Ngaphambi CSS - yokuqala, ukhululekile, kwenta

Pseudo-izakhi futhi mbumbulu amakilasi CSS: ngaphambi, ngemuva, hambisa, esebenzayo, njll - ithuba ngempumelelo ukuthuthukisa ikhwalithi kanye lula indawo kokubulawa, angafaki esine-isibambi khodi sobala, angadingi eziyinkimbinkimbi ukuphendula imiklamo, izakhi izenzakalo, inkhulumomphendvulwano kanye nezenzo isivakashi.

Pseudo elula, Amatebhe, abalulekile futhi multiple choice Izakhiwo elula eziyinkimbinkimbi okuzikhulula-copyright: indlela yokuqala ukuziqhakambisa, ngaphandle komzamo ukucacisa izenzo ezidingekayo ukuze alethe mfana endaweni efanele.

amathemba Omkhulu ukuvula i-url lapho esibekiwe () e okuqukethwe mbumbulu. Ngempela, le ndlela luvula khathizwe entsha, kokubili ngokoMthetho thwebula lutho ekhasini, futhi ukusebenza kwawo kungenzeka noma yini noma kuphi

Isici esiphawulekayo mbumbulu

Pseudo (:: phambi CSS, :: emva) ezahlukene kusukela izakhi, kubakhethi futhi mbumbulu amakilasi ukuthi akazange ekuqaleni khona isihlahla dokhumenti. Mhlawumbe, practice akusiyo kubaluleke ngokukhethekile, kodwa uma sicabanga umbuzo ukubeka okuqukethwe kusayithi, obathembayo impahla okuqukethwe okuthile okunenjongo ngoba injini yokusesha akwenzi mqondo.

Pseudo :: phambi CSS ikuvumela ukuba wengeze okuqukethwe kungxenye, futhi :: ngemva - emva. Okuqukethwe zingahluka kusuka umbhalo elula ukufomatha eziyinkimbinkimbi ngokuya CSS izakhiwo, kodwa akukho amathegi e-HTML. Pseudo kungenziwa kahle kahle ngaphakathi isici, ehambisana, ngoba okushiwo ngaphambi nangemva lilinganiselwe neselula. Awukwazi nje ucacise isikhundla, kodwa futhi osayizi, imibala, izizinda, amafonti, futhi asebenzise nezinye izici CSS.

Njengoba mbumbulu CSS, ngaphambi nangemva basuke beqale ngokukipita uphawu ":", kodwa CSS3 ejwayelekile Kunconywa "::". Ukuze ukuhlola ukusetshenziswa ikakhulukazi ekhasini akasoze abe ngaphezu kwezinye iziphequluli noma izinhlelo angase nje uqaphele ukuthinteka mbumbulu ethile.

Imigomo Jikelele yokusetshenziswa

Ngokubeka, isib, hlukanisa isici echaza class = 'scElement' futhi okuqukethwe "elementi" ikhasi, okubonisa ku-CSS-isitayela incazelo leshidi:

.scElement {
ISIMO ...;
z-index ...;
...

}

ungasebenzisa mbumbulu ": hambisa" mbumbulu futhi ":: phambi" CSS:

.scElement: hambisa :: phambi {okuqukethwe: 'Isiqalo'; umbala ...; umbala ongemuva ...;}.

Khona-ke uma uhamba pointer igundane phambi elithi 'elementi' izovela elithi 'Isiqalo', okuzoshintsha umbala izincwadi kanye nesizinda.

ukuhlukahluka kokuqukethwe mbumbulu

Uma ungenalo ucacise izindawo mbumbulu, bayoba kuyafana nalokho timphawu main - scElement. Ungaveza url, bese impahla okuqukethwe:-url ( '/ scBox / rm-v / sc-rights.png') lapho isikhombisi sikhombisa isithombe isici. Endabeni okuqukethwe: "\ 03B1" livela zezibalo uphawu "alfa", kodwa sebenzisa izinhlamvu ezikhethekile: "& nbsp;", " & lt;", "& laquo;", "& raquo;" , abanye bengazi - bona ziyobonakala njengoba.

Ivunyelwe eziningi ongakhetha ucacise okuqukethwe pseudo-: "umbhalo" evamile, i-url (), ukulandelana nezinhlamvu-hexadecimal, ubheke: evulekile-quote / eduze lesisho, noma kungekho-evulekile-quote / akukho-eduze lesisho, njll Njengoba kungase kube uphawu lwe-isikhundla ngokuphelele okuqukethwe. ngokusebenzisa isitayela izakhiwo, ngokusebenzisa ngaphambi, CSS uzobeka mbumbulu kuphi element lapho ixhunywe.

Ungakwazi sihlanganise ukusetshenziswa ngesikhathi esisodwa ngaphambi nangemva. Ngakho-ke, ukubeka usebenzisa CSS phambi okuqukethwe izinhlamvu, ungathola ezihlukahlukene imiphumela, ngokuhlanganisa ezahlukene mbumbulu amakilasi futhi mbumbulu izakhi, kusimangaze isivakashi, hhayi ukuchitha ngesikhathi esifanayo ngisho ibhayithi-nekhowudi-JavaScript.

Izici mbumbulu

Ukuze namagama abo bamukela ":" uhlamvu, kanye ubheke mbumbulu, kodwa ngokungafani CSS3 mbumbulu ngokuvamile yi- "::". Iziphequluli ukuthi baqonde ke, bayaqonda kokubili namagama. Kushiya tikhala ukuqopha akuvunyelwe, string usurekhodwa nemithi yamanga (noma kuphela) mbumbulu eqoshiwe ndawonye:

scElement: hambisa :: phambi {okuqukethwe: 'Isiqalo'; ...}

scElement: asebenzayo: ngemva {okuqukethwe: 'Isijobelelo'; ...}

Kubalulekile ukukhumbula: CSS phambi liphelelwa okuqukethwe site. Izitayela kungukuthi ezihlobene nokuqukethwe ekhasini. Pseudo - iyathinteka. Abanaso avele esihlahleni se-DOM futhi engathandeki ebasebenzisa izigaba ezifanele isayithi - okuqukethwe, ngeke uthole.

Ukusebenzisa "" futhi "::" isekelwa ezisekelweni mobile kanye iziphequluli yesimanje, kodwa hlola umsebenzi izinguqulo ezindala ngokuvamile akuzona engadingekile.

Okuqukethwe mbumbulu akufakiwe nokuqukethwe kwesayithi. Ngeke ubone yelucwaningo. Indlela yokusebenzisa lesi simo - incike esimweni esithile, kodwa kungenzeka ngokusebenzisa CSS ngaphambili, kanye ngemva, ngokuzimela noma eziyinkimbinkimbi, ezithakazelisayo lapho okuqukethwe url (). Ukulisebenzisa ngokuqondile kanjena mbumbulu okuqukethwe nezixhumanisi isayithi, kuzokuvumela ukuba ukulanda ifayela, isibonelo, isithombe.

Amandla ukushintsha amafayela isitayela inthanethi (Cascading Style Sheets amafayela - iyathinteka) kungaphazamisi ifomu bese usebenzisa mbumbulu njengoba kulungile nganoma isiphi isikhathi, ngakwesokudla endaweni algorithm, kuye ngokuthi izenzo yesivakashi.