JavaScript: ntchito zitsanzo

Ngati nthawi yomweyo kuyenda pansi pa madzi mu malembedwe achidule ndi manenedwe a JavaScript magwiridwe, yosavuta malamulo zitsanzo kuthandiza mwamsanga kuphunzira mmene kusintha mphamvu ndi dzuwa la masamba.

JS - chinenero mapulogalamu "mkati" osatsegula. JavaScript ali agwira ntchito ndi zinthu tsamba, njira pachiyambi mmunda wa chinthu wokonda mapulogalamu, "ndi wokhoza" kulankhulana ndi makina, chifukwa ambiri a JavaScript zitsanzo kachidindo si yomweyo zilipo kumvetsetsa ndi kugwiritsa ntchito.

General kudzera lamtseri: yosavuta kuyamba

Mapulogalamu osatsegula akadali mwana, koma mofulumira anapeza apamwamba ndi zinachitikira pachiyambi. The malembedwe ndi manenedwe a JavaScript analandira kuchokera lotchedwa "makolo" ndipo mu gawo magwiridwe ndi othandiza malembedwe - kuyambira chisanadze Intaneti mapulogalamu zinenero, makamaka C / C ++, Pascal.

Kusakatula ndi JavaScript zitsanzo, safuna kuti yomweyo kumvetsa mfundo ya malingaliro a olemba ndi magwiridwe a ma aligorivimu ndi - ntchito imeneyi unpromising, ndi bwino kuganizira mchitidwe anu payekha.

Mwachidule kuyamba ndi kugwirizana onload wothandizira pa chidutswa cha thupi ndi kulemba chikhalidwe "Hello" mu kalembedwe zamakono "I`m wokonzeka".

Zimenezi zikusonyeza mu JavaScript:

• mwambo onload, zimachitika pambuyo tsamba katundu akapatsidwa ndi wothandizira - GoPage () ntchito;
• ndi akatundu tsamba, ndi kasamalidwe ntchito amalandira GoPage ();
• ndi intakomu tcheru ntchito ya chinenero, amene amasonyeza uthenga mu osatsegula "Ndine wokonzeka";
• Browser mlendo amafuna anachita.

ndemanga anafotokoza zimene kuti zambiri ziyenera kuchitika pambuyo kukopera tsamba ndi kuyamba powerengetsera.

yabwino kwambiri: JS chimakhudzana kwambiri zogwirizana zinthu page. Choncho, document.getElementById kuitana amatipatsa ulalo div ndi "scTimer" dzina. Ntchito yomanga dTimer.innerHTML = "chilichonse chodalirika HTML kachidindo", mukhoza pompopompo kusintha nkhani za div lapansi.

Iwo ayenera makamaka kulabadira cholakwa mu thupi la undesirability za zolembedwa mu JavaScript. Zitsanzo za izi chifukwa kukumana ndi mavuto. Ndondomekozi pamwamba mwachindunji tcheru ( 'Ine ndine okonzeka'), ndipo ntchito izo siziri kutero. Kusonyeza mtundu uliwonse mizere analola apostrophes: osakwatira ndi iwiri, mmene mkati awiri mtundu wina akhoza kugwiritsidwa ntchito yekha, ena - chizindikiro chabe.

Pankhaniyi akanayenera ananenera, kapena tcheru ( "Ine ndine okonzeka '), maso (' I`m okonzeka '), maso (' I \ 'M okonzeka'), kapena ma.

Cholakwika mu JS-kachidindo

Poyamba anali osatsegula, pa kuyamba kwa mlendo iye yodzaza tsamba malo, anamanga ufumu mtengo ndiponso kuti JavaScript ntchito: kumupatsa mwayi kudziwa tsamba yodzaza, initialize zanyengo, handlers chochitika, ndi kulumikiza kulankhula ndi makina.

Kusanthula JavaScript (zitsanzo), m'pofunika kulabadira debugging code. njirayi chikupitiriza imagwera pa mapulogalamu a. Osatsegula imene amagwira ntchitoyo, mwina akamufunsirire amenewa kapena zida debugging, koma chitsanzo chosonyeza kuti mosamalitsa ndondomeko ya malembedwe chinenero, omasuka ndi lolondola aligorivimu ali ndi zotsatira kwambiri pa kukwaniritsa zotsatira opaleshoni.