console 命令行工具 X clear

console

const $ul = document.getElementsByTagName('ul');
console.log($ul); // object HTMLCollection

const $li = $ul.getElementsByTagName('li');

/* --------------- 无限循环
for (let i = 0; i < $li.length; ++i) {
  $ul.appendChild(document.createElement('li'));
}
console.log($li.length);
*/

const $li2 = $ul.querySelectorAll('li');
console.log($li2);

<body>
<ul>
    <li>aaa</li>
    <li>ddd</li>
    <li>ccc</li>
</ul>
</body>