Video: Yuav ua li cas koj ntes qhov yuam kev hauv node JS?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Koj yuav tsum paub txog plaub txoj hauv kev tseem ceeb kom xa ib qho yuam kev hauv Node . js : pov lub yuam kev (ua ib qho kev zam ). hla qhov yuam kev rau kev hu rov qab, muaj nuj nqi tshwj xeeb rau tuav yuam kev thiab cov txiaj ntsig ntawm kev ua haujlwm asynchronous.
Xav txog qhov no, koj yuav daws qhov yuam kev hauv Express li cas?
Yog koj xav tau kov ib asynchronous yuam kev , koj yuav tsum xa cov yuam kev in ib qhia yuam kev handler los ntawm kev sib cav tom ntej. Yog tias koj siv Async / tos hauv ib qho Qhia app, koj xav siv wrapper muaj nuj nqi zoo li qhia -async-tus tuav. Qhov no cia koj sau asynchronous code yam tsis tau sim / ntes thaiv.
Tsis tas li ntawd, Epipe yuam kev yog dab tsi? ib qho xwm txheej hauv programming (tseem hu ua POSIX li EPIPE yuam kev code thiab SIGPIPE teeb liab), thaum tus txheej txheem thov cov zis rau cov yeeb nkab lossis lub qhov (socket), uas raug kaw los ntawm cov phooj ywg.
Tsuas yog li ntawd, kuv tuaj yeem siv sim ntes?
Nws ib txwm executes, tsis hais seb qhov kev zam raug pov los yog ntes tau. Koj ua tau zes ib los yog ntau tshaj sim nqe lus. Yog ib sab hauv sim nqe lus ua tsis muaj ib ntes -block, lub enclosing sim cov lus hais ntes -block yog siv xwb. Koj ua tau kuj siv tus sim nqe lus los lis JavaScript kev zam.
Dab tsi yog qhov yuam kev thawj callback hauv node JS?
yuam kev - thawj callbacks # Feem ntau asynchronous txoj kev nthuav tawm los ntawm cov Node . js core API ua raws li tus qauv idiomatic hu ua ib qho yuam kev - thawj hu rov qab . Thaum qhov kev ua haujlwm tiav los yog ib qho yuam kev yog tsa, lub hu rov qab muaj nuj nqi hu ua yuam kev khoom (yog tias muaj) dhau li qhov ua ntej kev sib cav.
Pom zoo:
Dab tsi yog qhov sib txawv loj ntawm kev txheeb xyuas qhov yuam kev thiab kev kho cov lej yuam kev?
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Leej twg tsim qhov yuam kev ntawm qhov yuam kev?
Lub sij hawm tseem ceeb ntawm qhov yuam kev raug tsim nyob rau xyoo 1977 los ntawm tus kws kho mob hlwb Lee Ross. Txawm li cas los xij, kev tshawb fawb txog qhov yuam kev tseem ceeb rov qab mus rau xyoo 1950 thaum cov kws paub txog kev puas siab puas ntsws Fritz Heider thiab Gustav Ichheiser pib tshawb xyuas cov neeg nkag siab txog qhov ua rau tib neeg tus cwj pwm
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