Hur skapar man en ordbok och lägger till nyckel-värdepar dynamiskt?

Hur skapar man en ordbok och lägger till nyckel-värdepar dynamiskt?

Den här artikeln lär dig hur du skapar en ordbok i JavaScript genom att använda objekt för att lagra nyckel-värdepar. Även om JavaScript inte har en inbyggd ordbokstyp, kan vi effektivt skapa en med JavaScript-objekt. Låt oss börja med att skapa ett nytt JavaScript-objekt för att fungera som vår ordbok.

Syntax:

Nyckel kan vara en sträng , heltal. Om du bara skriver nyckel1 eller valfritt nummer kommer det att behandlas som en sträng.

var dict = { key1 : value1 , key2 : value2 , .... }; 
  • Skapa en tom ordbok
    var dict = {}; 
  • Lägga till nyckel-värdepar i ordbok
    dict[new_key] = new_value; 
    eller Om new_key redan finns i ordboken kommer värdet på denna att uppdateras till new_value.
    dict.new_key = new_value; 
  • Tillgång till nyckel-värdepar
    var value = dict[key]; 
    eller
    var value = dict.key; 
  • Itererar hela ordboken
    for(var key in dict) { console.log(key + ' : ' + dict[key]); } 

Exempel:

HTML
      Ordbok i Javascripttitle> head> <body style='text-align: center;'>  <h1 style='color: green;'>techcodeview.com h1> <p>var dict = { <br />'nörd': 1, <br />'för' : '2', <br />'nördar': 3.5 <br />}; <br />p> <button onClick='fun()'>Lägg till nya nyckel-värdepar-knapp> <p id='demo'>p> <script>function fun() { var dict = { nörd: 1, för: '2', nördar: 3.5, };  dict.new_geeks = 'nytt_värde';  dict['another_new_geeks'] = 'ett annat_värde';  var to_show = 'var dict = { ';  for (var nyckel i dict) { to_show += ''' + tangent + '' : ' + dict[tangent] + ' ';  } 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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