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HTML

              
                // 選單按鈕
i#openMenu.material-icons menu

// 側邊欄選單
-
 list = ['About', 'Products', 'News', 'Contact']
nav#menu
  ul
    each item in list
      li
        a(href='#')= item
              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Open+Sans)

body
  font: 13px/1.4 "Open Sans", sans-serif
  // 開啟側邊欄後顯示的黑色透明遮罩
  &:after
    content: ""
    display: block
    position: absolute
    left: 0
    top: 0
    width: 100%
    height: 100%
    background-color: rgba(0,0,0,.5)
    visibility: hidden
    opacity: 0
    cursor: pointer
    transition: .8s
  &.openMenu
    overflow: hidden  // 打開側邊欄時,讓 body 不可以捲動
    &:after
      visibility: visible
      opacity: 1

// 選單按鈕
#openMenu
  color: #999
  transition: .4s
  cursor: pointer
  &:hover
    color: #000


// 側邊欄選單
#menu
  position: fixed
  left: -280px
  top: 0
  z-index: 1 // 讓側邊欄在黑色遮罩上
  overflow: auto
  width: 280px
  max-width: 85%
  height: 100%
  background-color: #f5f5f5
  transition: .4s ease-in-out
  box-shadow: 0 0 8px rgba(0,0,0,.2)
  .openMenu &
    left: 0
  ul
    list-style: none
    padding: 0
    margin: 0
    li
      a
        display: block
        padding: 12px 24px
        background-color: #fff
        text-decoration: none
        color: #888
        border-bottom: 1px solid rgba(0,0,0,.12)
        transition: .4s
        &:hover
          color: #333
          background-color: #eee

              
            
!

JS

              
                document.getElementById('openMenu').addEventListener('click', function(e){
  document.body.classList.add('openMenu');
  e.stopPropagation(); // 讓 click 事件停止冒泡
  document.addEventListener('click', function(e){
    // 如果點擊側邊欄以外的區域,就關閉側邊欄
    if(!e.target.closest('#menu')){
      document.body.classList.remove('openMenu');
    }
  });
});
              
            
!
999px

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