Ako vytvoriť slovník a dynamicky pridávať páry kľúč – hodnota?
Tento článok vás naučí, ako vytvoriť slovník v JavaScripte pomocou objektov na ukladanie párov kľúč – hodnota. Hoci JavaScript nemá vstavaný typ slovníka, môžeme ho efektívne vytvoriť pomocou objektov JavaScriptu. Začnime vytvorením nového objektu JavaScript, ktorý bude slúžiť ako náš slovník.
Syntax:
Kľúčom môže byť reťazec , celé číslo. Ak napíšete len kľúč1 alebo akékoľvek číslo, bude sa to považovať za reťazec.
var dict = { key1 : value1 , key2 : value2 , .... }; - Vytvorte prázdny slovník
var dict = {}; - Pridanie párov kľúč-hodnota do slovníka
dict[new_key] = new_value;
alebo Ak sa nový_kľúč už v slovníku nachádza, jeho hodnota sa aktualizuje na nová_hodnota.dict.new_key = new_value;
- Prístup k párom kľúč – hodnota
var value = dict[key];
alebovar value = dict.key;
- Iterácia celého slovníka
for(var key in dict) { console.log(key + ' : ' + dict[key]); }
Príklad:
HTML Slovník v jazyku Javascripttitle> head> <body style='text-align: center;'> <h1 style='color: green;'>techcodeview.com h1> <p>var dict = { <br />'geek' : 1 , <br />'pre' : '2', <br />'geeks' : 3.5 <br />}; <br />p> <button onClick='fun()'>Tlačidlo Pridať nové páry kľúč-hodnota> <p id='demo'>p> <script>function fun() { var dict = { geek: 1, for: '2', geeks: 3.5, }; dict.new_geeks = 'nová_hodnota'; dict['another_new_geeks'] = 'iná_hodnota'; var to_show = 'var dict = { '; for (kľúč var v dict) { to_show += ''' + kľúč + '' : ' + dict[kláves] + ' '; } na_zobrazenie += ' }; '; document.getElementById('demo') .innerHTML = to_show; } skript> telo> html> </pre> </code> <p dir='ltr'> <b> <strong>Výkon: </strong> </b> </p> <img src='//techcodeview.com/img/javascript-misc/88/how-create-dictionary.webp' alt=''> <br>
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