Abakhethi kwi-CSS banokusinceda ngokulula ukongeza izitayile ezifunekayo kwizinto ezichaziweyo.Leli nqaku liza kuphendula ngokweenkcukacha ezikhethiweyo ezintathu: "nth-child", ": first-child" and ": first-of-type" Umahluko .

IJavaScript lulwimi oluya kuthi ngokuqinisekileyo lusetyenziswe kuphuhliso lwewebhu Eli nqaku lichaza ngokweenkcukacha ukuba ungawufumana njani owona mgca wekhowudi yangoku ngexesha lokubaleka.

IJavaScript lulwimi oluya kuthi ngokuqinisekileyo lusetyenziswe kuphuhliso lwewebhu, phakathi kwazo okungafunekiyo kunye nokungachazwanga kuhlala kudibana nathi.Le nqaku ichaza iimpawu zezi zimbini ngokweenkcukacha.

Xa i-setInterval isebenza ngasemva kwisikhangeli, elona xesha lincinci lokuqalisa liya kutshintshwa ngenkani liye kwii-millisecond ezili-1000, kwaye liza kuyeka emva kokusebenza kangangexesha elithile. Eli nqaku lichaza indlela yokusombulula le ngxaki.

Indawo engonelanga yediski kwiLinux ihlala ibangelwa ziifayile zelog ezigqithileyo. Kodwa sihlala singazi ukuba zigcinwa phi iifayile zelog. Okwangoku, kufuneka sijonge ubungakanani bomaleko wolawulo ngomaleko ukufumana indawo ekuyo ifayile. Eli nqaku lazisa ngomyalelo kwiLinux ukujonga ubungakanani befayile yolawulo.

Xa ubhala kwaye ufaka iRedis5 kwi-CentOS7, bekukho impazamo yokuba i-jemalloc.h ayifumanekanga. Eli nqaku lichaza indlela yokusombulula.

Xa kwakubhalwa kwaye kufakwa iPython3, bekukho impazamo kwisihloko. Eli nqaku lichaza indlela yokusombulula.

Iidayode zisetyenziswa kakhulu kwizinto ze-elektroniki. Eli nqaku ikakhulu lazisa ukubuyela umva kunye neempawu zediode.

Xa sibhala ikhowudi, kuhlala kukho iimpazamo kwiindawo ezithile, kwaye ezi mpazamo azinakuphepheka kwaye zinokungahoywa ngeli xesha, sinokusebenzisa impazamo ye-PHP yokucinezela iimpazamo.

Sebenzisa i-YUM ukufaka isoftware kulula ngakumbi kunokwenza kunye nokufaka. Kodwa ukuba iseva yethu ayinayo i-IP yoluntu kuthungelwano lwangaphakathi, kufuneka sinxibelelane nenethiwekhi yoluntu ngokusebenzisa iseva yommeleli. Eli nqaku lichaza indlela yokumisela i-SOCKS5 proxy ye-YUM.

I-Apache yeyona software isetyenziswayo kwihlabathi lonke. Inokusebenza phantse kuwo onke amaqonga eekhompyuter asetyenziswa kakhulu.Kuba ngenxa yeqonga layo lomnqamlezo kunye nokhuseleko lusetyenziswa ngokubanzi, yenye yezona software zecala leWebhu zidumileyo. Eli nqaku lichaza ngokweenkcukacha indlela yokufaka i-Apache kwi-CentOS7.

I-NET liqonga lophuhliso lweMicrosoft, kuba inokusebenza kuphela kwiWindows kwiintsuku zokuqala, inezithintelo ezininzi. Kodwa entsha yeNET sele ixhasa ukusebenza kweLinux. Eli nqaku lichaza ngokweenkcukacha indlela yokufaka i-NET Core kwi-CentOS7.

I-MySQL yindawo evulekileyo yolwazi oluhambelana noluntu. I-MySQL8 ingqongqo ngakumbi kwaye iphuculwe ukhuseleko kunenguqulo yangaphambili. Kwangelo xesha, i-MySQL8 ikwenzile okuninzi kokusebenza. Eli nqaku lichaza ngokweenkcukacha indlela yokufaka kunye nokuseta i-MySQL8 kwi-CentOS7.

I-SVN sisishunqulelo sotshintsho, inkqubo yolawulo lwenguqulo evulelekileyo. Ihlala isetyenziselwa abantu abaninzi ukuphuhlisa ngokudibeneyo iprojekthi enye, ukufezekisa izixhobo ezabiweyo, kunye nolawulo olusembindini. Eli nqaku lichaza ngokweenkcukacha indlela yokufaka inkonzo ye-SVN kwi-CentOS7.

UMariaDB lisebe le-MySQL.Ukusetyenziswa kwayo kuyafana ne-MySQL, kodwa ixhasa amaqela amaninzi okusingathwa, eyahlukileyo kwimowudi yekhoboka le-MySQL. Eli nqaku lichaza ngokweenkcukacha indlela yokufaka iMariaDB 10.4 kwi-CentOS7.

Ukuba sifuna ukongeza nokukhupha imihla kunye namaxesha kwi-MySQL, singasebenzisa: DATE_ADD, DATE_SUB, ADDDATE, SUBDATE.Leli nqaku lichaza ukusetyenziswa kwale misebenzi ngokweenkcukacha.

Ngokwesiqhelo kufuneka sifake iimpazamo zehlabathi kwi-PHP kwaye emva koko sibhale irekhodi, ukuze sikwazi ukufumana iingxaki kwinkqubo ngexesha. Kodwa emva kokuba sisete impazamo yokubuyela emva komsebenzi nge-set_error_handler, asikwazi ukubamba iimpazamo zenqanaba leFATAL. Eli nqaku lichaza indlela yokufaka iimpazamo zenqanaba leFATAL ezenziwe ngexesha lokubaleka le-PHP.

I-EMQX iseva ye-MQTT egqibeleleyo.Le nqaku ichaza indlela yokwenza ikhowudi yokugunyazisa ukubiza i-API interface ye-EMQX.

I-EMQX iseva ebalaseleyo ye-MQTT Eli nqaku lichaza ukuba ungayisebenzisa njani ikhowudi yakho ukulawula ugunyaziso xa abathengi abakhaliphileyo beqhagamshela kwiinkonzo kwaye bebhalisela ukupapasha izihloko.

I-EMQX ngumncedisi womyalezo we-MQTT ogqwesileyo.Iqela lazo lixhasa amashumi ezigidi zonxibelelwano kwaye linendlela elula yolwandiso. Eli nqaku lichaza ngokweenkcukacha indlela yokufaka i-EMQX kwi-CentOS7.