<button id="btn">呼び出す</button>
<div id="stage"></div>
const btn = document.querySelector('#btn');
const stage = document.querySelector('#stage');
btn.addEventListener('click', function() {
for (let i = 0; i < 10; i++) {
const star = document.createElement('p');
star.textContent = '==';
stage.appendChild(star);
}
});