Denne artikkelen vil lære deg hvordan du lager en ordbok i JavaScript ved å bruke objekter til å lagre nøkkelverdi-par. Selv om JavaScript ikke har en innebygd ordboktype, kan vi effektivt lage en ved å bruke JavaScript-objekter. La oss starte med å lage et nytt JavaScript-objekt som fungerer som vår ordbok.
hvordan kjøre et skript i linux
Syntaks:
Nøkkel kan være en streng , heltall. Hvis du bare skriver nøkkel1 eller et hvilket som helst tall, vil det behandles som en streng.
var dict = { key1 : value1 , key2 : value2 , .... };>- Lag tom ordbok
var dict = {};> - Legge til nøkkel-verdi-par i ordbok
dict[new_key] = new_value;>
eller Hvis ny_nøkkel allerede finnes i ordboken, vil verdien av denne oppdateres til ny_verdi.dict.new_key = new_value;>
- Tilgang til nøkkel-verdi-par
var value = dict[key];>
ellervar value = dict.key;>
- Itererer hele ordboken
for(var key in dict) { console.log(key + ' : ' + dict[key]); }>
Eksempel:
HTML Ordbok i Javascripttitle> head> <body style='text-align: center;'> <h1 style='color: green;'>techcodeview.com h1><p>var dict = { <br />'geek': 1, <br />'for' : '2', <br />'nerder': 3.5 <br />}; <br />p> <button onClick='fun()'>Legg til ny nøkkel-verdi-par-knapp><p id='demo'>p><script>function fun() { var dict = { geek: 1, for: '2', geeks: 3.5, }; dict.new_geeks = 'ny_verdi'; dict['another_new_geeks'] = 'en annen_verdi'; var to_show = 'var dict = { '; for (var nøkkel i dict) { to_show += ''' + tast + '' : ' + dict[tast] + ' '; } to_show += ' }; '; document.getElementById('demo') .innerHTML = to_show; } script> body> html>></pre> </code> <p dir='ltr'> <b> <strong>Produksjon:</strong> </b> </p> <img src='//techcodeview.com/img/javascript-misc/88/how-create-dictionary.webp' alt=""> <br></article><div class="rekl_placeholder"><script type="text/javascript">atOptions = {'key' : 'f2b09f3e7178b263531e10998e9a32fa','format' : 'iframe','height' : 250,'width' : 300,'params' : {}};</script><script type="text/javascript" src="//spiritscaution.com/f2b09f3e7178b263531e10998e9a32fa/invoke.js"></script></div> </article>
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