辞書を作成し、キーと値のペアを動的に追加するにはどうすればよいですか?
この記事では、オブジェクトを使用してキーと値のペアを格納することにより、JavaScript で辞書を作成する方法を説明します。 JavaScript には組み込みの辞書タイプがありませんが、JavaScript オブジェクトを使用して効果的に辞書タイプを作成できます。まず、辞書として機能する新しい JavaScript オブジェクトを作成しましょう。
構文：
キーには文字列または整数を指定できます。 key1 または任意の数字を記述するだけでは、文字列として扱われます。
var dict = { key1 : value1 , key2 : value2 , .... }; - 空の辞書を作成する
var dict = {}; - ディクショナリへのキーと値のペアの追加
dict[new_key] = new_value;
または new_key がすでに辞書に存在する場合、この値は new_value に更新されます。dict.new_key = new_value;
- キーと値のペアへのアクセス
var value = dict[key];
またはvar value = dict.key;
- 辞書全体を反復する
for(var key in dict) { console.log(key + ' : ' + dict[key]); }
例：
HTML Javascript の辞書title> head> <body style='text-align: center;'> <h1 style='color: green;'>techcodeview.com h1> <p>var dict = { <br />「オタク」 : 1 、 <br />'for' : '2', <br />「オタク」 : 3.5 <br />}; <br />p> <button onClick='fun()'>新しいキーと値のペアを追加ボタン> <p id='demo'>p> <script>function fun() { var dict = { オタク: 1, for: '2', オタク: 3.5, }; dict.new_geeks = 'new_value'; dict['another_new_geeks'] = 'another_value'; var to_show = 'var dict = { '; for (var key in dict) { to_show += ''' + key + '' : ' + dict[key] + ' '; to_show += ' }; '; document.getElementById('demo') .innerHTML = to_show; } スクリプト>本体>html>> </pre> </code> <p dir='ltr'> <b> <strong>出力： </strong> </b> </p> <img src='//techcodeview.com/img/javascript-misc/88/how-create-dictionary.webp' alt=''> <br>
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