JavaScript classListでクラス属性を操作するゾ
Element.classList classListは配列のように扱えるDOMTokenListオブジェクト // HTML: <div id="main" class="c1 c2 c3"></div> const main = document.getElementById('main'); const classList = main.classList; console.log( classList ); // => DOMTokenList(3) ["c1", "c2", "c3", value: "c1 c2 c3"] Element.classList.lengthでDOMに付…
