index.html
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>My JavaScript</title>
</head>
<body>
<ul>
<li class="target">Taro</li>
<li id="second">Jiro</li>
<li class="target">Saburo</li>
</ul>
<button>OK</button>
<script src="main.js"></script>
</body>
</html>main.js
'use strict';
{
document.querySelector('button').addEventListener('click', () => {
const liElement = document.createElement('li');
liElement.textContent = 'Hanako';
// document.querySelector('ul').appendChild(liElement);
// document.querySelector('ul').insertBefore(
// liElement,
// document.querySelector('#second')
// );
if (confirm('Sure?') === true) {
document.querySelector('#second').remove();
}
});
}