5 Amaphutha amaningi ajwayelekile enziwe ngonjiniyela beJavaScript

Ukuthuthukiswa kweJavascript

IJavaScript wulimi oluyisisekelo cishe kuzo zonke izinhlelo zanamuhla zewebhu. Eminyakeni embalwa edlule, sibonile ukwanda kwenani eliphelele lemitapo yolwazi enamandla kakhulu esekwe kwiJavaScript ekwakheni izinhlelo zokusebenza zewebhu. Lokhu kusebenzele Izicelo Zekhasi Elilodwa kanye namapulatifomu ohlangothini lwe-JavaScript. IJavaScript isivele yaba khona yonke indawo emhlabeni wokuthuthuka kwewebhu. Kungakho ifayili le- ikhono elikhulu okufanele lilawulwe ngabathuthukisi bewebhu.

IJavaScript ingahle ibukeke ilula ekubukeni kokuqala. Yize ukwakha ukusebenza okuyisisekelo kweJavaScript kuyinqubo elula futhi eqondile yanoma ngubani, noma ngabe umuntu emusha ngokuphelele kwiJavaScript. Kepha ulimi lusalukhuni futhi lunamandla kakhulu kunalokho ebesingathanda ukukukholelwa. Ungafunda izinto eziningi ezifundweni zeJavaScript ngo- I-ECMAScript 2015. Lokhu kusiza ekubhaleni ikhodi emnandi futhi kubuye kubhekwane nezinkinga zamafa. Lezi zinto ezilula zingaholela ezindabeni eziyinkimbinkimbi kwesinye isikhathi. Ake sixoxe ngezinye zezinkinga ezivame kakhulu.

  1. Ububanzi bezinga le-block - Enye yezinto ezivame kakhulu ukungaqondani phakathi konjiniyela beJavaScript ukucabanga ukuthi kunikela ngesilinganiso esisha sebhulokhi ngayinye yekhodi. Lokhu kungaba iqiniso kwezinye izilimi eziningana, kepha kungenjalo ngokuphelele ngeJavaScript. Yize izikali ezingeni le-block zithola ukusekelwa okuqhubekayo ngendlela yamagama angukhiye amasha azosebenzisa amagama asemqoka ku-ECMAScript 6.
  2. Ukuvuza Kwememori - Uma unganakile ngokwanele, ukuvuza kwenkumbulo kuyinto engenakugwenywa ngenkathi ufaka ikhodi kuJavaScript. Kunezindlela eziningi lapho ukuvuza kwememori kungenzeka khona. Ukuvuza kwenkumbulo okukodwa kwenzeka lapho unezikhombo ezikhululekile zezinto ezingasebenzi. Ukuvuza kwenkumbulo yesibili kuzokwenzeka lapho kunereferensi eyindilinga. Kepha kunezindlela zokugwema lokhu kuvuza kwenkumbulo. Okuguqukayo Komhlaba kanye nezinto ezisesitaki samanje sezingcingo zaziwa njengezimpande futhi ziyatholakala. Zigcinwa kwimemori inqobo nje uma zingatholwa kalula kusuka ezimpandeni kusetshenziswa ireferensi.
  3. Ukuphathwa kwe-DOM - Ungakhohlisa kalula i-DOM kuJavaScript, kepha ayikho indlela lokhu okungenziwa ngayo kahle. Ukungezwa kwento ye-DOM ukuyikhodi inqubo ebizayo. Ikhodi esetshenziselwa ukwengeza ama-DOM amaningi ayisebenzi kahle ngokwanele ngakho-ke ngeke isebenze kahle. Yilapho ungasebenzisa izingcezu zemibhalo ezingasiza ekwenzeni ngcono ukusebenza kahle nokusebenza.
  4. Kuyabhekiswa - Amasu wokufaka amakhodi namaphethini wokuklama weJavaScript asethuthukile eminyakeni embalwa edlule. Lokhu kuholele ekwandeni kokukhula kwezikhawu zokuzichaza. Lezi zikalo ziyimbangela ejwayelekile yokudideka ye- lokhu / lokho. Isixazululo esihambisanayo sale nkinga ukusindisa ireferensi yakho njenge lokhu ngokuguquguqukayo.
  5. Imodi Eqinile - Imodi Eqinile kuyinqubo lapho ukuphatha iphutha ngesikhathi sakho sokusebenza seJavaScript kwenziwa kwaqina futhi lokhu kukwenza kuphephe kakhudlwana. Ukusetshenziswa kweModi Eqinile kuye kwamukelwa kabanzi futhi kwenziwa kwaziwa. Ukushiywa kwalo kubhekwa njengephuzu elibi. Izinzuzo ezinkulu zemodi eqinile kulula ukulungisa amaphutha, izimbulunga zengozi zivinjelwe, amagama ezakhiwo eziyimpinda ayenqatshwa njll.
  6. Izinkinga ze-Subclass - Ukuze wakhe isigaba sibe yisigaba esingaphansi kwesinye isigaba, kuzodingeka ukuthi usebenzise i- iyaqhubeka igama elingukhiye. Kuzofanele usebenzise kuqala kuhle (), uma kwenzeka kusetshenziswe indlela yomakhi ku-subclass. Lokhu kuzokwenziwa ngaphambi kokusebenzisa lokhu igama elingukhiye. Uma lokhu kungenziwanga, ikhodi ngeke isebenze. Uma uqhubeka uvumela amakilasi weJavaScript ukuthi enwebe izinto ezijwayelekile, uzoqhubeka nokuthola amaphutha.

Qedani

Endabeni yeJavaScript futhi ngokufanayo nanoma yiluphi olunye ulimi, lapho uzama ukuqonda ukuthi isebenza kanjani nokuthi ayisebenzi kanjani, kuzoba lula kuwe ukuthi wakhe ikhodi eqinile. Lokhu kuzokuvumela ukuthi ulusebenzise kahle ulimi. Ukuntuleka kokuqonda okufanele lapho inkinga iqala khona. Izigaba ze-ES6 zeJavaScript zikunikeza ngamathiphu wokwenza ikhodi egxile entweni.

Uma ungakuqondi kahle ukuguquka okuncane nokujika kwekhodi, uzogcina nezimbungulu kuhlelo lwakho lokusebenza. Uma unokungabaza, ungaxhumana nabanye onjiniyela bewebhu abagcwele isitaki.

UCABANGANI?

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