Video: Qhov txawv ntawm chav kawm thiab style yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Yog li cov qhov sib txawv ntawm ob qho tib si yog koj tuaj yeem rov siv dua chav kawm whereas koj tsis tuaj yeem rov siv dua inline hom.
Ntxiv rau qhov no, qhov txawv ntawm chav kawm thiab tus ID yog dab tsi?
Hauv CSS, ib chav kawm selector yog lub npe ua ntej los ntawm qhov nres tag nrho (".") thiab ib qho ID selector yog lub npe ua ntej los ntawm tus cim hash ("#"). Cov qhov sib txawv ntawm ib ID thiab a chav kawm yog tias ib ID tuaj yeem siv los txheeb xyuas ib lub ntsiab lus, whereas a chav kawm tuaj yeem siv los txheeb xyuas ntau dua ib qho.
Tsis tas li ntawd, kuv yuav tsum siv ID lossis chav kawm? Cov chav kawm selector siv HTML chav kawm attribute, thiab txhais tau tias "." id yog siv thaum peb yuav tsum siv CSS cov cuab yeej rau ib tus cwj pwm nkaus xwb. chav kawm yog siv thaum peb yuav tsum siv CSS cov cuab yeej hauv ntau qhov chaw hauv tib nplooj ntawv lossis txawv. A chav kawm tsis yog tshwj xeeb thiab siv rau ntau yam.
Ib yam li ntawd, chav kawm hauv CSS yog dab tsi?
Basic CSS : Siv a CSS Class rau Style ib Element. Cov chav kawm yog reusable styles uas yuav muab ntxiv rau HTML ntsiab. Hauv koj cov ntsiab lus HTML ' chav kawm attribute, ua chav kawm lub npe tsis suav nrog lub sijhawm. Hauv koj lub caij style, hloov h2 selector rau. liab-ntawv nyeem thiab hloov kho xim tus nqi ntawm xiav rau liab.
Dab tsi yog qhov txawv ntawm ng class thiab Ng style?
3 Teb. ng - style yog siv los interpolate javascript object rau hauv style attribute, tsis yog css chav kawm . Thiab ng - chav kawm cov lus qhia txhais koj cov khoom rau hauv chav kawm tus cwj pwm. Hauv qab no yuav muab txhais rau chav kawm ="deleted" thaum isDeleted sib txawv yog muaj tseeb.
Pom zoo:
Dab tsi yog qhov txawv ntawm chav kawm sab hauv thiab cov chav nested?
Cov chav kawm uas tau tshaj tawm yam tsis siv qhov zoo li qub yog hu ua chav kawm sab hauv lossis chav kawm tsis zoo li qub. Cov chav kawm Staticnested yog chav kawm zoo li lwm cov tswv cuab zoo li qub ntawm cov chav kawm sab nrauv. Txawm li cas los xij, cov chav kawm sab hauv yog khi toinstance thiab nws tuaj yeem nkag mus rau cov tswv cuab ntawm pawg enclosingclass
Dab tsi yog ob chav kawm tshwj xeeb hauv hierarchy ntawm Java zam chav kawm?
Chav Kawm Exception muaj ob lub ntsiab subclasses: IOException class thiab RuntimeException Class. Hauv qab no yog cov npe ntawm feem ntau kuaj xyuas thiab tsis tau txheeb xyuas Java's Built-in Exceptions
Chav kawm piav qhia txog tus qauv ntawm chav kawm yog dab tsi?
Nyob rau hauv object-oriented programming, ib chav kawm yog ib tug template txhais ntawm txoj kev s thiab txawv txawv s nyob rau hauv ib tug tej yam khoom. Yog li, ib yam khoom yog ib qho piv txwv tshwj xeeb ntawm chav kawm; nws muaj cov txiaj ntsig tiag tiag tsis yog hloov pauv. Cov qauv ntawm ib chav kawm thiab nws cov subclasses yog hu ua chav kawm hierarchy
Dab tsi yog qhov txawv ntawm qhov piv txwv hauv zos thiab chav kawm sib txawv?
Cov kev hloov hauv zos tsis pom sab nraum txoj kev. Cov piv txwv sib txawv tau tshaj tawm hauv chav kawm, tab sis sab nraum ib txoj hauv kev. Lawv kuj raug hu ua cov tswv cuab lossis cov kev hloov pauv. Class/static variables tau tshaj tawm nrog lo lus tseem ceeb zoo li qub hauv chav kawm, tab sis sab nraum ib txoj kev
Dab tsi yog qhov zoo sib xws thiab qhov txawv ntawm relays thiab PLC yog dab tsi?
Relays yog electro-mechanical keyboards uas muaj coil thiab ob hom kev sib cuag uas tsis yog NO & NC. Tab sis Programmable Logic Controller, PLC yog lub khoos phis tawj me uas tuaj yeem txiav txim siab raws li qhov kev zov me nyuam thiab nws cov tswv yim & tso tawm