JavaScript zvishwe nokuti, apo, ita-apo

Nhoroondo paumbwe ano zvirongwa mutauro nemarongerwo zvakafanana nedanho zivo muchadenga. Uye kuti akanga ari kutanga ... asi ikozvino zvose zviri nyore oornag.

The algorithm pakupedzisira - nguva dzose ane the daisy ngetani mirayiro. Parallelism mu mapurogiramu - kuisa kamwe chete sequences zvabatanidzwa. Round Robin akanga asina anoshanda Serial kana kufanana murayiro cheni. Labels, kuchinja, uye mamiriro - chete zvokuti chero mhinduro. mitauro Functional kunge dziine kukosha pfungwa idzi, asi kudiwa kudzokorora zvikamu romutemo akasara.

Browser: Dom, rurimi rwake + Server

JavaScript-zvinogara zviripo, kunyange zvazvo pfungwa dzichipfekeka vakatodzidza anokosha. Zvichida chinhu zvakasara "chirimi" uye "Tsamba", asi kupfuura zvose, nzvimbo apo JavaScript mupenyu, kwakaita kuti chokwadi kuti hakuna, asi zviri chokwadi kuti ichi ichangoburwa chisarudzo.

JavaScript anomhanya mukati Browser kuti anopiwa peji, parses ndokuita Dom uye paanounza manyorero wokutanga. mamwe mapeji All, kusanganisira paIndaneti pamusoro ichi - ndiwo yokuvaka maoko kutyora mutauro naro bumbiro riri server kuti migumisiro uchishandisa AJAX mashandiro kunogona naro.

The Browser anoita kuwana JavaScript-bumbiro kuti anogona kushandisa vanovengwa Browser, kusanganisira mumwe transmits umboo kuti server vawane mhinduro, sezvo zvinogona kuita somunhu HTML-markup uye zvitaera uye chaidzo romutemo. Mhinduro inogona kumiririrwa arrays uye zvinhu. Sense kushandisa JavaScript akarasika zvinogara, mikana zvakawanzwa kuita pasina kwavari, uye yokuzogumbura kuti Browser yokuturika isingaperi kutevedzana mirayiro haisi nzira yakanakisisa.

Chaizvoizvo zvishwe varipo vari vakawanda JavaScript nemarongerwo, Developers kungaita mureza magadzirirwo yavo mabasa.

JavaScript Bumbiro nezvenzvimbo muchadenga

Modern programmer haritombotauri kufunga kuti akashandisa kutenderera (nokuti, The apo, ita The apo, ...) - pakupedzisira nhevedzano zvinogara (zvinogara) processor, iri nyore kutevedzana kwezviitiko binary kushandiswa, hwakakanganiswa Checkout counter, kureva mamiriro.

Zvazvakadaro, ichitanga haisi pachiyero muchina mutauro: kunosanganisira zvatinosiita mirayiro, zvimiso kushandiswa uye kutendeuka. Level kumusoro, hazvinei zvinoreva chii kungashandiswa kukura Browser uye JavaScript Interpreter, zvinogara vachava akasiyana nemamwe. Uye "zvidimbu bumbiro" zvichakurukurwa munyaya dzakasiyana uye zvizvarwa akasiyana programmers. Uriri kumusoro ari "kuvaka» JavaScript. The nemarongerwo iyo inopa ano JavaScript zvinogara.

JS - mutauro wakanaka: hunobatsira, ano uye renguva kuripo. The nemarongerwo chiridzwa ichi zvinosanganisira constructs zvose kuti vakapfuura pakuongororwa nguva uye kuva hwaro upi algorithm kuchinjika. Asi nekuti zvinogara kana zvakakodzera, zvechokwadi? Mberi mapurogiramu kazhinji ndakazvibvunza mibvunzo inokosha hunhu, asi chete mune zvimwe zviitiko, kuwana mhinduro.

vavariro chikonzero

The kutenderera kungava maviri chete dzakasiyana ezvinhu kana kuti pakaunda, asi chaizvoizvo (panguva yakaderera pamwero) chero kutenderera - chete pfungwa. Mune mimwe mitauro zvakafanana kutenderera "nerimwe." In JavaScript zvinogara foreach mamiriro aimiririra Prop ari chinhu, asi zvinoita kushandisa musiyano wezvinyorwa array.forEach (...).

Chero zvazvingava, kusarudza vaviri muchina bumbiro kuti anoita pamagumo zvose zvirongwa algorithms, kunyange achinyorera kuturikira mitauro, haana mumwe murayiro cheni achidzokorora kuita: ave chinhu kuita zvakare kusvikira:

• kaunda Counts;
• kusvikira mamiriro ezvinhu akasangana.

JavaScript - randinenge muturikiri. Its nevamwe chinhu: nayo anoshanda mukati Browser rinoshandisa zvayo zvinhu uye anobvumira kuti aite algorithms uri yeGmail.END_STRONG divi sezvo peji mitoro iri mubrowser, uye mukufamba basa rayo.

Simple kutenderera neimwe

Musi JavaScript foreach muzvishwe Dzakafanana kushandiswa siyana mashandiro:

Kushandiswa zvinogara zvakadaro havana kukonzera matambudziko. Pamutemo, hapana chaiko kutenderera. Pane inopindirana kurapwa basa kuti zvinhu siyana.

Kutenderera pamusoro yemabhuku

More vakajaira kutarisa JavaScript zvinogara pamusoro:

Pano, pakaunda anoita shanduka ane ukoshi kunoenderana nzira uye chiratidzo ndiko kuguma kutenderera ezvinhu. Kwete hazvo kuti nzira uye mamiriro unosanganisira shanduka kutenderera. Asi kudzora kuguma pfungwa iri kutenderera kunotemwa yavo kugutsikana zvachose.

ndokunge zvishwe

Option pamwe apo JavaScript inopa, zvichienderana kana uchifanira kuongorora mamiriro. Kana muviri loop arege kuurayiwa kunyange kamwe - uyu, kana muviri anofanira kuitwa kanenge kamwe, ndiko poruponeso

Muchiitiko chokutanga, nokududzira magadzirirwo apo, JavaScript kutanga achaongorora mamiriro, uye kana chiri chokwadi, nokundiruramisira ari loop. Kana wechipiri kutenderera achatanga aurayiwe. Kana Pamusana variables raanotaura yakapiwa zvakagadzirwa kuita apo, zvichatora kutora venhema kukosha, ari loop rinomira.

Wandisa mubatanidzwa nyore algorithms

The chikuru basa (chinokosha) ipi algorithm - kuwana, uye chete osarudza pamusoro zvokuita inotevera. Chinonyanya chinyakare kutsvaka nzira - kukumbira imwe shanduka, zvinoguma pakarepo. Kana variables vazhinji, uye ane tsika dzakawanda (kuko), zvino mharidzo tsika vanofanira kuwanikwa kuti achasarudza yemberi maitiro ari manyorero.

Dzidziso iyi nyore akaita loop aine pakaunda muna JavaScript mutauro mushonga mhando matambudziko ose. Modern makombiyuta siyana nokukurumidza. Nguva yokuuraya mumanyoro ari mubrowser yakakwana, hapana mhanya. Zviri nyore kugadzirisa chinhu chinhu. Somugumisiro, J avaScript nokuti zvishwe vava dzakakurumbira chaizvo.

Chakakanganisika chinhu mhando iyi. Asi shure nzira iri nyore kurasikirwa musimboti iro rakanyorwa chimwe algorithm. Ava havana maturo. Zvose izvo zvakanyorwa, chero chirongwa kuti musoro. Richinyanya pana J avaScript zvinogara zvichitarisirwa, yokuvaka havagoni kuona musimboti kurudyi uye kwete kusika mukana wakakwana algorithm.

Functionality, mumwe kumiririrwa chaicho

однотипного кода можно представить функциями - алгоритм сразу преобразится, основное тело скрипта уменьшится в размере, все станет читаемым и понятным. Muchishandisa JavaScript-zvinogara, mienzaniso kwakadaro remitemo anogona kumirira Unoshanda - the algorithm kamwe kushandurwa, chikuru mutumbi manyorero aiitwa maduku, zvose zvichava verengeka uye unonzwisisika.

Izvi haisi idzva mhinduro, asi chaizvoizvo hazvisi chisingakwanisi kutsanangurwa mamwe mutauro constructs. Zvikurukuru, J avaScript zvinogara anogona kuwanikwa dzekare paradzanisa () shanda:

cResult = '9,8,7,6,5,4' ; hadde cResult = '9,8,7,6,5,4';
aResult = cResult . hadde aResult = cResult. ( ',' ); paradzanisa ( ',');

Hakuna kutenderera, asi zvimwe akaita basa iri, kana kwete nokutsvaka chiratidzo '' uye kurishandisa kupatsanura nhamba umwe neumwe.

Abstracting kubva sei chinozoiswa mukati paradzanisa () basa inogona vaisanganisa wayo JavaScript functionality kushandisa chinogaroitwa tichitarisa nemashandisiro - yamunenge. Zvinokosha kuti kwakadaro nzira inotungamirira kukura functionality rimwe basa, ukuwo, asi nhamba vachiri kusvika ichi.

Mabasa aya allt (), padc (), padl () uye padr () - chii hakuwaniki muna JavaScript, asi dzimwe nguva zvakakodzera kubvisa kubva tambo kana dzezvimwe kuti vaenzanise nokureba tambo kuruboshwe, kurudyi kana mativi. The muviri mitambo iyi - JavaScript-zvinogara. Simple, svikika uye usambofa zvakabatira algorithm kuti anorishandisa.

Embodiments nhamba kutendeuka mashandiro anoita 16-Ary 10-fung kukarukureta uye shure nehurongwa, zviri nyore kuudza mashoko kubva pamanyorerwo mumwe, aumba pano noruoko Itai apo zvinogara. Very chiine akarongeka nemarongerwo.

Correct zvinogara - kumiririrwa chokwadi

JavaScript - kwete kufanana navamwe zvirongwa mitauro uye yakasiyana-siyana shanduro uye Chikurukuru, zvinowanzoita haana kushandura nemarongerwo, uye kutanga uye kuikudziridza.

Programmer kufunga kushandisa JS, zvakasiyana PHP programmer mafungiro (zvikurukuru, uye mimwe mitauro yose, zvakanaka, asi kuti "Tsamba" uye vateveri vake vari haana kuiswawo pakati vakawanda mirayiridzo), kana kuti algorithm haringorevi variables, arrays, basa dzaishandisa, cyclic nhengo .

Kana isu kufungidzira kuti hapana Zvinonzi, uye kugadzirisa dambudziko zvakakodzera, nyore sarudzo (chivharo chekumeso) - anoratidza kuti purogiramu yacho processing data, zvinova pfungwa kana pfungwa wemuTesitamende mashoko nzvimbo. Chii chiri kurehwa uye chii pfungwa maitiro - ndiwo penyaya nzvimbo. Nokuti programmer, chinyorwa ichi zvinoreva: nyore, iri iine nyore mashoko. Sezvingatarisirwa, izvi nyore imwe pamwero mumwe pamwero pazasi hurongwa ichava, asi nokuda LEVEL - pfungwa.

With nzira iyi, pfungwa care - kuratidza zivikanwo yavo kuburikidza nzira dzavo. Kana pfungwa iri super-yezvinhu, mashandiro ezvinhu - kuratidza ayo chaizvo sezvo mubatanidzwa masangano kuva kwake points.

Izvi ndizvo rekare pfungwa mapurogiramu mitauro, asi harisati kuwanikwa zvakakwana kuratidzwa kwayo mune zvirongwa. programmers Vakawanda vanofunga zvakarurama, asi mugumisiro basa ravo kunosiya zvakawanda anodikamwa.

Zvinobatsira dzimwe nguva kupfeka bhandeji pamusoro maziso ake kuti aone nyika!