Video: Koj tuaj yeem qhia tau li cas yog tias ob yam khoom zoo sib xws?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Yog ob yam khoom muaj tib lub cev, lawv hu ua " zoo sib xws ." Thaum ob cov duab yog zoo sib xws , qhov sib piv ntawm qhov ntev ntawm lawv qhov sib thooj yog sib npaug. Rau txiav txim yog tias daim duab peb sab qhia yog zoo sib xws , sib piv lawv cov sib raug zoo sab.
Tsis tas li ntawd, ua li cas koj thiaj paub tias ob yam khoom sib npaug?
Yog tus ob yam khoom muaj qhov tseem ceeb, sib npaug () yuav rov qab muaj tseeb. Hauv qhov sib piv thib ob, sib npaug () xyuas kom pom seb cov dhau lawm khoom yog null, or yog nws tau ntaus raws li lwm chav kawm. Yog nws yog lwm chav kawm ces tus khoom tsis yog sib npaug . Thaum kawg, sib npaug () muab piv rau khoom ' teb.
thaum siv nrog cov khoom Dab tsi yog qhov sib npaug == tus neeg teb xov tooj sib piv tiag tiag? Cov vaj huam sib luag (==) yog siv rau piv ob qhov txiaj ntsig lossis kev nthuav qhia. Nws yog siv rau piv tus lej, cov hlua, Boolean qhov tseem ceeb, hloov pauv, khoom , arrays, lossis functions. Qhov tshwm sim yog TRUE yog tias cov kab lus yog sib npaug thiab FALSE txwv tsis pub.
Ua li no, koj piv cov khoom li cas?
== sib piv khoom cov ntaub ntawv siv, nws tshawb xyuas seb puas yog ob lub operands taw tes rau tib yam khoom (tsis sib npaug khoom , tib khoom ). Yog koj xav tau piv cov hlua (kom pom tias lawv muaj tib cov cim), koj yuav tsum tau piv cov hlua siv sib npaug.
Peb puas tuaj yeem sib piv cov khoom hauv JavaScript?
Muab piv cov khoom yog ib qho yooj yim, siv === los yog Yam khoom .is(). Cov haujlwm no rov qab muaj tseeb yog tias lawv muaj qhov siv tib yam thiab tsis tseeb yog tias lawv ua tsis yog. Ib zaug ntxiv, cia kuv ntxhov siab, nws yog sib piv cov ntaub ntawv rau cov khoom , tsis yog tus nqi ntawm cov khoom . Yog li, los ntawm Piv txwv 3, Yam khoom .is(obj1, obj2); yuav rov cuav.
Pom zoo:
Puas txhais tau tias yog kev sib raug zoo ntawm cov khoom ntawm ib yam khoom thiab lub peev xwm ntawm tus neeg sawv cev uas muab cov lus qhia rau kev siv cov khoom?
Kev them nyiaj yog kev sib raug zoo ntawm cov khoom ntawm ib yam khoom thiab lub peev xwm ntawm tus neeg sawv cev uas txiav txim siab seb qhov khoom siv tau li cas
Koj tuaj yeem qhia tau li cas yog tias lub zog hluav taws xob tsis zoo?
Tsis muaj txoj hauv kev kom paub tseeb tias koj tus tiv thaiv surge yog qhov phem, tab sis qee qhov tuaj nrog lub teeb ceeb toom uas qhia tias koj yuav tsum tau txais tus tiv thaiv surge tshiab. Txij li thaum lub surge protector txoj hauj lwm yog kom nqus tau ntxiv zog es tsis txhob dhau spikes ntawm tam sim no rau koj cov khoom siv hluav taws xob muaj nuj nqis, nws absorbs hluav taws xob puas thaum lub sij hawm
Koj tuaj yeem qhia tau li cas yog tias ib qho kev nthuav qhia yog polynomial?
Rau ib qho kev qhia los ua ib lub ntsiab lus polynomial, txhua qhov hloov pauv hauv cov lus qhia yuav tsum muaj tag nrho cov naj npawb powers (lossis lwm qhov ' nkag siab' lub zog ntawm 1, xws li hauv x1, uas ib txwm sau ua x). Ib tus lej dawb kuj tuaj yeem yog lo lus polynomial
Dab tsi yog qhov sib txawv tseem ceeb ntawm kev sib txuas lus tsis sib xws thiab kev sib txuas lus taw qhia?
1. Hauv kev sib txuas lus tsis muaj kev sib txuas lus tsis tas yuav tsim kev sib txuas ntawm qhov chaw (sender) thiab qhov chaw (receiver). Tab sis nyob rau hauv kev sib txuas-taw qhia kev sib txuas lus kev sib txuas lus yuav tsum tau tsim ua ntej hloov cov ntaub ntawv
Kuv yuav ua li cas thiaj paub yog tias cov khoom PC tau sib xws?
Yuav ua li cas kom paub tseeb tias tag nrho koj lub PC Cheebtsam yog sib xws Kos lub motherboard CPU socket thiab sib piv rau koj xaiv processor. Saib seb RAM lub motherboard txhawb nqa dab tsi (piv txwv li yog DDR4 2300MHz). Ib yam li lub rooj tsavxwm, saib seb RAM CPU tuaj yeem txhawb nqa dab tsi. Txawm hais tias los yog tsis yog lub motherboard yuav txhawb nqa GPU SLI teeb tsa