사전을 생성하고 키-값 쌍을 동적으로 추가하는 방법은 무엇입니까?
이 기사에서는 객체를 사용하여 키-값 쌍을 저장함으로써 JavaScript에서 사전을 만드는 방법을 설명합니다. JavaScript에는 사전 유형이 내장되어 있지 않지만 JavaScript 개체를 사용하여 효과적으로 사전 유형을 만들 수 있습니다. 사전 역할을 할 새로운 JavaScript 객체를 생성하는 것부터 시작해 보겠습니다.
통사론:
키는 문자열, 정수일 수 있습니다. key1 또는 임의의 숫자를 쓰면 문자열로 처리됩니다.
var dict = { key1 : value1 , key2 : value2 , .... }; - 빈 사전 만들기
var dict = {}; - 사전에 키-값 쌍 추가
dict[new_key] = new_value;
또는 new_key가 사전에 이미 존재하는 경우 이 값은 new_value로 업데이트됩니다.dict.new_key = new_value;
- 키-값 쌍에 액세스
var value = dict[key];
또는var value = dict.key;
- 전체 사전 반복
for(var key in dict) { console.log(key + ' : ' + dict[key]); }
예:
HTML 자바스크립트 사전제목> 머리> <body style='text-align: center;'> <h1 style='color: green;'>techcodeview.com h1> <p>var 사전 = { <br />'괴짜' : 1 , <br />'대상': '2', <br />'괴짜': 3.5 <br />}; <br />피> <button onClick='fun()'>새 키-값 쌍 추가 버튼> <p id='demo'>피> <script>function fun() { var dict = { geek: 1, for: '2', geeks: 3.5, }; dict.new_geeks = 'new_value'; dict['another_new_geeks'] = 'another_value'; var to_show = 'var dict = { '; for (dict의 var 키) { to_show += ''' + key + '' : ' + dict[key] + ' '; } to_show += ' }; '; document.getElementById('demo') .innerHTML = to_show; } 스크립트> 본문> html> </pre> </code> <p dir='ltr'> <b> <strong>산출: </strong> </b> </p> <img src='//techcodeview.com/img/javascript-misc/88/how-create-dictionary.webp' alt=''> <br>
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