前端學習程式碼例項-JavaScript商城購物車價格自動計算功能
摘要：
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:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name=...
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:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.softwhy.com/" />
<title>web前端開發學習q群：731771211詳細教程講解</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">我的帥氣一</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">我的智慧二</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>