Ua ntej CSS - thawj, nyiam, tswv yim

Pseudo-hais thiab pseudo-chav kawm CSS: ua ntej, tom qab, yuj, nquag, thiab lwm yam - zoo lub caij nyoog los txhim kho qhov zoo thiab piv cov tiav site, tsis xws li JavaScript-handler code rau lub cuab, tsis txhob yuav tsum tau ib tug complex cov tshuaj tiv thaiv designs, hais cov txheej xwm, dialogues thiab cov kev ua ntawm cov qhua.

Pseudo yooj yim, multifunctional, muaj teeb meem loj thiab ntau yam kev xaiv thaj chaw rau tej yam yooj yim thiab complex copyright lauj kaub: yuav ua li cas thawj kos xim, seamlessly qhia ntxiv cov kev ua yuav ua rau ib tug hint nyob rau hauv txoj cai qhov chaw.

Great zeem muag qhib thaum teev url () nyob rau hauv lub txheem ntawm pseudo. Tseeb, qhov kev xaiv no yuav qhib li tshiab horizons, ob qho tib si nyob rau hauv cov nqe lus ntawm download dab tsi rau cov nplooj ntawv, thiab tau ua kom tau dab tsi nyob qhov twg

Ib tug txawv feature ntawm pseudo

Pseudo (:: ua ntej CSS, :: tom qab) sib txawv los ntawm lub ntsiab, selectors thiab pseudo-chav kawm uas tsis muas thaum chiv thawj muaj nyob rau hauv daim ntawv tsob ntoo. Tej zaum, nyob rau hauv kev xyaum nws tsis yog tshwj xeeb yog ib qho tseem ceeb, tab sis yog hais tias peb xav txog cov nqe lus nug ntawm ib tse nrog koj cov ntsiab lus rau ntawm qhov chaw, koj tso siab rau cov ntsiab lus khoom teejtug uas yog ib yam dab tsi muaj nuj nqis rau cov kev tshawb fawb cav tsis ua kev zoo siab.

Pseudo :: ua ntej CSS tso cai rau koj ntxiv cov ntsiab lus rau lub caij, thiab :: tom qab - tom qab. Txheem tej zaum yuav txawv los ntawm tej yam yooj yim ntawv nyeem los complex formatting nyob rau hauv cov nqe lus ntawm CSS zog, tab sis tsis muaj HTML cim npe. Pseudo yuav txig positioned nyob rau hauv lub caij, uas yog txuas mus rau, vim hais tias cov ntsiab lus ua ntej thiab tom qab yog txheeb ze thiab mobile. Koj yuav tsis cia li qhia kom meej rau txoj hauj lwm, tab sis kuj ntau thiab tsawg pab, xim, haiv, fonts, thiab siv lwm yam nta ntawm CSS.

Raws li pseudo lub CSS, tus ua ntej thiab tom qab yog preceded by lub cim ":", tab sis CSS3 txheem pom zoo "::". Sim ib qho kev siv nyob rau ib nplooj ntawv yeej yuav tsis ua ntau tshaj li ib co browsers los yog versions tej zaum yuav tsuas yog tsis pom ib tug pseudo.

General ntsiab lus uas siv

By muab, e.g., div caij piav txog class = 'scElement' thiab cov ntsiab lus "Caij" rau cov nplooj ntawv, cim tias seb thaum nyob rau hauv CSS-style daim ntawv piav qhia txog:

.scElement {
CHAW ...;
z-index ...;
...

}

koj muaj peev xwm thov ib tug pseudo ": yuj" pseudo thiab ":: ua ntej" CSS:

.scElement: yuj :: ua ntej {ntsiab lus: 'prefix'; xim ...; tom qab-xim ...;}.

Ces thaum koj yuj tus nas pointer ua ntej lo lus 'Caij' yuav tshwm sim lo lus 'prefix', uas yuav hloov cov xim ntawm cov tsiaj ntawv thiab tom qab.

Cov ntsiab lus variations pseudo

Yog hais tias koj tsis qhia kom meej pseudo zog, lawv yuav tsum yog tib yam li hais tias ntawm lub ntsiab keeb - scElement. Koj yuav tau qhia lub url, thiab ces cov ntsiab lus vaj tse: url ( '/ scBox / rm-v / sc-rights.png') thaum lub cursor qhia tau hais tias cov duab nyob rau hauv lub caij. Nyob rau hauv cov ntaub ntawv ntawm cov ntsiab lus: "\ 03B1" zoo nkaus li zauv cim "Alpha", tab sis siv cov cim tshwj xeeb: "& NBSP;", " & lt;", "& laquo;", "& raquo;" thiab lwm tus neeg ua tsis tau - lawv yuav tsum tau tso tawm li no.

Pub ib tug ntau ntawm kev xaiv kom meej cov ntsiab lus ntawm pseudo-: txwm "nyeem", url (), ib tug sib lawv liag ntawm hexadecimal cim, xa mus rau: qhib-quote / close-quote, los yog tsis muaj-qhib-quote / tsis muaj-ze-quote, etc. Raws li tej zaum yuav ua tau ib tug hais txog ntawm tus tsis txoj hauj lwm ntawm cov ntsiab lus. los ntawm style zog, uas tso npe thov ua ntej, CSS yuav tso lub pseudo nyob qhov twg nyob rau hauv lub caij uas nws yog kev cob cog rua.

Koj yuav muab lub simultaneous siv ua ntej thiab tom qab. Yog li ntawd, muab siv CSS ua ntej cov ntsiab lus cim, koj yuav tau txais ib tug ntau yam los ntawm, sib txuas sib txawv pseudo-chav kawm thiab pseudo-hais, surprise tus qhua, tsis siv nyob rau tib lub sij hawm txawm ib byte-code JavaScript.

nta pseudo

Rau lawv designations saws ":" cim, raws li zoo raws li rau xa mus rau pseudo, tab sis tsis zoo li CSS3 pseudo feem ntau denoted los ntawm "::". Browsers uas to taub nws, pom ob designations. Ncua nyob rau hauv cov ntaubntawv povthawj siv yog tsis tso cai, cov hlua raug kaw thiab pseudo (los yog xwb) pseudo kaw ua ke:

scElement: yuj :: ua ntej {ntsiab lus: 'prefix'; ...}

scElement: active: tom qab {ntsiab lus: 'suffix'; ...}

Nws yog ib qho tseem ceeb yuav tau nco ntsoov: CSS ua ntej yuav khiav tawm ntawm qhov chaw cov ntsiab lus. Yeej tsis muaj feem xyuam rau cov ntsiab lus ntawm cov nplooj ntawv. Pseudo - yog tsis muaj exception. Lawv tsis tshwm sim nyob rau hauv lub dom tsob ntoo thiab undesirable siv lawv nyob rau hauv cov seem ntawm lub site - nyob rau hauv cov ntsiab lus, lawv yuav tsis tau txais.

Siv cov "" thiab "::" yog txaus siab los ntawm mobile platforms thiab niaj hnub browsers, tab sis mus saib rau ntawm kev ua hauj lwm nyob rau hauv cov laus versions feem ntau yog tsis superfluous.

Cov ntsiab lus ntawm pseudo-tsis muaj nyob rau hauv lub site lub ntsiab lus. Nws yuav tsis pom cov kev tshawb fawb xyaw. Yuav ua li cas siv qhov teeb meem - nyob rau cov kev teeb meem no, tab sis tseem siv CSS ua ntej, raws li zoo raws li tom qab, nws tus kheej los yog nyob rau hauv ib tug complex, interesting thaum cov ntsiab lus yog ib tug url (). Direct siv cov ntsiab lus pseudo li mus rau ntawm qhov chaw, yuav cia nws mus download tau ib cov ntaub ntawv, piv txwv li, ib daim duab.

Muaj peev xwm mus hloov cov style ntaub ntawv online (lam style los xij cov ntaub ntawv - tsis muaj exception) tsis cuam tshuam nrog daim ntawv no thiab siv pseudo raws li nws yog yooj yim thaum twg muab lub sij hawm, nyob rau hauv txoj cai qhov chaw algorithm, nyob ntawm seb cov qhua ua.