Hvordan opretter man en ordbog og tilføjer nøgleværdipar dynamisk?

Hvordan opretter man en ordbog og tilføjer nøgleværdipar dynamisk?

Denne artikel vil lære dig, hvordan du laver en ordbog i JavaScript ved at bruge objekter til at gemme nøgleværdi-par. Selvom JavaScript ikke har en indbygget ordbogstype, kan vi effektivt oprette en ved hjælp af JavaScript-objekter. Lad os starte med at oprette et nyt JavaScript-objekt, der fungerer som vores ordbog.

Syntaks:

Nøglen kan være en streng , heltal. Hvis du bare skriver nøgle1 eller et hvilket som helst tal, behandles det som en streng.

var dict = { key1 : value1 , key2 : value2 , .... }; 
  • Opret tom ordbog
    var dict = {}; 
  • Tilføjelse af nøgle-værdi-par i ordbog
    dict[new_key] = new_value; 
    eller Hvis new_key allerede er til stede i ordbogen, vil værdien af ​​denne blive opdateret til new_value.
    dict.new_key = new_value; 
  • Adgang til nøgle-værdi-par
    var value = dict[key]; 
    eller
    var value = dict.key; 
  • Gentager hele ordbogen
    for(var key in dict) { console.log(key + ' : ' + dict[key]); } 

Eksempel:

HTML
      Ordbog i Javascripttitle> head> <body style='text-align: center;'>  <h1 style='color: green;'>techcodeview.com h1> <p>var dict = { <br />'nørd': 1, <br />'for' : '2', <br />'nørder': 3.5 <br />}; <br />p> <button onClick='fun()'>Tilføj ny nøgle-værdi-par knap> <p id='demo'>p> <script>function fun() { var dict = { nørd: 1, for: '2', nørder: 3.5, };  dict.new_geeks = 'ny_værdi';  dict['another_new_geeks'] = 'anden_værdi';  var to_show = 'var dict = { ';  for (var nøgle 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>Produktion: </strong>  </b>  </p>  <img src='//techcodeview.com/img/javascript-misc/88/how-create-dictionary.webp' alt=''>  <br>
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