lt;div class="fuClass"><h4 id="Title">jiajia</h4></div>

//創(chuàng)建新的元素

const newTitle=document.createElement('h1');

//添加id

newTitle.id="newTitle";

//內容

// newTitle.innerText="測試標題";

newTitle.appendChild(document.createTextNode('任務標題'));

//找到被替換的標簽

const oldTitle=document.getElementById('Title');

//獲取父級

const fuClass=document.querySelector('.fuClass');

//替換

fuClass.replaceChild(newTitle,oldTitle);

console.log(oldTitle);

lt;div class="aa">aa</div>

<div class="bb">bb</div>

<div class="aa">aa</div>

<div class="fuClass"><h4 id="Title">jiajia</h4></div>

<ul>

<li><a href="/" class="delete second">11</a></li>

<li>22</li>

<li>33</li>

</ul>

const lis=document.querySelectorAll("li");

const list=document.querySelector("ul");

//第一種刪除方法

//lis[0].remove();

//第二種刪除方法

//list.removeChild(lis[1]);

//class && attr

const firstLi=document.querySelector("li:first-child");

const link=firstLi.children[0];

//a 類

let val;

val=link.className;

val=link.classList;

// val=link.classList[0];

link.classList.add('test');

link.classList.remove('test');

//a 屬性

val=link.getAttribute('href');

val=link.setAttribute('href','http://www.baidu.com');

link.setAttribute('title','百度');

link.removeAttribute('title');

val=link.hasAttribute('title');

console.log(val)