Tej Yam Koj Yuav Tsum Ziag Tsis Muaj hauv XML
Lus Askiv XML (Extensible Markup Language) yog ib qho yooj yim heev uas tsuas yog hais txog leej twg thiaj li txawj siv nws. Txoj kev tuaj yeem yog qhov txiaj ntsig ntawm qhov hom lus. Lub drawback rau XML yog tias cov cai uas muaj nyob hauv cov lus tsis yog. XML parsers tawm me ntsis chav tsev yuam kev. Txawm hais tias koj yog tus tshiab rau XML los yog tau ua haujlwm nyob rau hauv hom lus rau xyoo, tib qho kev ua yuam kev tuaj yau nce dua. Cia peb sim saib cov neeg ua txhaum yuam kev ntau thaum tsim cov ntaub ntawv hauv XML xwv kom koj tuaj yeem kawm tau kom tsis txhob muaj kev yuam kev hauv koj tus kheej txoj haujlwm!
01 ntawm 05
Kev Lees Paub Txog Kev Lees Paub
Dua li ntawm tag nrho lawv cov kev txawj ntse, cov computers tsis tuaj yeem xav txog lawv tus kheej thiab siv qhov kev xav ua kom paub txog dab tsi hauv lwm yam. Koj yuav tsum qhia cov lus nrog ib daim ntawv tshaj tawm kom tus browser nkag siab txog cov cai uas koj yuav sau. Tsis nco qab daim ntawv no thiab tus browser yuav tsis muaj lub tswv yim uas yam lus koj siv thiab yuav, yog li ntawd, tsis tuaj yeem ua ntau ntau nrog txoj cai uas koj sau.
02 ntawm 05
Unnested ntsiab lossis ntawv nyeem
XML ua haujlwm nyob rau hauv lub hierarchical style. Qhov no txhais tau hais tias:
- Tag nrho tus me nyuam yuav tsum muaj niam txiv.
- Tag nrho cov ntaub ntawv cov hlua yuav tsum nyob ntawm cov cim npe.
- Tag nrho cov lus yuav tsum nyob sab hauv cov ntawv tawm tswv yim.
03 ntawm 05
Cov Cim Qhib
XML yuam kom koj kaw tag nrho cov cim npe uas koj qhib. Ib lossis xws li yuav tsum tau kaw nws. Koj tsis tuaj yeem tawm ntawm txoj kev qhib dai cia! Hauv HTML , koj tuaj yeem tau nrog cov qee zaum qhib tag, thiab qee cov browsers yuav kaw cov cim npe rau koj thaum lawv ua ib nplooj ntawv. Cov ntaub ntawv kuj tseem yuav tau parse txawm tias tsis zoo-tsim. XML yog ntau fussier dua li ntawd. Ib daim ntawv XML nrog kev qhib tag yuav tsim ib qho yuam kev ntawm qee qhov chaw.
04 ntawm 05
Tsis muaj Root Element
Vim XML ua haujlwm nyob rau hauv ib tsob ntoo-qauv, txhua nplooj ntawv XML yuav tsum muaj lub hauv paus caij ntawm lub apex ntawm tsob ntoo. Lub npe ntawm lub caij tsis tseem ceeb, tab sis nws yuav tsum muaj los yog cov cim npe uas ua raws li yuav tsis yog qhov zoo.
05 ntawm 05
Ntau Cov Cwj Pwm Coj Dawb
XML interprets 50 dawb paug chaw nws tib yam.
XML Code: Nyob zoo lub ntiaj teb!
Tsim tawm: Nyob zoo ntiaj teb!
XML yuav siv ntau qhov chaw nrawm, hu ua cov cim kos duab dawb, thiab cog lawv mus rau hauv ib qhov chaw. Nco ntsoov, XML yog hais txog nqa cov ntaub ntawv. Nws tsis yog hais txog qhov kev nthuav qhia ntawm cov ntaub ntawv ntawd. Nws tsis muaj dab tsi ua nrog kev pom duab lossis tsim. Ib qhov chaw dawb siv los kho cov ntawv txhais tau tias tsis muaj dab tsi nyob rau hauv XML code, yog li yog tias koj tau ntxiv ntau qhov chaw ntxiv sim hais txog qee yam ntawm kev teeb tsa qhov muag pom los tsim, koj tab tom nyiag koj lub sijhawm.
Sau los ntawm Jeremy Girard