Jak utworzyć słownik i dynamicznie dodawać pary klucz-wartość?
W tym artykule dowiesz się, jak utworzyć słownik w JavaScript, używając obiektów do przechowywania par klucz-wartość. Chociaż JavaScript nie ma wbudowanego typu słownika, możemy go skutecznie utworzyć za pomocą obiektów JavaScript. Zacznijmy od utworzenia nowego obiektu JavaScript, który będzie pełnił rolę naszego słownika.
Składnia:
Klucz może być ciągiem znaków lub liczbą całkowitą. Jeśli po prostu napiszesz klucz1 lub dowolną liczbę, zostanie on potraktowany jako ciąg znaków.
var dict = { key1 : value1 , key2 : value2 , .... }; - Utwórz pusty słownik
var dict = {}; - Dodawanie par klucz-wartość w słowniku
dict[new_key] = new_value;
lub Jeśli nowy_klucz jest już obecny w słowniku, jego wartość zostanie zaktualizowana do nowej_wartości.dict.new_key = new_value;
- Dostęp do par klucz-wartość
var value = dict[key];
Lubvar value = dict.key;
- Iterowanie całego słownika
for(var key in dict) { console.log(key + ' : ' + dict[key]); }
Przykład:
HTML Słownik w JavaScripttytuł>głowa> <body style='text-align: center;'> <h1 style='color: green;'>techcodeview.com h1> <p>var dykt = { <br />'geek' : 1 , <br />'dla 2', <br />'geekowie' : 3.5 <br />}; <br />p> <button onClick='fun()'>Dodaj nowy przycisk par klucz-wartość> <p id='demo'>p> <script>funkcja zabawa() { var dict = { maniak: 1, for: '2', maniak: 3.5, }; dict.new_geeks = 'nowa_wartość'; dict['another_new_geeks'] = 'inna_wartość'; var to_show = 'var dict = { '; for (var klucz w dyktacie) { to_show += ''' + klucz + '' : ' + dykt[klawisz] + ' '; } to_show += ' }; '; document.getElementById('demo') .innerHTML = to_show; } skrypt> treść> html> </pre> </code> <p dir='ltr'> <b> <strong>Wyjście: </strong> </b> </p> <img src='//techcodeview.com/img/javascript-misc/88/how-create-dictionary.webp' alt=''> <br>
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