JavaScript商城購物車價格自動計算功能

antzone發表於2018-07-12
JavaScript

本章節分享一段程式碼例項，它實現購物車價格自動計算功能。

程式碼例項如下:

[HTML] 純文字檢視 複製程式碼執行程式碼
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.softwhy.com/" />
<title>螞蟻部落</title>
<style type="text/css">
#imgtest{
  position:absolute;
  top:100px;
  left:400px;
  z-index:1;
}
table{
  left:100px;
  font-size:20px;
}
</style>
<script>
function total(id){
  /*計算單個的價格*/
  var quantity=document.getElementById("quantity"+id).value;
  var price=document.getElementById("price"+id).value;
  var smallTotal=quantity*price;
  var smallT=document.getElementById("smallTotal"+id);
  smallT.innerHTML=smallTotal;
  
  /*計算總價格*/
  var totalPrice=0;
  for(var a=1;a<3;a++){
    var quantity=document.getElementById("quantity"+a).value;
    var price=document.getElementById("price"+a).value;
    var smallTotal=quantity*price;
    totalPrice=totalPrice+smallTotal;
  }
  var total=document.getElementById("total");
  total.innerHTML=totalPrice;
}
function initialize(){
  var totalPrice=0;
  for(var a=1;a<3;a++){
    var quantity=document.getElementById("quantity"+a).value;
    var price=document.getElementById("price"+a).value;
    var smallTotal=quantity*price;
    totalPrice=totalPrice+smallTotal;
    var smallT=document.getElementById("smallTotal"+a);
    smallT.innerHTML=smallTotal;
  }
  /*取出購物車的所有商品的價格總和*/
  var total=document.getElementById("total");
  total.innerHTML=totalPrice;
}
window.onload=function(){
  initialize();
}
</script>
 </head>
 <body>
  <div id="imgtest"></div>
  <table border="1" style="text-align:center;" align="center">
   <thead style="height:50">
    <td style="width:300px">商品名稱</td>
    <td style="width:170px">數量</td>
    <td style="width:170px">價格</td>
    <td style="width:250px">小計</td>
   </thead>
   <tbody>
    <tr>
     <td class="name">螞蟻部落一</td>
     <td class="quantity"><input id="quantity1" value="1"/></td>
     <td class="price"><input type="hidden" id="price1" value="20"/>20</td>
     <td class="total"><span id="smallTotal1"></span> 元</td>
    </tr>
    <tr>
     <td class="name">螞蟻部落二</td>
     <td class="quantity"><input id="quantity2" value="2"/></td>
     <td class="price"><input type="hidden" id="price2" value="30"/>30</td>
     <td class="total"><span id="smallTotal2"></span> 元</td>
    </tr>
    <tr>
     <td colspan="3" class="cart_total"></td>
     <td><span class="red">總計:</span><span id="total"></span>  元</td>
    </tr>
   </tbody>
  </table>
</body>
</html>

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