Jak vytvořit slovník a dynamicky přidávat páry klíč–hodnota?
Tento článek vás naučí, jak vytvořit slovník v JavaScriptu pomocí objektů k ukládání párů klíč–hodnota. Přestože JavaScript nemá vestavěný typ slovníku, můžeme jej efektivně vytvořit pomocí objektů JavaScriptu. Začněme vytvořením nového objektu JavaScript, který bude fungovat jako náš slovník.
Syntax:
Klíčem může být řetězec , celé číslo. Pokud napíšete pouze klíč1 nebo jakékoli číslo, bude to považováno za řetězec.
var dict = { key1 : value1 , key2 : value2 , .... }; - Vytvořte prázdný slovník
var dict = {}; - Přidání párů klíč-hodnota do slovníku
dict[new_key] = new_value;
nebo Pokud je nový_klíč již ve slovníku přítomen, bude jeho hodnota aktualizována na nová_hodnota.dict.new_key = new_value;
- Přístup k párům klíč-hodnota
var value = dict[key];
nebovar value = dict.key;
- Iterace celého slovníku
for(var key in dict) { console.log(key + ' : ' + dict[key]); }
Příklad:
HTML Slovník v jazyce Javascripttitle> head> <body style='text-align: center;'> <h1 style='color: green;'>techcodeview.com h1> <p>var dict = { <br />'geek' : 1, <br />'pro' : '2', <br />'geekové' : 3.5 <br />}; <br />p> <button onClick='fun()'>Tlačítko Přidat nové páry klíč-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'] = 'jiná_hodnota'; var to_show = 'var dict = { '; for (klíč var v diktátu) { to_show += ''' + klíč + '' : ' + dict[klíč] + ' '; } to_show += ' }; '; document.getElementById('demo') .innerHTML = to_show; } skript> tělo> html> </pre> </code> <p dir='ltr'> <b> <strong>Výstup: </strong> </b> </p> <img src='//techcodeview.com/img/javascript-misc/88/how-create-dictionary.webp' alt=''> <br>
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