下面给你一个 HTML5 + 原生 JavaScript 实现的 移动端购物车自动结算功能示例代码，结构清晰、可直接复制运行，支持：
- 数量加减
- 自动计算商品小计
- 自动更新总价
- 删除商品
- 移动端自适应（简单样式）
✔️ HTML5 实现移动端购物车自动结算 — 完整示例
下面是可以直接运行的 完整代码示例（HTML/CSS/JS 一体）。
📌 效果说明
- 点击 + － 按钮自动更新金额
- 修改数量输入框也会自动更新
- 可删除商品
- 总价实时刷新
⭐ 完整代码示例 (可直接复制运行)
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>移动端购物车</title>
<style>
body {
font-family: Arial, sans-serif;
padding: 10px;
background: #f5f5f5;
}
.cart-item {
display: flex;
padding: 10px;
background: #fff;
margin-bottom: 10px;
border-radius: 8px;
align-items: center;
}
.cart-item img {
width: 80px;
height: 80px;
border-radius: 6px;
margin-right: 10px;
flex-shrink: 0;
object-fit: cover;
}
.info { flex: 1; }
.title { font-size: 15px; margin-bottom: 5px; }
.price { color: #e4393c; font-weight: bold; margin-bottom: 5px; }
.qty-box {
display: flex;
align-items: center;
}
.qty-box button {
width: 30px;
height: 30px;
border: none;
background: #ddd;
font-size: 18px;
border-radius: 4px;
}
.qty-box input {
width: 40px;
text-align: center;
border: 1px solid #ccc;
margin: 0 5px;
height: 28px;
border-radius: 4px;
}
.delete {
color: #999;
font-size: 14px;
margin-left: 10px;
}
.total {
position: fixed;
bottom: 0;
left: 0;
right: 0;
background: #fff;
padding: 12px;
box-shadow: 0 -2px 5px rgba(0,0,0,0.1);
display: flex;
justify-content: space-between;
align-items: center;
}
.total-price {
font-size: 18px;
color: #e4393c;
font-weight: bold;
}
.pay-btn {
background: #ff5722;
color: #fff;
padding: 10px 18px;
border-radius: 6px;
}
</style>
</head>
<body>
<h2>购物车</h2>
<div id="cart-list">
<div class="cart-item" data-price="59.9">
<img src="https://via.placeholder.com/80">
<div class="info">
<div class="title">夏季T恤</div>
<div class="price">¥59.9</div>
<div class="qty-box">
<button class="minus">－</button>
<input type="number" class="qty" value="1">
<button class="plus">＋</button>
</div>
</div>
<span class="delete">删除</span>
</div>
<div class="cart-item" data-price="120">
<img src="https://via.placeholder.com/80">
<div class="info">
<div class="title">运动鞋</div>
<div class="price">¥120</div>
<div class="qty-box">
<button class="minus">－</button>
<input type="number" class="qty" value="1">
<button class="plus">＋</button>
</div>
</div>
<span class="delete">删除</span>
</div>
</div>
<!-- 底部结算栏 -->
<div class="total">
<span>合计：</span>
<span class="total-price">¥0</span>
<div class="pay-btn">去结算</div>
</div>
<script>
function calcTotal() {
let total = 0;
document.querySelectorAll(".cart-item").forEach(item => {
const price = parseFloat(item.dataset.price);
const qty = parseInt(item.querySelector(".qty").value) || 0;
total += price * qty;
});
document.querySelector(".total-price").innerText = "¥" + total.toFixed(2);
}
// 数量加减事件
document.querySelectorAll(".cart-item").forEach(item => {
const minus = item.querySelector(".minus");
const plus = item.querySelector(".plus");
const qtyInput = item.querySelector(".qty");
minus.onclick = () => {
let value = parseInt(qtyInput.value);
if (value > 1) qtyInput.value = value - 1;
calcTotal();
};
plus.onclick = () => {
qtyInput.value = parseInt(qtyInput.value) + 1;
calcTotal();
};
qtyInput.oninput = () => calcTotal();
// 删除商品
item.querySelector(".delete").onclick = () => {
item.remove();
calcTotal();
};
});
// 初次计算
calcTotal();
</script>
</body>
</html>