Miten luodaan sanakirjaa ja lisätään avain-arvo-pareja dynaamisesti?
Tämä artikkeli opettaa sinulle, kuinka voit tehdä sanakirjan JavaScriptissä käyttämällä objekteja avainarvo-parien tallentamiseen. Vaikka JavaScriptillä ei ole sisäänrakennettua sanakirjatyyppiä, voimme luoda sellaisen tehokkaasti JavaScript-objektien avulla. Aloitetaan luomalla uusi JavaScript-objekti, joka toimii sanakirjanamme.
Syntaksi:
Avain voi olla merkkijono , kokonaisluku. Jos kirjoitat vain avain1 tai minkä tahansa numeron, sitä käsitellään merkkijonona.
var dict = { key1 : value1 , key2 : value2 , .... }; - Luo tyhjä sanakirja
var dict = {}; - Avainarvo-parien lisääminen sanakirjaan
dict[new_key] = new_value;
tai Jos uusi_avain on jo olemassa sanakirjassa, tämän arvoksi päivitetään uusi_arvo.dict.new_key = new_value;
- Avain-arvo-parien käyttäminen
var value = dict[key];
taivar value = dict.key;
- Iteroidaan koko sanakirja
for(var key in dict) { console.log(key + ' : ' + dict[key]); }
Esimerkki:
HTML Sanakirja Javascripttitle> head> <body style='text-align: center;'> <h1 style='color: green;'>techcodeview.com h1> <p>var dict = { <br />'nörtti': 1, <br />'for' : '2', <br />'nörttiä' : 3.5 <br />}; <br />p> <button onClick='fun()'>Lisää uusia avainarvopareja -painike> <p id='demo'>p> <script>function fun() { var dict = { pelle: 1, for: '2', geeks: 3.5, }; dict.new_geeks = 'uusi_arvo'; dict['another_new_geeks'] = 'toinen_arvo'; var to_show = 'var dict = { '; for (var key in dict) { to_show += ''' + avain + '' : ' + dict[avain] + ' '; } to_show += ' }; '; document.getElementById('demo') .innerHTML = näytettävä; } script> body> html> </pre> </code> <p dir='ltr'> <b> <strong>Lähtö: </strong> </b> </p> <img src='//techcodeview.com/img/javascript-misc/88/how-create-dictionary.webp' alt=''> <br>
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