Aquest article us ensenyarà com fer un diccionari en JavaScript utilitzant objectes per emmagatzemar parells clau-valor. Tot i que JavaScript no té un tipus de diccionari integrat, podem crear-ne un de manera efectiva utilitzant objectes JavaScript. Comencem per crear un nou objecte JavaScript que actuï com el nostre diccionari.
Sintaxi:
La clau pot ser una cadena, un nombre enter. Si només escriviu key1 o qualsevol número, es tractarà com una cadena.
var dict = { key1 : value1 , key2 : value2 , .... };>- Crea un diccionari buit
var dict = {};> - Afegir parells clau-valor al diccionari
dict[new_key] = new_value;>
o Si new_key ja està present al diccionari, el valor d'aquesta s'actualitzarà a new_value.dict.new_key = new_value;>
- Accés a parells clau-valor
var value = dict[key];>
ovar value = dict.key;>
- Iterant tot el diccionari
for(var key in dict) { console.log(key + ' : ' + dict[key]); }>
Exemple:
HTML Diccionari en Javascripttitle> cap> <body style='text-align: center;'> <h1 style='color: green;'>techcodeview.com h1><p>var dict = { <br />'friki': 1, <br />'per' : '2', <br />'frikis': 3.5 <br />}; <br />p> <button onClick='fun()'>Botó Afegeix parells clau-valor nous><p id='demo'>p><script>function fun() { var dict = { geek: 1, per a: '2', geeks: 3.5, }; dict.new_geeks = 'nou_valor'; dict['another_new_geeks'] = 'un altre_valor'; var to_show = 'var dict = { '; for (clau var en dict) { to_show += ''' + clau + '' : ' + dict[clau] + ' '; } mostrar += ' }; '; document.getElementById('demo') .innerHTML = mostrar; } script> body> html>>></pre> </code> <p dir='ltr'> <b> <strong>Sortida:</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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