisebenzi yokuzenzela?
- 25. Yintoni eyahlula ipropati kwiimpawu?
- 26. KwiJavaScript, yintoni imisebenzi yotolo?
- 27. Luluphi ulwimi oluchwetheziweyo?
- 28. KwiJavaScript, nceda uchaze NEGATIVE INFINITY.
- 29. Yintoni eyahlula i-undefined from null?
- 30. Bhala ikhowudi yeJavaScript ukubonisa indlela yokufumana i-HTML yangaphakathi yento.
- 31. Zeziphi ezinye zezikhokelo zeJavaScript?
- 32. KwiJavaScript, yintoni isiganeko esivuzayo?
- 33. Kuthetha ukuthini ukukhumbula iJavaScript?
- 34. Kuthetha ntoni ukungenisa elizweni kunye nokuthunyelwa ngaphandle?
- 35. Ithini i-JavaScript “Strict” mode, yaye ivulwa njani?
- 36. Ufeza ntoni umenzi-mzekelo?
- 37. KwiJavaScript, ithetha ukuthini i-prompt box?
- 38. KwiJavaScript, yenza ntoni ijenereyitha?
- 39. BOM: Yintoni?
- 40. Izikripthi ezimisiweyo: Nguwuphi umsebenzi eziwenza kwiJavaScript?
- isiphelo
Ulwimi lwenkqubo lwasimahla noluvulelekileyo yiJavaScript. Yenzelwe ukuba isetyenziswe ukwenza usetyenziso olusekwe kwiwebhu. Ikhaphukhaphu kwaye iyatolika, nto leyo eyenza ikhawuleze kakhulu kunezinye iilwimi.
Kulula ukusebenzisa iJavaScript kwi izicelo zewebhu ngenxa yokudityaniswa kwayo kwe-HTML. Ukumisela ukuba kubaluleke kangakanani na, khubaza iJavaScript kwisikhangeli sakho kwaye uzame ukulayisha iphepha.
Ezi webhusayithi aziyi kusebenza kakuhle. Iziqulatho zazo zihlala ziziphatha kakubi. Phantse zonke iibrowser zangoku zixuba iHTML, CSS, kunye neJavaScript.
IJavaScript yenye yezitolikiweyo Iilwimi zenkqubo. Itoliki sele ibandakanyiwe kwizikhangeli ezininzi, kuquka iGoogle Chrome, iMicrosoft Internet Explorer, kunye nezinye.
Ngaloo ndlela, ikhowudi yayo inokuqhutyelwa yiNjini yeJavaScript yesikhangeli. Nantsi isiqalo ukuya kwi-JS yodliwano-ndlebe imibuzo kunye neempendulo kwireferensi yakho ukuba ulungiselele udliwano-ndlebe.
Injongo efanayo kukukwazisa kwiintlobo zemibuzo onokudibana nayo ngexesha lodliwano-ndlebe lwakho lobugcisa. Masiqale.
1. Ithetha ntoni iJavaScript kuwe?
Olona lwimi lusetyenziswayo loshicilelo lwewebhu, olusetyenziselwa zombini icala lomxhasi kunye nenkqubo yecala leseva, yiJavaScript. Ikhowudi yeJavascript inokufakwa kumaphepha e-HTML abakhangeli bewebhu abanokuwaqonda kwaye bawaphumeze, exhasa amandla Inkqubo ejolise kwinto.
2. Xela iiparadigm ezimbini ezisisiseko zophuhliso lweJavaScript.
Ukucwangcisa ngeJavaScript, ulwimi lweparadigm ezininzi, kuvumela oku:
- inkqubo/ inkqubo efunekayo
- Inkqubo ejolise kwinjongo (OOP)
- Ukusebenzisa inkqubo esebenzayo
- Indlela yenkqubo esekwe kwiprototype okanye ilifa elisekelwe kwiprototype (ulwandiso lweOOP)
3. Yintoni eyahlula iJavaScript kwiJava?
Ngelixa iJavaScript ilulwimi lokubhala, iJava lulwimi lwenkqubo. IJava lulwimi lwenkqubo olusetyenziswa ngabaphuhlisi ukwenza iinkqubo ezinokusebenza kwinkqubo yokusebenza yekhompyuter, umatshini wenyani, okanye isikhangeli sewebhu. Ngokwahlukileyo, ikhowudi ye-JS yenzelwe ukuba isebenze kuphela ngaphakathi kwesikhangeli.
Kodwa usebenzisa i-Electron kunye neNode.js, ii-apps ezizimeleyo zedesktop zinokudalwa kwiJavaScript. I-Java kunye nekhowudi ye-JS yahluke kakhulu ekubeni le yokugqibela ifumaneka kwifomathi yokubhaliweyo, ngelixa eyokuqala idinga ukuhlanganiswa.
4. Ziziphi iifom zedatha ezixhaswa yiJavaScript?
Iintlobo zedatha ezixhaswa yiJavaScript ziquka:
- Umgca
- umqondiso
- inani
- into
- A nga chaziwe
- null
- Ibhoolean
5. Ziziphi iimpawu enazo iJavaScript?
Lulwimi lwasimahla nolubhalwe jikelele.
Lulwimi lwenkqubo olutolikwayo olukhaphukhaphu.
Yenzelwe ukuba isetyenziselwe ukwakha uthungelwano-centric izicelo.
Zombini ziqhagamshelwe kwaye ziyahambelana neJava.
6. Ziziphi iingxaki zokusebenzisa iJavaScript?
Ababhali beekhowudi abanamava baya kukwazi ukuxoxa ngeentsilelo zolwimi abalukhethayo ukongeza ekubabazeni izimilo zalo. Ukhuseleko sesona siphene sibi kwiJavaScript. Funa ulwazi ngendlela enokuxhatshazwa ngayo.
Enye i-drawback ye-JavaScript kukusetyenziswa kwayo ngokubanzi kunye nokuguquguquka, okunokuba likrele elintlangothi-mbini kuba ishiya indlela eninzi yokwenza izinto ezingaqhelekanga ezinokukhokelela ekusebenzeni okungalinganiyo kwiinkqubo ezahlukeneyo.
7. Ikuvumela njani iJavaScript ukuba wakhe into?
Uluvo lwezinto luxhaswa kakuhle yiJavaScript. Ukusebenzisa into yokoqobo, unokwakha into enje ngasezantsi:
8. KwiJavaScript, ulwakha njani uluhlu?
Uluhlu oluchanekileyo lunokusetyenziswa ukuchaza uluhlu ngolu hlobo lulandelayo:
9. Indlela yokuchaza umsebenzi wegama kwiJavaScript kwaye yintoni na?
Xa umsebenzi onikwe igama uchazwa, ngokukhawuleza uchaza igama. Inokuchazwa ngolu hlobo lulandelayo usebenzisa igama elingundoqo lomsebenzi:
10. KwiJavaScript, chaza ukunyuswa.
Zonke izibhengezo eziguquguqukayo kunye nomsebenzi zitshintshelwa phezulu ngokungagqibekanga kwiJavaScript, eyaziwa ngokuba yi-hoisting. Oku kuthetha ukuba zonke izinto eziguquguqukayo kunye nemisebenzi, nokuba zichazwe phi na, zifuduselwe phezulu kumda. Ufikelelo lunokuba lwendawo okanye lwamazwe ngamazwe.
11. Ingaba ibandakanya ntoni imida yeJavaScript?
Icandelo lenkqubo yakho apho uguqulo luchazwayo ngumda woguqulo. Mibini kuphela imida apho iJavaScript iguquguqukayo ingaba nayo.
- Izinto eziguquguqukayo zehlabathi: Yonke indawo kwikhowudi yakho yeJavaScript inokubona ukuguquguquka kwehlabathi njengoko inobubanzi behlabathi.
- Izinto eziguquguqukayo zasekuhlaleni: Kuphela ngaphakathi komsebenzi apho ibhengezwe khona apho uguqulo lwasekuhlaleni luya kubonakala. Indawo kulo msebenzi, iingxoxo zemisebenzi zihlala zikhona.
12. Yeyiphi ekhawulezayo, iscript seASP okanye iJavaScript?
Ngokukhawuleza yiJavaScript. IJavaScript inokuphunyezwa ngaphandle koncedo lomncedisi wewebhu kuba lulwimi lwecala lomxhasi. Nangona kunjalo, njengoko i-ASP ilulwimi olusecaleni kweseva, iyakuhlala icotha kuneJavaScript. Okwangoku, iJavaScript ikwalulwimi olusecaleni kweseva (nodejs).
13. Chaza ukuba ilifa leprototypal lahluke njani kwilifa lakudala.
IJavaScript inamandla amangalisayo okuphelisa imiqobo engqongqo yelifa lemveli kwaye ivumele izinto ukuba zifumane iimpawu kwezinye izinto. -
- Ilifa leClassical: Ngoncedo lwegama elingundoqo "elitsha", umsebenzi womakhi udala umzekelo. Iimpawu zodidi lwabazali zigqithiselwa kulo mzekelo mtsha.
- Ilifa lePrototypal: Into ekhoyo esebenza njengeprototype ikotshwa ukwenza umzekelo. Ilifa elikhethiweyo elivela kwizinto ezininzi ezahlukeneyo linokuba luncedo kulo mzekelo, ehlala iyilwe ngomsebenzi wefektri okanye "Object.create()".
14. Bhala iprogram eya kongeza amacandelo amatsha ngamandla.
15. Callback: Yintoni?
Umsebenzi olula weJavaScript othunyelwe njengengxabano okanye ukhetho kwindlela eyaziwa ngokuba yi-callback. Igama elithi “call back” libhekisela kumsebenzi ocetywa ukwenziwa emva kokugqitywa komnye umsebenzi. Imisebenzi zizinto ezikwiJavaScript. Izinto zeJavaScript ziyimisebenzi. Imisebenzi ke ngoko inokubuyisela eminye imisebenzi kwaye ifumane eminye imisebenzi njengamagalelo.
16. Ingalungiswa njani inkqubo yeJavaScript?
Ngokubetha isitshixo esifanelekileyo, ngokuqhelekileyo, iqhosha le-F12, zonke iiphequluli zewebhu zangoku, kuquka iChrome, iFirefox, kunye nezinye, ziza ne-debugger edibeneyo enokusetyenziswa nangaliphi na ixesha.
Abasebenzisi bangenza inzuzo kwiinkalo ezahlukeneyo ezibonelelwa ngezixhobo zokucoca. Umhleli wekhowudi esisebenzisayo ukwenza usetyenziso lweJavaScript ikwasivumela ukuba sixazulule ikhowudi yeJavaScript.
17. Ukuvalwa: Yintoni? Yenza umzekeliso.
Xa ukuguquguquka okuchaziweyo ngaphandle komda wangoku kufikeleleka kumda ongaphakathi kuwo, ukuvalwa kuveliswa. Ikuvumela ukuba ufikelele kububanzi bomsebenzi wangaphandle ukusuka kumsebenzi wangaphakathi.
Ngalo lonke ixesha umsebenzi wenziwa kwiJavaScript, ukuvalwa kuyaveliswa. Bhala ngokulula umsebenzi phakathi komnye umsebenzi, uwuveze, emva koko uwusebenzise ukuphumeza ukuvala.
18. Ziziphi iindlela ezikhoyo zokubandakanya ikhowudi yeJavaScript kwifayile ye-HTML?
Ikhowudi yeJavaScript inokufakwa ngokuyintloko ngenye yeendlela ezimbini:
- Xa kuphela imigca embalwa yombhalo efunekayo ngaphakathi kwiphepha lewebhu, sinokubhala ikhowudi yeJavaScript ngaphakathi kwendawo yeskripthi kwifayile ye-HTML efanayo.
- Ukongeza zonke iimpawu zescripting kwiphepha lewebhu ngaphandle kokuvala ikhowudi, sinokungenisa ifayile yemvelaphi yeJavaScript kuxwebhu lweHTML.
19. Zisebenza njani izibali-xesha kwiJavaScript?
Izibali-xesha zisetyenziselwa ukuqhuba okanye ukuphinda ikhowudi yekhowudi ngexesha elimiselweyo. I-setTimeout, setInterval, kunye ne clearInterval iindlela zisetyenziswa ukwenza oku.
Usebenzisa i setTimeout(umsebenzi, ulibaziseko) umsebenzi, isibali-xesha esiqhuba umsebenzi othile emva kokuba ulibaziseko olukhankanyiweyo lucwangcisiwe. Umsebenzi useteIsithuba(umsebenzi, ulibaziseko) uphinda usebenze umsebenzi okhankanyiweyo kulibaziseko olukhankanyiweyo kwaye ume kuphela xa ucinyiwe.
Isibali-xesha sixelelwa ukuba siphelise ngokusebenzisa indlela ecacileyo yeInterval(id). Kuba izibali-xesha ziqhutywa kumsonto omnye, imisitho inokufola kwaye ilinde ukwenziwa.
20. Zithini iimbono zakho malunga namaqebengwana?
I-cookie idla ngokuba yidatha encinci ethunyelwa yiwebhusayithi kwikhompyuter yomsebenzisi kwaye igcinwe apho sisikhangeli sewebhu esisetyenzisiweyo ukutyelela iphepha.
Iikuki zisetyenziselwa ukubamba imisebenzi yokujonga iwebhusayithi kunye nokukhumbula ulwazi ukuze lusetyenziswe kamva.
21. Umntu angawenza njani amaqebengwana?
Oku kulandelayo yeyona ndlela ilula yeJavaScript yokwenza iikuki:
22. Zithini iJavaScript eziguquguqukayo zamagama iindibano?
Xa ubiza iinguqu kwiJavaScript, kufuneka ubambelele kule migaqo ilandelayo:
Nayiphi na iJavaScript egciniweyo amagama angundoqo akufuneki isetyenziswe njengamagama aguquguqukayo. Umzekelo, amagama aguquguqukayo aphela ngekhefu okanye i-boolean awasebenzi.
Igama loguqulo kwiJavaScript akufuneki liqale ngenani (0-9). Kufuneka baqale ngonobumba okanye ngesimboli sangaphantsi.
Umzekelo, 123name ayilogama elamkelekileyo eliguquguqukayo, nangona _123igama okanye igama123 linjalo. Imicimbi kumagama aguquguqukayo eJavaScript. Uvavanyo kunye novavanyo, umzekelo, zizinto ezimbini ezahlukeneyo.
23. Yintoni eyenza ukwahlukana nokwahlukana komnye nomnye?
KwiJavaScript, izibhengezo zezinto eziguquguqukayo kunye neendlela zinokwenziwa kusetyenziswa nokuba yi-let okanye var. Owona mahluko wokwenyani kuphela phakathi kwezi zimbini kukuba igama elingundoqo le-let lihlolwe yibhloko, ngelixa igama elingundoqo le-var lihlolwa ngumsebenzi.
24. Kutheni kukho imisebenzi yokuzenzela?
IiNgcaciso zoMsebenzi eziceliweyo ngoko nangoko okanye ukuZiphumeza ngokungaziwayo imiSebenzi ngamanye amagama abo. Ezi zaziwa njenge "Self Invoking Functions" kuba zibizwa ngekhowudi ngokuzenzekelayo.
Sibhala umsebenzi kwaye siwubize. Nangona kunjalo, imisebenzi engaziwa ingasetyenziswa ukuba sifuna umsebenzi usebenze ngokuzenzekelayo xa ucacisiwe kwaye ukuba asisayi kuphinda siwusebenzise. Ukongeza, eminye imisebenzi ayinagama.
25. Yintoni eyahlula ipropati kwiimpawu?
Iimpawu zeempawu zezinto ze-JS DOM zisebenza ngokufanayo kumzekelo oguquguqukayo wamacandelo athile. Ipropathi inokubandakanya iindidi ezahlukeneyo zedatha.
Ungafikelela kwiipropati ngokusebenzisana nento kwiVanilla JS okanye ngokusebenzisa iprop () umsebenzi wejQuery.
Iimpawu zeempawu zifumaneka kwi-HTML, hayi iDOM. Ziyathelekiseka neepropathi kodwa zinesakhono esincinci. Ukuba iipropathi ziyafumaneka, ukusebenza nazo kuyacetyiswa ngaphezulu kokusebenza neempawu.
Uphawu loyelelwano luhlobo lwedatha yomtya, ngokuchaseneyo nepropati.
26. KwiJavaScript, yintoni imisebenzi yotolo?
KwiJavaScript, imisebenzi yotolo yindlela ekhawulezayo necacileyo yokubhala imisebenzi. Umsebenzi wetolo unesintaksi ngokubanzi elandelayo:
27. Luluphi ulwimi oluchwetheziweyo?
Amanani kuneziguquguquko anxulumana enye kwenye kwiilwimi ezichwetheziweyo. Kukho iindidi ezimbini:
Ngokunamandla: Ngokungafaniyo ne-JS, apho uguqulo lunokwamkela inani okanye umtya, oku kuvumela ukuguquguquka ukuqulatha iindidi ezininzi.
Ngokwesigxina: Kule, inguqu ingagcina uhlobo olunye kuphela; umzekelo, kwiJava, umtya oguquguqukayo unokugcina kuphela iqela elithile labasebenzi.
28. KwiJavaScript, nceda uchaze NEGATIVE INFINITY.
Xa inani elithabathayo elithabathayo lahlulwe ngo-0, indawo engatshintshiyo NEGATIVE INFINITY iziphumo ziyilwe kwi-JS. Ezi zezinye zeempawu zayo ezibalulekileyo:
Akukho zinto zongezelelweyo kufuneka zenziwe ukuze ufikelele kwi-NEGATIVE INFINITY.
I-NEGATIVE INFINITY ixabiso lepropathi lihambelana nexabiso lepropathi engapheliyo yexabiso lehlabathi jikelele.
29. Yintoni eyahlula i-undefined from null?
Ukungachazwanga kuchaza umahluko oxeliweyo ongekanikwa xabiso. I-Null lixabiso lesabelo, kwelinye icala. Ingasetyenziselwa ukubonisa akukho xabiso kwaye yabelwe uguquko.
Ukungachazwanga luhlobo kuyo ngokwayo (engachazwanga), ngelixa i-null iyinto. Ukungachazwanga kunye ne-null nazo zintlobo ezimbini ezahlukeneyo.
30. Bhala ikhowudi yeJavaScript ukubonisa indlela yokufumana i-HTML yangaphakathi yento.
31. Zeziphi ezinye zezikhokelo zeJavaScript?
Isakhelo sesicelo esenziwe kwiJavaScript saziwa njengesakhelo seJavaScript. Ngemimiselo yokuba ukuhamba kolawulo, iyahluka kwilayibrari yeJavaScript. Kukho iinkqubo ezininzi zeJavaScript ezikhoyo, nangona kunjalo, ezimbalwa ezidumileyo ziquka:
- emboxo
- usabela
- Vue
32. KwiJavaScript, yintoni isiganeko esivuzayo?
Xa isiganeko sisenzeka kwinto enye ngaphakathi kwenye into kwaye zombini iziqalelo zibhalise isibambo kweso siganeko, i-HTML DOM API isebenzisa i-bubbling yesiganeko njengendlela yokusasaza isiganeko.
Xa kukho ukugquma, isiganeko sibonwa kwaye siqhutywe yinto engaphakathi ngaphambi kokuba idluliselwe kumalungu ajikelezileyo.
Ukuqala kweso siganeko, ukubulawa kufudukela kwinto yomzali. Ukulandela oko, into yomzali wayo ifumana ukubulawa, njalo njalo de kube yinto yomzimba.
33. Kuthetha ukuthini ukukhumbula iJavaScript?
Ukunkqaya yindlela yokuphucula ekhawulezisa ikhowudi yakho ngokugcina iziphumo zeefowuni zexabiso lemisebenzi kunye nokuphinda uzisebenzise xa igalelo elifanayo lifunyanwa kwakhona.
Umsebenzi ubizwa ngokuba yindleko ukuba ufuna ixesha elininzi kunye nememori ukuze uphumeze kuba wenza izibalo ezinzima. I-cache ihlaliswa ngokukhawuleza ngesiphumo sefowuni ebiza kakhulu.
Umsebenzi ofanayo uyakudlula ubalo oluyimfuneko kwaye ubuyisele ixabiso eligciniweyo ukuba libizwa kwakhona ngegalelo elifanayo leeparamitha.
Kuba umsebenzi awudingi kuphinda wenze izibalo okanye ubalo osele ulwenzile, le ndlela igcina ixesha kunye nenkumbulo esetyenziswa yinkqubo yakho.
34. Kuthetha ntoni ukungenisa elizweni kunye nokuthunyelwa ngaphandle?
Sinokwenza ikhowudi yemodyuli yeJavaScript ngoncedo lokungeniswa ngaphandle kunye nokuthunyelwa ngaphandle. Sinokuhlula ikhowudi yethu kwiifayile ezininzi ngokusebenzisa ukungenisa kunye nokuthumela ngaphandle. Imizekelo ibandakanya
35. Ithini i-JavaScript “Strict” mode, yaye ivulwa njani?
Unokuphucula ukujonga iimpazamo kwikhowudi yakho ngokusebenzisa indlela engqongqo.
Xa usebenzisa imo engqongqo, awukwazi ukongeza iipropathi kwizinto ezingenakwandiswa, unike amaxabiso kwiipropati zokufunda kuphela, ukusebenzisa iinguqu ezichazwe ngokucacileyo, okanye unikeze amaxabiso kwiinguqu zokufunda kuphela.
Ngokuqala ifayile, inkqubo, okanye umsebenzi “ngokusebenzisa ngokungqongqo,” ungavula indlela engqongqo.
36. Ufeza ntoni umenzi-mzekelo?
Umqhubi wemeko yomzekelo umisela ukuba ikhonkco leprototype yento inazo naziphi na iimeko zepropathi yomfuziselo yomakhi. Ngamanye amazwi, umzekelo womqhubi umisela ngexesha lokuqhuba ukuba into ngumzekelo weklasi.
Umsebenzisi we-exampleof usetyenziswa kumzekelo ongezantsi ukumisela uhlobo lwabasebenzisi abaguquguqukayo.
37. KwiJavaScript, ithetha ukuthini i-prompt box?
Ibhokisi ekhawulezayo yibhokisi enebhokisi yokubhaliweyo evumela umsebenzisi ukuba anike igalelo. Ibhokisi yencoko yababini ecela igalelo iboniswa nge-prompt () umsebenzi. Sebenzisa ibhokisi ekhawulezayo ukuba ufuna umsebenzisi angenise ixabiso ngaphambi kokubona iphepha.
Umsebenzisi kufuneka akhethe "Kulungile" okanye "Rhoxisa" kwibhokisi ephumayo evela emva kokufaka ixabiso ukuze uqhubeke.
38. KwiJavaScript, yenza ntoni ijenereyitha?
Iijenereyitha ziyimisebenzi enokusetyenziswa ngamaxesha ahlukeneyo. Umxholo kunye nezibophelelo eziguquguqukayo zale misebenzi zigcinwa kwaye zigcinwe kulo lonke ukungena kwakhona.
Umsebenzi wokwenza umnxeba wokuqala ubuyisela uhlobo oluthile lwesixhobo esibizwa ngokuba yijenereyitha. Inyathelo elilandelayo kukufowunela indlela elandelayo ye-generator ukusebenzisa ixabiso. Ide ifike kwigama elingundoqo lesivuno, umsebenzi wejeneretha uqhubeka usebenza.
39. BOM: Yintoni?
I-BOM, okanye imodeli yento yesikhangeli, ivumela abasebenzisi ukuba basebenzisane nabaphequluli, apho ifestile isebenza njengento yokuqala. Ukongeza kwezinye iimpawu, into yefestile inoxwebhu, imbali, isikrini, i-navigator, kunye nendawo.
Umsebenzi wefestile, nangona kunjalo, unokufikelelwa ngokuthe ngqo kwaye ngokubhekisa kwifestile.
40. Izikripthi ezimisiweyo: Nguwuphi umsebenzi eziwenza kwiJavaScript?
Isikhangeli siqala ukwahlula ikhowudi yeHTML xa iphepha lilayisha. Ngokungagqibekanga, isikhangeli sinqumamisa ukwahlulahlula ikhowudi ye-HTML xa sidibana neskripthi kwaye siqala ukusebenzisa iskripthi endaweni yoko.
Ukulandela ukugqitywa kweskripthi, isikhangeli siphinda siqalise ukusetyenzwa kwekhowudi yeHTML.
Umthwalo wephepha uya kulibaziseka ngumncedisi olivila okanye iskripthi esikhulu. Izikripthi ezirhoxisiweyo ziyekile ukuqhuba iscript de kube semva kokuba uxwebhu lugqityiwe.
Oku kulibaziseka kumiliselo lweskripthi kunciphisa ixesha elithathwayo ukuze iphepha lewebhu lilayishwe.
isiphelo
Siyathemba ukuba le mibuzo yeJavaScript yodliwano-ndlebe iya kuba luncedo kuwe, nokuba ungumphuhlisi ulungiselela intlanganiso okanye ungumphathi oqeshayo ozama ukufumana umfaki-sicelo ofanelekileyo.
Khumbula ukuba ubuchwephesha kunye nolwazi zenza inxalenye encinci yenkqubo yokugaya. Ukuqinisekisa ukuba uyawufumana umhlaba (okanye ufunela umfaki-sicelo ofanelekileyo) umsebenzi, amava exesha elidlulileyo, kunye nezakhono ezithambileyo zibalulekile ngokulinganayo.
Yazi ukuba kuhlala kukho iimpendulo ezininzi ezichanekileyo kwimibuzo yodliwano-ndlebe evulekileyo yeJavaScript. Udliwano-ndlebe lunomdla kwingqiqo emva kweempendulo zakho, kungekhona nje impendulo oyinkqayile.
Yilungele imibuzo yokulandela malunga nendlela ofike ngayo kwimpendulo yakho kwaye uhlale ukwazi ukucacisa inkqubo yakho yokucinga.
Phuma Uthotho lodliwano-ndlebe lweHashdork ngoncedo lokulungiselela udliwano-ndlebe.
Arun
Wow, Eli nqaku landinceda kakhulu ngexesha lokulungiselela udliwanondlebe lwam lweJavascript