首先是構思

我們使用<input type="checkbox">標籤來實現這個效果。
checkbox的選中、未選中的特性，剛好對應開關的開啟、關閉
on:開啟 off:關閉

<label for="ck2">
  <input type="checkbox" id="ck2">
  <span>未選中，則關閉開關</span>
</label>
<br>
<label for="ck1">
  <input type="checkbox" id="ck1" checked>
  <span>選中，則開啟開關</span>
</label>
 

開始畫出off、on狀態的草圖

這裡要講解一下，使用了position來實現的定位。有不瞭解的同學可以開啟MDN檢視相關知識

<P>off狀態草圖</P>
<div class="toggle">
  <div class="cookie"></div>
</div>
<br>
<P>on狀態草圖</P>
<div class="toggle2">
  <div class="cookie2"></div>
</div>

.toggle{
  display:inline-block;
  position:relative;
  height:25px;
  width:50px;  
  border-radius:4px;
  background:#CC0000;
}
.cookie{
  position:absolute;
  left:2px;
  top:2px;
  bottom:2px;
  width:50%;
  background:rgba(230,230,230,0.9);
  border-radius:3px;
}
.toggle2{
  display:inline-block;
  position:relative;
  height:25px;
  width:50px; 
  padding:2px;
  border-radius:4px;
  background:#66CC33;  
}
.cookie2{
  position:absolute;
  right:2px;
  top:2px;
  bottom:2px;  
  width:50%;
  background:rgba(230,230,230,0.9);
  border-radius:3px;
}
 

然後我們將這兩個草圖放到label內

<label for="ck4">
  <input type="checkbox" id="ck4">
  <div class="toggle">
    <div class="cookie"></div>
  </div>
</label>
<br>
<label for="ck3">
  <input type="checkbox" id="ck3" checked>
  <div class="toggle2">
    <div class="cookie2"></div>
  </div>
</label>
 

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結合label和checkbox整理、優化css

<label for="ck5">
  <input type="checkbox" id="ck5">
  <div class="toggle-finish">
    <div class="cookie-finish"></div>
  </div>
</label>
<br>
<label for="ck6">
  <input type="checkbox" id="ck6" checked>
  <div class="toggle-finish">
    <div class="cookie-finish"></div>
  </div>
</label>

.toggle-finish{
  cursor:pointer;
  display:inline-block;
  position:relative;
  height:25px;
  width:50px;  
  border-radius:4px;
  background:#CC0000;
}
.cookie-finish{
  position:absolute;
  left:2px;
  top:2px;
  bottom:2px;
  width:50%;
  background:rgba(230,230,230,0.9);
  border-radius:3px;
}
input:checked + .toggle-finish{
  background:#66CC33;  
}
input:checked + .toggle-finish .cookie-finish{ 
  left:auto;
  right:2px;
}

到此為止就已經基本實現一個開關的功能了，記得將input隱藏起來哦