Vue

Element classList

Element classList add (新增class)

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classList.add('新增名稱')
classList.add('新增名稱', '新增名稱', '新增名稱')

Element classList remove (刪除class)

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.classList.remove("移除名稱");
classList.remove('移除名稱', '移除名稱', '移除名稱')

Element toggle remove (切換class)

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.classList.toggle("切換名稱");

Element classList contains (判斷 class 是否存在)

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Element.classList.contains('className')

Ex.新增class，刪除class，toggle

綁定點擊按鈕元件 ＝> 執行事件函式
新增clss, Visible
刪除clss, Visible
toggle, Visible
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html
<a class="addBtn">Add</a>
<a class="removeBtn">Remove</a>
<a class="toggleBtn">Toggle</a>
<div class="menu-list"> 
  <ul>
    <li>One</li>
    <li>Two</li>
     <li>Three</li>
  </ul>
</div>
Scss
body{
  padding:20px;
}
a {
  padding:6px 22px;
  color:white;
  border-radius: 8px 8px 0px 0px;
}
.addBtn{
   background-color:green;
}
.removeBtn{
   background-color:red;
}
.toggleBtn{
   background-color:#009688;
}
.menu-list{
  display:none;
  background-color:#eee;
   margin-top:8px;
  padding:15px;
  ul{
    padding-inline-start: 30px;
    margin-block-start: 0em;
    list-style-type: none;
    li{
       list-style-type: none;
       padding-inline-start: 0px;
    }
  }
}
.Visible{
  display:flex;
}

js
const addBtn = document.querySelector(".addBtn");
addBtn.addEventListener('click',() => {
  const menuList = document.querySelector(".menu-list");
  menuList.classList.add("Visible")
})

const removeBtn = document.querySelector(".removeBtn");
removeBtn.addEventListener('click',() => {
  const menuList = document.querySelector(".menu-list");
  menuList.classList.remove("Visible")
})

const toggleBtn = document.querySelector(".toggleBtn");
toggleBtn.addEventListener('click',() => {
  const menuList = document.querySelector(".menu-list");
  menuList.classList.toggle("Visible")
})