Masu zaɓa a cikin CSS na iya taimaka mana sauƙaƙe ƙara hanyoyin da ake buƙata akan abubuwan da aka ƙayyade. Wannan labarin zai amsa dalla-dalla masu zaɓaɓɓun uku ": nth-child", ": na farko-yaro" da ": na farko-na-nau'in" Bambancin .

JavaScript yare ne da tabbas za'ayi amfani dashi wajen cigaban yanar gizo Wannan labarin yayi bayanin dalla-dalla yadda ake samun lambar layin gaskiya ta lambar yanzu a lokacin aiki.

JavaScript yare ne da za ayi amfani da shi cikin ci gaban yanar gizo, wanda a tsakaninmu sau da yawa namu da marasa ma'ana suke cin karo da mu.Wannan labarin ya bayyana halayen mutanen biyu dalla-dalla.

Lokacin da setInterval ke gudana a bangon mai binciken, mafi karancin tazarar tazara za a canza shi da karfi da karfi zuwa milliseconds 1000, kuma zai tsaya bayan ya yi aiki na wani lokaci. Wannan labarin ya bayyana yadda za'a magance wannan matsalar.

Diskarancin faifai a kan Linux galibi ana haifar da shi ne ta hanyar fayilolin shiga da yawa. Amma galibi bamu san inda aka ajiye fayilolin log ɗin ba. A wannan gaba, muna buƙatar duba girman layin kundin adireshi ta hanyar ɗauka don nemo wurin fayil ɗin. Wannan labarin yana gabatar da umarni akan Linux don duba girman fayil na kundin adireshi.

Lokacin tattarawa da girka Redis5 akan CentOS7, akwai kuskuren da ba'a iya samun jemalloc.h ba. Wannan labarin ya bayyana yadda za'a warware shi.

Lokacin tattarawa da shigar da Python3, akwai kuskure a cikin taken. Wannan labarin ya bayyana yadda za'a warware shi.

Diodes abubuwa ne da ake amfani da kayan lantarki sosai. Wannan labarin yafi gabatar da halaye na gaba da na baya na diodes.

Lokacin da muke rubuta lamba, koyaushe akwai kurakurai a wasu wurare, kuma waɗannan kurakuran ba za a iya kauce musu ba kuma ana iya yin watsi da su.A wannan lokacin, za mu iya amfani da murƙushe kuskuren PHP don toshe kurakurai.

Amfani da YUM don girka software yafi dacewa fiye da tattarawa da girkawa. Amma idan sabarmu ba ta da IP na jama'a a cikin hanyar sadarwar cikin, muna buƙatar haɗi zuwa hanyar sadarwar jama'a ta hanyar uwar garken wakili. Wannan labarin yana bayanin yadda zaka saita wakili na SOCKS5 don YUM.

Apache shine software mafi amfani da sabar gidan yanar gizo. Tana iya aiki a kusan dukkan dandamali na komputa da aka yi amfani da ita sosai.Saboda yadda take amfani da tsarinta kuma ana amfani da tsaro, yana daya daga cikin shahararrun masarrafan yanar gizo. Wannan labarin ya bayyana dalla-dalla yadda za a girka Apache akan CentOS7.

.NET dandalin ci gaba ne na Microsoft, saboda yana iya aiki da Windows ne kawai a farkon kwanakin, yana da iyakancewa da yawa. Amma sabon .NET Core ya rigaya yana goyan bayan gudana akan Linux. Wannan labarin yayi bayanin dalla-dalla yadda za a girka .NET Core akan CentOS7.

MySQL shine tushen tushen tushen tushen tushen tushen tushen tushen tushen tushe. MySQL8 ya fi tsayayyar aiki da haɓaka tsaro fiye da sigar da ta gabata. A lokaci guda, MySQL8 ya kuma inganta abubuwa da yawa a cikin aikin. Wannan labarin yayi bayanin dalla-dalla yadda za a girka da saita MySQL8 akan CentOS7.

SVN shine taƙaitawar ɓarna, tsarin sarrafa sigar buɗe ido. Yawanci ana amfani dashi ga mutane da yawa don haɓaka aikin guda ɗaya tare, don samun albarkatun da aka raba, da kuma kyakkyawan tsarin gudanarwa. Wannan labarin ya bayyana dalla-dalla yadda za a girka sabis na SVN akan CentOS7.

MariaDB reshe ne na MySQL. Amfani da shi daidai yake da MySQL, amma yana tallafawa ƙungiyoyi masu yawa, wanda ya bambanta da yanayin bawa-bawa na MySQL. Wannan labarin ya bayyana dalla-dalla yadda za a girka MariaDB 10.4 akan CentOS7.

Idan muna buƙatar ƙarawa da ragi kwanakin da lokuta a cikin MySQL, zamu iya amfani da: DATE_ADD, DATE_SUB, ADDDATE, SUBDATE, wannan labarin yana bayanin amfani da waɗannan ayyukan dalla-dalla.

Yawancin lokaci muna buƙatar kama kurakuran duniya a cikin PHP sannan mu yi rikodin rajistan ayyukan, don haka za mu iya samun matsalolin matsaloli a cikin shirin a kan lokaci. Amma bayan mun saita aikin kira na kuskure tare da set_error_handler, har yanzu ba za mu iya kama kurakuran matakin FATAL ba. Wannan labarin yana bayanin yadda za'a kama kurakuran matakin FATAL da aka samar yayin aikin PHP.

EMQX sabar MQTT ce cikakkiya .. Wannan labarin yana bayanin yadda ake ƙirƙirar lambar izini don kiran ƙirar API na EMQX.

EMQX kyakkyawar uwar garken MQTT ne .. Wannan labarin yana bayanin yadda zakuyi amfani da lambar ku don sarrafa izini lokacin da abokan hulɗa masu wayo suka haɗa kai tsaye zuwa sabis da kuma biyan kuɗi don buga batutuwa.

EMQX kyakkyawan uwar garken saƙo ne na MQTT. Wannan labarin yayi bayanin dalla-dalla yadda za a girka EMQX akan CentOS7.