<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">简单购物车 · 价格计算</title>
<style>
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
body {
background: linear-gradient(145deg, #f5f7fa 0%, #e9edf2 100%);
min-height: 100vh;
display: flex;
justify-content: center;
align-items: center;
font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
padding: 1.5rem;
margin: 0;
}
.cart-card {
max-width: 760px;
width: 100%;
background: rgba(255, 255, 255, 0.7);
backdrop-filter: blur(6px);
-webkit-backdrop-filter: blur(6px);
background-color: #ffffffdd;
border-radius: 32px;
padding: 2rem 2rem 2.2rem;
box-shadow: 0 20px 36px -8px rgba(0, 0, 0, 0.15), 0 4px 12px rgba(0, 0, 0, 0.05);
border: 1px solid rgba(255, 255, 255, 0.6);
transition: all 0.2s;
}
h2 {
display: flex;
align-items: center;
gap: 10px;
font-weight: 600;
font-size: 1.8rem;
letter-spacing: -0.02em;
color: #1f2a3a;
margin-bottom: 1.8rem;
border-bottom: 2px solid rgba(0, 0, 0, 0.04);
padding-bottom: 0.75rem;
}
h2 small {
font-size: 1rem;
font-weight: 400;
color: #5b6b7f;
margin-left: auto;
background: #eef2f6;
padding: 0.3rem 0.9rem;
border-radius: 30px;
letter-spacing: 0.3px;
}
.cart-item {
display: flex;
flex-wrap: wrap;
align-items: center;
justify-content: space-between;
background: white;
padding: 1rem 1.25rem;
border-radius: 20px;
margin-bottom: 0.9rem;
box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
border: 1px solid #f0f2f5;
transition: 0.15s ease;
}
.cart-item:hover {
border-color: #cbd5e1;
box-shadow: 0 6px 12px -8px rgba(0, 20, 40, 0.12);
}
.item-info {
display: flex;
align-items: center;
gap: 0.8rem;
flex: 2 1 180px;
}
.item-name {
font-weight: 550;
font-size: 1.15rem;
color: #182230;
}
.item-price {
background: #eef3f9;
padding: 0.2rem 0.8rem;
border-radius: 40px;
font-size: 0.85rem;
font-weight: 500;
color: #2b4b6f;
white-space: nowrap;
}
.qty-control {
display: flex;
align-items: center;
gap: 0.5rem;
background: #f2f5f9;
padding: 0.2rem 0.3rem;
border-radius: 60px;
margin: 0.4rem 0.6rem;
}
.qty-control button {
background: transparent;
border: none;
width: 34px;
height: 34px;
font-size: 1.4rem;
font-weight: 400;
line-height: 1;
color: #2c3e4f;
cursor: pointer;
border-radius: 40px;
transition: 0.1s;
display: inline-flex;
align-items: center;
justify-content: center;
}
.qty-control button:hover {
background: #dce3eb;
color: #0d1b2b;
}
.qty-control button:active {
background: #cbd5e1;
transform: scale(0.92);
}
.qty-num {
min-width: 28px;
text-align: center;
font-weight: 600;
font-size: 1.2rem;
color: #0b1c2e;
}
.item-subtotal {
min-width: 80px;
text-align: right;
font-weight: 600;
font-size: 1.2rem;
color: #1c314b;
letter-spacing: 0.2px;
padding-right: 0.2rem;
}
.delete-btn {
background: none;
border: none;
color: #949faf;
font-size: 1.3rem;
cursor: pointer;
padding: 0 0.2rem 0 0.8rem;
transition: 0.1s;
display: flex;
align-items: center;
}
.delete-btn:hover {
color: #c83a3a;
transform: scale(1.1);
}
.total-section {
margin-top: 2rem;
padding-top: 1.6rem;
border-top: 2px dashed #d0d9e3;
display: flex;
flex-wrap: wrap;
justify-content: space-between;
align-items: center;
gap: 0.8rem 1rem;
}
.total-label {
font-size: 1.2rem;
font-weight: 500;
color: #2b4059;
}
.total-amount {
font-size: 2rem;
font-weight: 650;
letter-spacing: -0.02em;
color: #0b1f33;
background: #eef4fa;
padding: 0.2rem 1.2rem;
border-radius: 80px;
}
.reset-btn {
background: #eef2f6;
border: 1px solid #dce3ea;
padding: 0.6rem 1.3rem;
border-radius: 40px;
font-weight: 500;
color: #2e4a66;
cursor: pointer;
transition: 0.15s;
font-size: 0.9rem;
box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}
.reset-btn:hover {
background: #dce5ef;
border-color: #b1c4d8;
color: #001c34;
}
.reset-btn:active {
transform: scale(0.96);
}
.empty-cart {
text-align: center;
padding: 2.2rem 0.5rem;
color: #6a7b90;
font-size: 1rem;
background: #f8faff;
border-radius: 40px;
margin: 0.2rem 0;
}
.hidden {
display: none !important;
}
.footer-note {
margin-top: 1.6rem;
font-size: 0.75rem;
color: #8799ae;
text-align: center;
border-top: 1px solid #e3eaf1;
padding-top: 1.2rem;
}
@media (max-width: 600px) {
.cart-card { padding: 1.5rem; }
.cart-item { flex-wrap: wrap; padding: 0.8rem 0.9rem; }
.item-info { flex-basis: 100%; margin-bottom: 0.4rem; }
.qty-control { margin-left: 0; }
.item-subtotal { min-width: 70px; }
.total-amount { font-size: 1.8rem; }
}
</style>
</head>
<body>
<div class="cart-card" role="main">
<h2>
🛒 购物车
<small id="itemCount">3 件商品</small>
</h2>
<!-- 购物车容器 -->
<div id="cartItemsContainer"></div>
<!-- 底部结算区 -->
<div class="total-section">
<span class="total-label">合计</span>
<span class="total-amount" id="totalPrice">¥0.00</span>
<button class="reset-btn" id="resetCartBtn" aria-label="清空购物车">🗑️ 清空</button>
</div>
<div class="footer-note">点击 +/- 调整数量 · 删除商品</div>
</div>
<script>
(function() {
// ---------- 商品初始数据 ----------
const INIT_ITEMS = [
{ id: 'item1', name: '无线蓝牙耳机', price: 249.00, quantity: 1 },
{ id: 'item2', name: '可折叠支架', price: 89.00, quantity: 2 },
{ id: 'item3', name: 'USB-C 数据线 (1m)', price: 39.90, quantity: 1 },
{ id: 'item4', name: '桌面收纳盒', price: 59.00, quantity: 1 }
];
// 当前状态 (深拷贝)
let cartItems = INIT_ITEMS.map(item => ({ ...item }));
// DOM 元素
const container = document.getElementById('cartItemsContainer');
const totalPriceEl = document.getElementById('totalPrice');
const itemCountEl = document.getElementById('itemCount');
const resetBtn = document.getElementById('resetCartBtn');
// ---------- 渲染购物车 ----------
function renderCart() {
// 过滤掉数量 <= 0 的商品（防御）
cartItems = cartItems.filter(item => item.quantity > 0);
// 如果购物车为空，显示空状态
if (cartItems.length === 0) {
container.innerHTML = `<div class="empty-cart">🛍️ 购物车是空的，点击「清空」恢复默认商品</div>`;
updateTotalAndCount();
return;
}
// 生成每个商品条目 HTML
let html = '';
cartItems.forEach(item => {
const subtotal = item.price * item.quantity;
html += `
<div class="cart-item" data-id="${item.id}">
<div class="item-info">
<span class="item-name">${escapeHtml(item.name)}</span>
<span class="item-price">¥${item.price.toFixed(2)}</span>
</div>
<div class="qty-control">
<button class="qty-btn minus" data-id="${item.id}" aria-label="减少数量">−</button>
<span class="qty-num">${item.quantity}</span>
<button class="qty-btn plus" data-id="${item.id}" aria-label="增加数量">+</button>
</div>
<span class="item-subtotal">¥${subtotal.toFixed(2)}</span>
<button class="delete-btn" data-id="${item.id}" aria-label="删除商品">✕</button>
</div>
`;
});
container.innerHTML = html;
updateTotalAndCount();
// 重新绑定事件 (事件委托在容器上, 但为了防止内存溢出, 使用容器监听)
// 已经在外部使用委托, 无需再绑定
}
// 简单的转义 (防止XSS 但数据可信, 仅做演示)
function escapeHtml(text) {
const div = document.createElement('div');
div.textContent = text;
return div.innerHTML;
}
// ---------- 更新总计和数量徽章 ----------
function updateTotalAndCount() {
const total = cartItems.reduce((sum, item) => sum + (item.price * item.quantity), 0);
totalPriceEl.textContent = `¥${total.toFixed(2)}`;
const count = cartItems.reduce((sum, item) => sum + item.quantity, 0);
itemCountEl.textContent = `${count} 件商品`;
}
// ---------- 核心操作: 修改数量 / 删除 ----------
function handleItemAction(target) {
// 通过匹配最近的 .cart-item 获取商品 id
const cartItemDiv = target.closest('.cart-item');
if (!cartItemDiv) return;
const id = cartItemDiv.dataset.id;
if (!id) return;
// 寻找商品索引
const index = cartItems.findIndex(item => item.id === id);
if (index === -1) return;
// 判断操作类型
if (target.classList.contains('plus')) {
// 增加数量 (上限 99)
if (cartItems[index].quantity < 99) {
cartItems[index].quantity += 1;
} else {
alert('数量最多为 99');
return;
}
renderCart();
}
else if (target.classList.contains('minus')) {
// 减少数量 (最少为 1, 减到0则删除)
if (cartItems[index].quantity > 1) {
cartItems[index].quantity -= 1;
} else {
// 数量为1 再减→移除
cartItems.splice(index, 1);
}
renderCart();
}
else if (target.classList.contains('delete-btn')) {
// 直接删除该商品
cartItems.splice(index, 1);
renderCart();
}
}
// ---------- 重置购物车 (清空后恢复默认) ----------
function resetCartToDefault() {
cartItems = INIT_ITEMS.map(item => ({ ...item }));
renderCart();
}
// ---------- 事件监听 (利用事件委托) ----------
container.addEventListener('click', function(e) {
const target = e.target.closest('button');
if (!target) return;
// 只处理购物车容器内的按钮 (plus, minus, delete)
if (target.classList.contains('qty-btn') || target.classList.contains('delete-btn')) {
e.preventDefault();
handleItemAction(target);
}
});
// 重置按钮
resetBtn.addEventListener('click', function(e) {
resetCartToDefault();
});
// ---------- 初始化渲染 ----------
renderCart();
// 附加: 若用户误触键盘等, 保持界面统一
console.log('✅ 简单购物车已启动 — 点击 +/- 修改数量，✕ 删除商品');
})();
</script>
</body>
</html>
购物车价格计算逻辑
您可以通过调整数量或删除商品,实时查看总价变化。
- 商品管理与数量调整：每个商品都配有“+/-”按钮，点击可增加或减少购买数量，当数量减至0时,该商品会自动从购物车中移除。
- 实时价格计算：每个商品的行小计和页面底部的“合计”金额会随您调整数量而立即更新,无需手动刷新。
- 购物车重置：如果您想重新开始，可以点击“清空”按钮,购物车将恢复为默认的商品列表和数量。
