Abakhethi ku-CSS bangasisiza kalula ukuthi sengeze izitayela ezidingekayo ezintweni ezichaziwe. Lo mbhalo uzophendula ngokuningiliziwe ngabakhethi abathathu ": nth-child", ": first-child" kanye no ": first-of-type" Umehluko .

IJavaScript wulimi oluzosetshenziswa nakanjani ekuthuthukiseni iwebhu.Le ndatshana ichaza ngokuningiliziwe ukuthi ungayithola kanjani inombolo yangempela yomugqa yekhodi yamanje ngesikhathi sokusebenza.

IJavaScript wulimi oluzosetshenziswa nakanjani ekuthuthukiseni iwebhu, phakathi kwalo okungaxakile nokungachazeki esivame ukuhlangana nakho thina.Le ndatshana ichaza izici zalokhu ngokuningiliziwe.

Lapho i-setInterval isebenza ngemuva kwesiphequluli, isikhawu esincane sokuqalisa sizoshintshwa ngenkani sibe ama-millisecond ayi-1000, futhi sizoma ngemuva kokusebenza isikhathi esithile. Lo mbhalo uchaza ukuthi le nkinga ingaxazululwa kanjani.

Isikhala sedisk esinganele kuLinux imvamisa sibangelwa amafayili we-log ngokweqile. Kepha imvamisa asazi ukuthi amafayela we-log agcinwa kuphi. Kuleli qophelo, sidinga ukubheka ubukhulu besendlalelo senkomba ngongqimba ukuthola indawo yefayela. Lo mbhalo wethula umyalo ku-Linux ukubuka usayizi wefayela lesikhombi.

Lapho kuhlanganiswa futhi kufakwa iRedis5 kuCentOS7, kube nephutha lokuthi i-jemalloc.h ibingatholakali. Lo mbhalo uchaza ukuthi ungaxazululwa kanjani.

Lapho kuhlanganiswa futhi kufakwa iPython3, kube nephutha kusihloko. Lo mbhalo uchaza ukuthi ungaxazululwa kanjani.

Lapho sibhala ikhodi, kuhlale kunamaphutha avamile kwezinye izindawo, futhi la maphutha awavikeki futhi anganakwa.Ngalesi sikhathi, singasebenzisa ukucindezela iphutha le-PHP ukuvimba amaphutha.

Sebenzisa i-YUM ukufaka isoftware kulula kakhulu kunokuhlanganisa nokufaka. Kepha uma iseva yethu ingenayo i-IP yomphakathi kunethiwekhi yangaphakathi, sidinga ukuxhuma kunethiwekhi yomphakathi ngeseva elibamba. Le ndatshana ichaza ukuthi ungayilungiselela kanjani i-SOCKS5 proxy ye-YUM.

I-Apache yisoftware yewebhu esetshenziswa kakhulu emhlabeni. Ingasebenza cishe kuwo wonke amapulatifomu ekhompyutha asetshenziswa kakhulu.Ngenxa yesiphambano sayo kanye nokuvikeleka kusetshenziswa kabanzi, ingesinye se-software esithandwa kakhulu iseva yeWebhu. Lo mbhalo uchaza ngokuningiliziwe ukuthi ungayifaka kanjani i-Apache ku-CentOS7.

I-NET iyipulatifomu yokuthuthukisa iMicrosoft, ngoba ingasebenza kuphela kuWindows ezinsukwini zokuqala, inemikhawulo eminingi. Kepha iNET Core entsha isivele isekela ukusebenza kuLinux. Lo mbhalo uchaza ngokuningiliziwe ukuthi ungayifaka kanjani i-NET Core ku-CentOS7.

I-MySQL iyi-database yomthombo ovulekile esetshenziswa kakhulu. I-MySQL8 ilukhuni futhi ivikelekile kakhulu kunenguqulo yangaphambilini. Ngasikhathi sinye, i-MySQL8 nayo yenze ukwenziwa okuhle okuningi ekusebenzeni. Lo mbhalo uchaza ngokuningiliziwe ukuthi ungayifaka kanjani futhi uyilungiselele kanjani i-MySQL8 ku-CentOS7.

I-SVN isifinyezo sokwehliswa, uhlelo lokulawula uhlobo lomthombo ovulekile. Imvamisa isetshenziswa ngabantu abaningi ukwenza ngokuhlanganyela iphrojekthi efanayo, ukufeza izinsizakusebenza ezabiwe, futhi ekugcineni kube nokuphathwa okuphakathi. Lo mbhalo uchaza ngokuningiliziwe ukuthi ungayifaka kanjani insiza ye-SVN ku-CentOS7.

IMariaDB igatsha le-MySQL.Ukusetshenziswa kwayo ngokuyisisekelo kufana ne-MySQL, kepha kuyasekelwa amaqoqo ama-multi-host, ahlukile kunqubo ye-master-slave ye-MySQL. Lo mbhalo uchaza ngokuningiliziwe ukuthi ungayifaka kanjani iMariaDB 10.4 kuCentOS7.

Uma sidinga ukungeza nokususa izinsuku nezikhathi ku-MySQL, singasebenzisa: DATE_ADD, DATE_SUB, ADDDATE, SUBDATE, lo mbhalo uchaza ukusetshenziswa kwale misebenzi ngokuningiliziwe.

Imvamisa sidinga ukuthwebula amaphutha womhlaba wonke ku-PHP bese siqopha izingodo, ukuze sikwazi ukuthola izinkinga ezingaba khona ohlelweni ngesikhathi. Kepha ngemuva kokusetha umsebenzi wokubuyela emuva ngephutha nge-set_error_handler, asikwazi ukubamba amaphutha ezinga le-FATAL. Lo mbhalo uchaza ukuthi ungawabamba kanjani amaphutha ezinga le-FATAL akhiqizwe ngesikhathi sokusebenza kwe-PHP.

I-EMQX iseva ye-MQTT ephelele kakhulu.Le ndatshana ichaza ukuthi ungayakha kanjani ikhodi yokugunyazwa ukubiza i-API interface ye-EMQX.

I-EMQX iseva enhle kakhulu ye-MQTT.Le ndatshana ichaza ukuthi ungayisebenzisa kanjani ikhodi yakho ukulawula ukugunyazwa lapho amaklayenti ahlakaniphile exhuma kumasevisi futhi abhalisela ukushicilela izihloko.

I-EMQX iseva yemilayezo ye-MQTT enhle kakhulu.Iqoqo layo lisekela amashumi ezigidi zokuxhuma futhi linendlela yokwelula eguqukayo. Lo mbhalo uchaza ngokuningiliziwe ukuthi ungayifaka kanjani i-EMQX ku-CentOS7.

I-Redis ingumthombo omuhle kakhulu ovulekile osatshalaliswa kohlelo lokugcina isikhashana. Lo mbhalo uchaza ngokuningiliziwe ukuthi ungayifaka kanjani iRedis kuCentOS7.