Cov txheej txheem:

Lub npe () hauv XPath yog dab tsi?
Lub npe () hauv XPath yog dab tsi?

Video: Lub npe () hauv XPath yog dab tsi?

Video: Lub npe () hauv XPath yog dab tsi?
Video: txhob hnov qab kuv lub npe - Bee lee [Official MV] 2022-23 2024, Kaum ib hlis
Anonim

hauv zos - npe . Cov hauv zos - npe function xa ib txoj hlua sawv cev rau lub npe hauv zos ntawm thawj node nyob rau hauv ib tug muab node-set.

Ib yam li ntawd ib tug yuav nug, dab tsi yog text () hauv XPath?

Thaum ntawv() hais txog qhov sib phim nkaus xwb ntawv nyeem uas yog nyob rau hauv txoj hlua daim ntawv. Qhov no yuav yog ib yam khoom ntawm hom Node thaum siv lub XPath muaj nuj nqi ntawv() kom tau ntawv nyeem rau ib lub ntsiab tsuas tau txais cov ntawv nyeem mus txog rau thawj lub hauv paus.

Tsis tas li ntawd, XPath Nodeset yog dab tsi? Node teeb yog ib qho ntawm plaub hom ntaub ntawv yooj yim uas tau xa rov qab los ntawm XPath cov lus qhia. Qhov no node teeb , uas yog qhov tshwm sim ntawm ib qho XPath kev qhia siv nyob rau hauv ib tug xaiv attribute nyob rau hauv ib tug transformation, muaj ib tug cwj pwm zoo li a node teeb los ntawm XML Document Object Model (DOM).

Ntxiv rau qhov no, XPath muaj nuj nqi dab tsi?

XPath node muaj nuj nqi muab cov node ntsig txog kev ua haujlwm xws li kawg(), txoj hauj lwm(), id(), suav()

  • node(): muaj nuj nqi rov qab tus nqi.
  • text(): muaj nuj nqi rov qab tus nqi ntawm cov node tshwj xeeb.
  • comment(): function matches comment node and return that specific comment node.

dynamic XPath yog dab tsi?

Dynamic XPath . Dynamic XPath kuj hu ua kev cai XPath thiab nws yog ib txoj hauv kev los nrhiav cov khoom tshwj xeeb. Dynamic XPath yog siv los nrhiav tus cwj pwm tseeb lossis txo tus lej ntawm qhov sib txuam / qhov tshwm sim los ntawm nplooj ntawv web thiab hauv qab no XPath kab lus siv tau rau tib yam: Muaj. Kwv tij.

Pom zoo: