Video: Dab tsi yog qhov injector hauv angular?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov txhaj tshuaj yog lub luag haujlwm tsim cov kev pabcuam thiab txhaj rau hauv cov chav kawm xws li HeroListComponent. Koj tsis tshua tsim ib qho Angular txhaj tshuaj koj tus kheej. Angular tsim txhaj tshuaj rau koj raws li nws executes lub app, pib nrog lub hauv paus txhaj tshuaj uas nws tsim thaum lub sij hawm bootstrap txheej txheem.
Nyob rau hauv tas li ntawd, dab tsi yog lub hauv paus injector nyob rau hauv angular?
Cov Txhaj tshuaj Tsob ntoo. Angular txhaj tshuaj (feem ntau) rov qab singletons. Muaj ib LoginService sau npe nrog lub hauv paus injector . Hauv qab no hauv paus injector yog cov hauv paus @Cov. Cov khoom tshwj xeeb no tsis muaj cov chaw muab kev pabcuam thiab yuav siv cov hauv paus injector rau tag nrho nws cov dependencies.
Kuj Paub, dab tsi yog tus muab kev pabcuam hauv angular? A tus kws kho mob yog ib yam khoom tshaj tawm rau Angular yog li ntawd nws tuaj yeem raug txhaj rau hauv tus tsim qauv ntawm koj cov khoom, cov lus qhia thiab lwm cov chav kawm instantiated los ntawm Angular . Ib qho kev pabcuam yog ib hom tshwj xeeb tus kws kho mob uas tau tshaj tawm nrog nws lub npe chav kawm, raws li koj tuaj yeem pom hauv Angular kev qhia.
Tsis tas li ntawd, dab tsi yog injectors angular 7?
Dab tsi yog Angular Injector . Cov Angular Injector yog lub luag hauj lwm instantiating lub dependency thiab txhaj rau hauv cov khoom los yog kev pab cuam. Cov Txhaj tshuaj nrhiav kev nyob rau hauv lub Angular Cov kws kho mob siv lub token.
Dab tsi yog qhov kev txhaj tshuaj nyob hauv angular 2 nrog piv txwv?
Dependency Txhaj nyob rau hauv Angular . Kev Txhaum Cai (DI) yog lub ntsiab lus tseem ceeb ntawm Angular 2 + thiab tso cai rau chav kawm tau txais kev vam khom los ntawm lwm chav kawm. Feem ntau nyob rau hauv Angular , kev vam meej txhaj tshuaj yog ua los ntawm kev txhaj tshuaj rau hauv chav kawm ua haujlwm lossis chav kawm module.
Pom zoo:
Dab tsi yog qhov dav thawj qhov kev tshawb nrhiav thiab qhov tob thawj qhov kev tshawb fawb?
BFS sawv rau Breadth First Search. DFS sawv cev rau Kev Tshawb Nrhiav Qhov tob. 2. BFS (Breadth First Search) siv Queue cov qauv ntaub ntawv los nrhiav txoj hauv kev luv tshaj. BFS tuaj yeem siv los nrhiav ib qhov chaw luv tshaj plaws hauv cov duab tsis hnyav, vim tias hauv BFS, peb mus txog qhov kawg uas muaj qhov tsawg kawg nkaus ntawm cov npoo los ntawm qhov chaw vertex
Dab tsi yog sparse kem Dab tsi yog qhov zoo thiab qhov tsis zoo?
Koj poob 4 bytes tsis yog ib zaug ib kab; tab sis rau txhua lub cell hauv kab uas tsis yog null. Qhov zoo ntawm SPARSE kem yog: Qhov tsis zoo ntawm SPARSE kem yog: SPARSE kem tsis tuaj yeem siv rau ntawm cov ntawv, ntext, duab, timestamp, geometry, geography lossis cov neeg siv cov ntaub ntawv teev tseg
Dab tsi yog qhov qub txeeg qub teg Dab tsi yog qhov sib txawv ntawm qhov qub txeeg qub teg piav nrog piv txwv?
Inheritance yog ib txoj hauv kev kom tau txais cov yam ntxwv thiab kev coj cwj pwm ntawm ib chav kawm los ntawm lwm chav kawm. Cov chav kawm uas cov tswv cuab tau txais qub txeeg qub teg yog hu ua chav kawm hauv paus, thiab chav kawm uas tau txais cov tswv cuab tam sim no hu ua chav derived. Inheritance siv IS-A kev sib raug zoo
Dab tsi yog qhov zoo sib xws thiab qhov txawv ntawm relays thiab PLC yog dab tsi?
Relays yog electro-mechanical keyboards uas muaj coil thiab ob hom kev sib cuag uas tsis yog NO & NC. Tab sis Programmable Logic Controller, PLC yog lub khoos phis tawj me uas tuaj yeem txiav txim siab raws li qhov kev zov me nyuam thiab nws cov tswv yim & tso tawm
Dab tsi yog qhov sib txawv ntawm qhov ntsuas qhov ntsuas thiab qhov ntsuas thib ob?
Primary index: nyob rau hauv ib tug sequentially order file, qhov Performance index uas nws search key qhia cov sequential order ntawm cov ntaub ntawv. Kuj hu ua clustering index. Secondary index: ib qho Performance index uas nws qhov tseem ceeb tshawb nrhiav qhia qhov kev txiav txim sib txawv ntawm qhov kev txiav txim ntawm cov ntaub ntawv. Kuj hu ua non-clustering index