Video: Puas yog JSON muaj hom hnub?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
JSON Hnub tsis yog hnub - lawv yog Strings
Yog li txhawm rau sawv cev hnub hauv JavaScript, JSON siv ib txoj hlua tshwj xeeb - ISO 8601 - rau encode hnub raws li txoj hlua. Koj ua tau serialize rau hom ntawv no, tab sis tsis muaj qhov ncaj qha deserialization rov qab mus rau a hnub los ntawm nws.
Ib yam li ntawd, hnub tim hom ntawv hauv JSON yog dab tsi?
Lub neej ntawd hom ntawv siv los ntawm Json . NET yog tus qauv ISO 8601: "2012-03-19T07:22Z". Ua ntej Json NET 4.5 hnub tim tau sau siv Microsoft hom ntawv : "/ Hnub tim (1198908717056)/".
Ib yam li ntawd, hom twg tsis tau txais kev txhawb nqa los ntawm JSON? JSON qhov tseem ceeb tsis tuaj yeem yog ib qho ntawm cov ntaub ntawv hauv qab no hom : ib function. ib hnub.
Yam ntaub ntawv siv tau
- ib txoj hlua.
- ib tus lej.
- ib yam khoom (JSON object)
- ib array.
- ib boolean.
- null.
Xav txog qhov no, hom ntaub ntawv twg yog ib feem ntawm JSON tus qauv?
JSON txhawb nqa 6 hom ntaub ntawv: hlua. tus lej. boolean . null.
JSON teb yog dab tsi?
JavaScript Object Notation ( JSON , hais tau /ˈd?e?s?n/; kuj /ˈd?e?ˌs?n/) yog hom ntaub ntawv qhib lossis cov ntaub ntawv sib pauv uas siv tib neeg cov ntawv nyeem kom xa cov ntaub ntawv cov khoom uas muaj tus cwj pwm-tus nqi khub thiab cov ntaub ntawv array (lossis lwm yam khoom muaj nqis serializable).
Pom zoo:
Lub hom phiaj ntawm hom lus hom lus yog dab tsi?
Hom Lus Specification. Ib Hom Lus Qhia Tshwj Xeeb (CLS) yog ib daim ntawv uas hais tias yuav ua li cas cov khoos phis tawj tuaj yeem hloov mus rau hauv Cov Lus Qhia Nruab Nrab (CIL) code. Thaum ntau hom lus siv tib bytecode, qhov sib txawv ntawm qhov kev pab cuam tuaj yeem sau ua hom lus sib txawv
Yuav ua li cas hloov ib hnub hom mus rau lwm hnub hauv SQL?
Yuav ua li cas kom tau txais SQL neeg rau zaub mov sib txawv hnub hom Siv lub hnub hom kev xaiv nrog rau CONVERT muaj nuj nqi. Kom tau YYYY-MM-DD siv SELECT CONVERT(varchar, getdate(), 23) Kom tau MM/DD/YYYY siv SELECT CONVERT(varchar, getdate(), 1) Mus saib daim ntawv kom tau ib daim ntawv teev tag nrho cov hom kev xaiv
Dab tsi yog qhov txawv ntawm SQL hnub thiab Util hnub?
Hnub tim yog ib daim ntawv nyias nyias nyob ib ncig ntawm millisecond tus nqi uas yog siv los ntawm JDBC los txheeb xyuas hom SQL DATE. Hnub tim tsuas yog sawv cev DATE yam tsis muaj cov ntaub ntawv sijhawm thaum java. siv. Hnub tim sawv cev rau cov ntaub ntawv Hnub thiab Lub Sijhawm
Puas yog Amazon kwv yees hnub xa khoom muaj tseeb?
Tus lej taug qab feem ntau muaj qhov tseeb dua hnub xa khoom. Pom tseeb, koj tsis tuaj yeem ua qhov no rau cov neeg siv khoom uas tsis tau xaj, tab sis tsawg kawg, yog tias lawv nug txog nws thaum lawv xaj, koj tuaj yeem qhia lawv qee yam zoo dua li Amazon cov ntaub ntawv
Hnub twg yog hnub zoo tshaj los tshaj tawm hauv twitter?
Lub sijhawm zoo tshaj plaws los tshaj tawm hauv Twitter: Wednesday thaum 9 teev sawv ntxov thiab Friday thaum 9 teev sawv ntxov Hnub zoo tshaj plaws: Tuesday thiab Wednesday yog hnub zoo tshaj plaws los tshaj tawm hauv Twitter. Kev sib koom ua ke feem ntau: Monday txog Friday thaum 8 teev sawv ntxov txog 4 teev tsaus ntuj