I-JavaScript: inkinobho icala - ongakhetha Ukukhetha

Isizathu ihlale ifana, amagugu cishe eziningi. Noma okuphambene nalokho: nenani elilodwa kuyoba izizathu eziningana lapho ivela khona. Kunoma ikuphi, kuye ngokuthi izimo ezithile udinga ukuthatha ikhambi elilodwa kuphela, noma okuphambene nalokho.

Ngisho noma isinqumo Ungaba nazo izinketho ezimbalwa nganoma iyiphi injongo kuzoholela Yinye kuphela indlela, kodwa izindlela ngokuvamile eziningana, futhi sidinga ukuba wenze isinqumo.

Classic isitatimende okunemibandela uma (isimo) {1 algorithm, uma isimo kuyiqiniso} enye {2 algorithm, uma isimo kungamanga} ukunika ngezinto ezimbili kuphela okungakhethwa. Kodwa ngisho inselele elula real njalo unikeza omningi ongakhetha.

A elula "akekho", kodwa ngaphansi kombandela owodwa

I-JavaScript Design, ukushintshela icala = amagugu amaningi izimo. Ingatholakala kusetshenziswa ezifanayo Uma inhlanganisela opharetha. Nokho, akungabazeki ukuthi, samuntu lokuqala olungile kanye wokufihla ngaphezulu efanele. Ngaphezu kwalokho, isinqumo esisemthethweni ku version yesibili kuzodinga kakhudlwana ikhono Unjiniyela:

Kukhona inhlanganisela uma (...) {...} enye {...} uphinde uzame {...} basaqhubeka (...) {...} inikeza phezulu inqubo AJAX-exchange e-algorithm. Ukusabela ukucutshungulwa wenziwa isethi efanayo ezitatimende okunemibandela.

I-JavaScript inkinobho icala: isibonelo

The main umehluko zangaphandle ukhethe ngaphansi kombandela owodwa: awukwazi ukubhala ezimbili, kanye amabhlogo ambalwa imiyalo elisebenzisekayo. Kuyoba abulawe kanye kuphela noma amazwi ambalwa nje okuphawula.

Ukwakheka J avaScript inkinobho icala ivumela ukunikeza sebuningini algorithm kuye ngenani kwenombolo noma inkulumo. Kubalulekile ukukhumbula ukuthi uzokhetha ye-algorithm zizokwenziwa ku umdlalo ngqo ngokuya ukubaluleka switch () futhi ukubaluleka kwalokho okushiwo kuleli cala. I "1" futhi nenombolo 1 - lolu hlobo ukuguqulwa akwenziwa lapha akufani.

Buciko izigaba eziningi

Isici nobuntu umklamo izinqumo J avaScript inkinobho icala ukungabi khona kubakaki amabhlogo - {...} ukuphathiswa ukuchaza kuphela isiqalo nesiphetho umzimba opharetha. Ingxenye ngayinye evala icala ikhefu opharetha, ekungafanele kube.

Kulezi zibonelo kweqiwe umkhondo engxenyeni yokuqala. Inketho ngakwesokunxele uyonika yi Variant2, ngoba kulapha lapho iqala ukukhishwa, futhi samuntu ilungelo izotholwa Variant1Variant2, njengoba kuzokwenziwa ngowokuqala, kodwa akukho nomphumela isimo yesibili, futhi ngaphandle kwalokho, lutho kuvimbela ezokhipha izitatimende esigabeni sokuqala-ke kwesibili, phakathi kwabo akukho ikhefu opharetha, kodwa kabili i-JavaScript inkinobho icala asipheli. Kufanele kuqashelwe ukuthi ushintsho iCond okuguquguqukayo isakhiwo umzimba akukwenzi yimuphi umphumela.

Khomba engokoqobo futhi ngokoqobo inkinga

I-JavaScript - ulimi omkhulu, esheshayo, emfushane okunengqondo ne-syntax esetshenziswa. I-JavaScript inkinobho icala design isebenza ngokuphelele, okuvumela incazelo ecacile nenembile ezihlukahlukene oyifunayo ongakhetha ngemibandela ethize.

Inketho yo-opheretha ingase ifakwe phakathi nomunye. Endabeni izigaba kungenzeka izitatimende okunemibandela izihibe, yimuphi omunye izakhiwo. Akufanele singayinaki ububanzi lokwehlukile. Njengoba lisetshenziswe ngalo kuyo yonke indawo echazwe emhlabeni wonke.

Nokho, akufanele uphathwe kabi i-JavaScript. Shintsha icala - ithuluzi legatsha enhle, kodwa hhayi kule ephezulu ivolumu ikhodi ephathekayo. Ububanzi Cabangisisa futhi functional ongakhetha singaqaphile, lo nzima ke liyoshintshwa kamuva.

Inselele enkulu akasoze yima, uma ungathathi bangeniswa izinguquko akhawunti ngokuhamba isinqumo sayo, ukuthi njengoba kwaqedwa umsebenzi, ezinsukwini zokuqala wokusebenza ukwakha isisetshenziswa kuyoba ezinganembile nobumbi baphawula. Inselele Yiqiniso, ngeke uye phambili, futhi nesayithi libe kuyodingeka ziqedwe.

Kule ngombono, ububi eyinhloko-JavaScript inkinobho icala sivela lingakanani kanye yinkimbinkimbi. Uma ungenalo kabi, ongayifinyelela ukwenza izinqumo icwecwe futhi ezincane.

Isimo + isixazululo = entsha round ukunyakaza

inkinga ngendlela efanele washayelwa okulingana isixazululo. Nakuba inkinga, nge ncazelo, ngokwako akukwazi kuxazulule lutho, nokusondeza.

Isimo isetshenziswa yonke indawo (yangasese umsebenzi omncane). izimo ngokubulawa = ukubulawa abanye ikhodi. Sebenzisa i-JavaScript inkinobho icala - kuba isitatimende imfashini, kanye nesidingo esicacile. Njengoba enziwa kuzo zonke izilimi, ngoba ilula futhi elula.

Uma ozalwa "ukufefeza" futhi "wesisusa", efana izilimi zabo izinhlelo. Kwakukhona izimpi phezu opharetha ushintsho kanye amalebula. Ngizama ukuthola ehloniphekile simo isitayela obusebenzayo lokubhala izinhlelo. Namuhla, umthuthukisi omkhulu ngentshiseko Zikhuthaza imibono into-ngamakhasimende.

Nokho, kuze kube manje emisebenzini yesimanje ukuthola izitatimende zabo ezibalulekile okunemibandela. Kodwa okushiwo imibono yesimanje e yokuthi izinto ngokwabo setha izimo futhi athole amakhambi. Phela, into - iqoqo le-syntax kanye engasho lutho.