Ma jirto jawaab hal-cabbir ah oo ku habboon su'aashan, sababtoo ah dhibaatada ugu weyn ee laga yaabo inay la xiriirto isticmaalka JavaScript ee browserka mobaylka way kala duwanaan doontaa iyadoo ku xiran qalabka aad isticmaalayso. Si kastaba ha ahaatee, qaar ka mid ah dhibaatooyinka caadiga ah ee laga yaabo inay dhacaan marka JavaScript lagu isticmaalo qalabka mobaylka waxaa ka mid ah waxqabadka gaabiska ah iyo dhibka helitaanka qaababka qaar ka mid ah browserka webka.
if (navigator.userAgent.match(/Android/i)
|| navigator.userAgent.match(/webOS/i)
|| navigator.userAgent.match(/iPhone/i)
|| navigator.userAgent.match(/iPad/i)
|| navigator.userAgent.match(/iPod/i)
|| navigator.userAgent.match(/BlackBerry/)
|| navigator.userAgent.match(/Windows Phone/)
){
// some code..
}
Koodhka ayaa hubinaya haddii isticmaaluhu uu ku jiro aalad Android, aaladda webOS, iPhone, iPad, iPod, BlackBerry, ama Windows Phone. Haddii isticmaaluhu uu ku jiro mid ka mid ah aaladahaas, koodka ayaa shaqayn doona.
Ogaanshaha browserka
Ogaanshaha browserka ee JavaScript waa mawduuc dhib badan. Daalacashada kala duwan ayaa leh awoodo kala duwan, markaa way adagtahay in la sameeyo algorithm ogaanshaha caalamiga ah.
Mid ka mid ah habka waa in la isticmaalo farsamooyinka ogaanshaha muuqaalada. Tusaale ahaan, waxaad hubin kartaa joogitaanka qaabka shayga dokumentiga (DOM) ama shayga daaqada. Si kastaba ha ahaatee, habkani had iyo jeer ma aha mid la isku halayn karo sababtoo ah daalacashada kala duwan ayaa siyaalo kala duwan u hirgeliya sifooyinkaas.
Habka kale waa isticmaalka heuristics. Tusaale ahaan, waxaad raadin kartaa tags HTML gaar ah ama hanti. Si kastaba ha ahaatee, habkani sidoo kale wuxuu noqon karaa mid aan la isku halleyn karin sababtoo ah daalacashada kala duwan ayaa siyaabo kala duwan u fasiraadda calaamadahan iyo guryaha.
Ugu dambayntii, ogaanshaha browserka ee JavaScript waa hawl adag oo u baahan qorshayn iyo tijaabin taxadar leh.
Haddii Loop
An if loop waa nooc ka mid ah loop kaas oo kuu ogolaanaya inaad tijaabiso xaalad oo aad sameyso xannibaad kood ah oo ku saleysan natiijada.
Haddii xaaladdu run tahay, koodka ku jira block waa la fuliyay. Haddii xaaladdu ay been tahay, koodka ku dhex jira baloogga waa la booday oo fulinta ayaa ku sii socota bayaanka xiga ee bayaanka.
Tusaalaha soo socdaa wuxuu tusinayaa sida loop-ka loo isticmaali karo daabacaadda farriimaha kala duwan iyadoo ku xiran haddii nambarku uu xitaa yahay ama uu qariib yahay:
var nambar = 5; // samee tusaale doorsoomayaal isugeyn ah si aad u kaydiso qiimaha nambarka haddii (nambar % 2 == 0) {console.log("Lambarka" + nambarka +" waa xitaa."); } kale {console.log } // Ku socodsii koodka gudaha xargaha qaloocan si aad u daabacdo farriimaha kala duwan iyadoo ku xiran haddii nambarkeenu uu xitaa yahay ama uu qariib yahay. tirada = 4; // u beddel qiimahayada doorsoomiyaha nambarka si aanay u noqon tiro siman haddii (num % 2 == 1) {console.log("Lambarka" + nambarka +" waa xataa." } kale {console.log }
