Video: Ajax yuam kev yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Lub ntsiab lus. Qhov no tshwm sim thaum jQuery poob rau hauv nws yuam kev callback handler (qhov no hu rov qab ua rau hauv DataTables), uas feem ntau yuav tshwm sim thaum lub server teb nrog lwm yam uas tsis yog 2xx HTTP txheej xwm code.
Yog li ntawd, Ajax txhais li cas?
AJAX = Asynchronous JavaScript thiab XML. AJAX yog ib txoj hauv kev los tsim cov nplooj ntawv web sai thiab dynamic. AJAX tso cai rau cov nplooj ntawv web kom hloov kho asynchronously los ntawm kev sib pauv cov ntaub ntawv me me nrog cov neeg rau zaub mov tom qab. Qhov no txhais tau tias tias nws muaj peev xwm hloov kho qhov chaw ntawm nplooj ntawv web, tsis tas yuav rov qab tag nrho nplooj ntawv.
Tsis tas li, koj yuav ua li cas thiaj li ua yuam kev hauv Ajax hu? Qhov zoo tshaj plaws ua npuas uas yuam kev los ntawm tus neeg rau zaub mov sab (siv php) mus rau tus neeg siv khoom sab yog xa cov header los ntawm Ajax thov qhov chaw hauv 400's (uas ib txwm cuam tshuam nrog yuam kev ). Ib zaug lub Ajax thov tau txais qhov no nws yuav ua rau koj yuam kev muaj nuj nqi.
Qhov thib ob, qhov kev thov Ajax yog dab tsi?
Ib AJAX thov yog a thov ua los ntawm ib AJAX daim ntawv thov. Feem ntau, nws yog HTTP thov tsim los ntawm (browser-neeg nyob) Javascript uas siv XML los encode lub thov cov ntaub ntawv thiab/los yog cov ntaub ntawv teb.
Dab tsi yog dataType hauv Ajax?
Hom ntaub ntawv puas yog koj qhia jQuery seb yuav teb li cas. Cia siab tias JSON, lossis XML, lossis HTML, thiab lwm yam. Lub neej ntawd yog rau jQuery sim thiab txheeb xyuas nws.
Pom zoo:
Dab tsi yog qhov sib txawv loj ntawm kev txheeb xyuas qhov yuam kev thiab kev kho cov lej yuam kev?
Ob qhov kev tshawb nrhiav qhov yuam kev thiab kev kho qhov yuam kev yuav tsum muaj qee qhov ntawm cov ntaub ntawv rov qab xa mus nrog cov ntaub ntawv tiag tiag; kev kho yuav tsum muaj ntau tshaj li kev tshawb nrhiav. Parity bits yog ib txoj hauv kev yooj yim rau kev tshawb nrhiav qhov yuam kev. Ib qho parity me ntsis yog ib qho ntxiv me ntsis xa nrog cov ntaub ntawv uas tsuas yog 1-ntsis suav ntawm cov ntaub ntawv
Dab tsi yog tus yuam sij ntiag tug thiab pej xeem tus yuam sij hauv Blockchain?
Thaum ib tug neeg xa koj cryptocoins hla Blockchain, lawv tau xa lawv mus rau qhov hashed version ntawm qhov hu ua "Public Key". Muaj lwm tus yuam sij uas zais ntawm lawv, uas yog hu ua "Private Key." Qhov Private Key no yog siv los muab Public Key
Cov yuam sij tseem ceeb thiab cov yuam sij txawv teb chaws yog dab tsi?
Relation of Primary Key vs Foreign Key Ib lub ntsiab tseem ceeb tshwj xeeb qhia cov ntaub ntawv nyob rau hauv lub rooj sib tham database, whereas tus yuam sij txawv teb chaws yog hais txog lub teb nyob rau hauv ib lub rooj uas yog lub ntsiab tseem ceeb ntawm lwm lub rooj
Vim li cas kev cob qhia yuam kev tsawg dua qhov kev xeem yuam kev?
Kev cob qhia yuam kev feem ntau yuav tsawg dua qhov kev xeem yuam kev vim tias tib cov ntaub ntawv siv los ua kom haum tus qauv yog ua haujlwm los ntsuas nws qhov kev kawm yuam kev. Ib feem ntawm qhov tsis sib xws ntawm qhov kev cob qhia yuam kev thiab qhov kev xeem yuam kev yog vim tias cov txheej txheem kev cob qhia thiab cov ntawv xeem muaj qhov sib txawv ntawm cov khoom siv
Tus yuam sij tseem ceeb thib ob thiab tus yuam sij txawv teb chaws yog dab tsi?
Txawv Teb Chaws Tseem Ceeb: Yog Lub Ntsiab Tseem Ceeb ib lub rooj tshwm (hloov-hais) hauv lwm lub rooj. Secondary (los yog lwm txoj kev) Key: Puas yog ib qho chaw hauv lub rooj uas tsis raug xaiv los ua ib qho ntawm ob hom saum toj no