Correcting teacher:PHPz
Correction status:qualified
Teacher's comments:
const ul = document.createElement('ul');
document.body.append(ul);
const li = document.createElement('li');
li.append('new item');
li.style.color = 'red';
ul.insertAdjacentHTML('afterbegin' , '<li style=:"color:red">hello</li>');
ul.insertAdjacentHTML('beforeend' , '<li style=:"color:red">hello world</li>');
ul.insertAdjacentHTML('afterend' , '<h4>共计:9个</h4>');
ul.firstElementChild.remove();
//删掉第一行