Video: Kev xaiv tsa ntev yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Qhov nrov tshaj plaws hack yog ' Kev xaiv tsa ntev ' - Kev xaiv tsa ntev Hauv paus yuav ua rau HTTP thov rau aserver thiab tom qab ntawd tuav qhov kev sib txuas qhib kom tso cai rau tus neeg rau zaub mov teb tom qab lub sijhawm (raws li kev txiav txim los ntawm server). Pushing outa lus luv heev txhua ob los ntawm tus neeg rau zaub mov (qhov chaw).
Tom qab ntawd, qhov kev xaiv tsa ntev npaum li cas hauv WebSocket?
Siv Kev xaiv tsa : Hauv cov ntsiab lus yooj yim, Luv kev xaiv tsa yog AJAX-raws li lub sijhawm hu xov tooj ntawm kev ncua qeeb thaum Kev xaiv tsa ntev yog raws li Comet (piv txwv li server yuav xa cov ntaub ntawv mus rau tus neeg siv khoom thaum qhov xwm txheej server tshwm sim tsis muaj ncua sijhawm).
Ib tug kuj yuav nug, dab tsi yog qhov kev xaiv tsa ntev hauv Javascript? Nws yog ib qho pheej yig daim ntawv ntawm kev xaiv tsa ntev nyob rau hauv uas tus neeg rau zaub mov khaws cov neeg siv khoom tos rau ib qho kev tshwm sim, xa cov ntaub ntawv hais txog qhov xwm txheej no thiab tom qab ntawd kaw qhov kev sib txuas. Tus neeg siv khoom siv qhov ntawd ua qhov tshwm sim, ua cov ntaub ntawv, tom qab ntawd rov txuas rau lub server kom tos qhov kev tshwm sim tom ntej.
Tsis tas li kom paub, qhov kev xaiv tsa ntev npaum li cas nws ua haujlwm li cas thiab vim li cas koj yuav siv nws?
Nrog kev xaiv tsa ntev , tus neeg thov cov ntaub ntawv los ntawm tus neeg rau zaub mov tib yam li nyob rau hauv tsis tu ncua kev xaiv tsa , tshwj tsis yog nws tawm nws qhov kev thov HTTP / S ( kev xaiv tsa ) ntawm a qeeb qeeb ntau zaus. Cwj Pwm: Tsis txhob xa cov lus teb tsis txaus siab, tus neeg rau zaub mov tuav qhov kev thov qhib thiab tos cov lus teb rau ua muaj.
AJAX ntev kev xaiv tsa yog dab tsi?
Kev xaiv tsa ntev (tseem hu ua AJAX LongPolling ) yog cov txheej txheem siv los simulate cov sijhawm siv tiag tiag. Nws yog ib qho tseem ceeb heev kom nkag siab txog kev siv AJAX polling . Piv txwv li, koj tus email homepage tuaj yeem ua ib qho AJAX thov txhua 30 vib nas this saib seb puas muaj cov email tshiab. Nov yog ib txoj kev AJAX yog siv.
Pom zoo:
Kev xaiv tsa luv luv thiab kev xaiv tsa ntev yog dab tsi?
Kev xaiv tsa yog cov txheej txheem los ntawm cov neeg thov kev pabcuam rau cov ntaub ntawv tshiab tsis tu ncua. Hauv cov ntsiab lus yooj yim, Shortpolling yog AJAX-raws li timer uas hu rau ntawm qhov ncua sij hawm ncua sij hawm ntev yog raws li Comet (piv txwv li server yuav xa cov ntaub ntawv rau tus neeg siv khoom thaum lub server tshwm sim nrog nodelay)
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