javascript <button>非表示へ</button> <div id="next">これが消えます<div>function hideNext(e){ var nextElement = e.nextElementSibling; if (nextElement.style.display !== 'none') { nextElement.style.display = 'none'; e.innerHTML = ' 表示 '; } else { nextElement.style.display = 'b</div></div>…