购物车（HTML+JS+CSS）

上图！！！

HTML源码

html 复制代码

<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>购物车</title>
  <link rel="stylesheet" href="static/css/购物车.css">
</head>
<body>

<div class="cart-container">
  <div class="cart-header">🛒 购物车</div>

  <table class="cart-table">
    <thead>
      <tr>
        <th class="col-check">
          <input type="checkbox" id="selectAll" title="全选">
        </th>
        <th class="col-product">商品</th>
        <th class="col-price">单价</th>
        <th class="col-qty">数量</th>
        <th class="col-subtotal">小计</th>
        <th class="col-action">操作</th>
      </tr>
    </thead>
    <tbody id="cartBody">
      <!-- JS 动态渲染 -->
    </tbody>
  </table>

  <!-- 底部结算栏 -->
  <div class="cart-footer">
    <div class="footer-left">
      <label class="select-all-label">
        <input type="checkbox" id="selectAllBottom"> 全选
      </label>
      <span class="selected-info" id="selectedInfo">已选 0 件商品</span>
    </div>
    <div class="footer-right">
      <div class="total-amount">
        <span class="total-label">总计:</span>
        <span class="total-price" id="totalPrice">¥0</span>
      </div>
      <button class="btn-checkout" id="btnCheckout">结算</button>
    </div>
  </div>
</div>

<script>
// ==================== 购物车逻辑 ====================

// 默认商品数据
const defaultData = [
  { id: 1, name: 'iPhone 15',  price: 5999, qty: 1, checked: true,  icon: '📱' },
  { id: 2, name: 'AirPods',   price: 1299, qty: 2, checked: true,  icon: '🎧' },
  { id: 3, name: 'MacBook Pro', price: 14999, qty: 1, checked: false, icon: '💻' },
  { id: 4, name: 'iPad Air',   price: 4799, qty: 1, checked: false, icon: '📋' },
];

// 从 localStorage 读取，没有则用默认数据
const STORAGE_KEY = 'cart_data';
let cartData = JSON.parse(localStorage.getItem(STORAGE_KEY)) || defaultData;

// ==================== DOM 引用 ====================
const cartBody    = document.getElementById('cartBody');
const selectAll  = document.getElementById('selectAll');
const selectAllBottom = document.getElementById('selectAllBottom');
const selectedInfo = document.getElementById('selectedInfo');
const totalPriceEl = document.getElementById('totalPrice');
const btnCheckout = document.getElementById('btnCheckout');

// ==================== 工具函数 ====================
const formatMoney = (n) => `¥${n.toLocaleString()}`;

function calcTotal() {
  const { count, sum } = cartData.reduce(
    (acc, item) => {
      if (item.checked) {
        acc.count += item.qty;
        acc.sum += item.price * item.qty;
      }
      return acc;
    },
    { count: 0, sum: 0 }
  );
  selectedInfo.textContent = `已选 ${count} 件商品`;
  totalPriceEl.textContent = formatMoney(sum);
}

function syncSelectAll() {
  const allChecked = cartData.length > 0 && cartData.every(item => item.checked);
  selectAll.checked = allChecked;
  selectAllBottom.checked = allChecked;
}

function saveToStorage() {
  localStorage.setItem(STORAGE_KEY, JSON.stringify(cartData));
}

function refreshUI() {
  calcTotal();
  syncSelectAll();
  saveToStorage();
}

// ==================== 渲染 ====================
function render() {
  if (cartData.length === 0) {
    cartBody.innerHTML = `
      <tr>
        <td colspan="6">
          <div class="empty-cart">
            <span class="empty-icon">🛒</span>
            购物车是空的，去逛逛吧～
          </div>
        </td>
      </tr>`;
  } else {
    cartBody.innerHTML = cartData
      .map(
        ({ id, name, price, qty, checked, icon }) => `
        <tr data-id="${id}">
          <td class="cell-check">
            <input type="checkbox" class="item-check" ${checked ? 'checked' : ''}>
          </td>
          <td>
            <div class="product-info">
              <div class="product-img">${icon}</div>
              <span class="product-name">${name}</span>
            </div>
          </td>
          <td class="cell-price">${formatMoney(price)}</td>
          <td>
            <div class="quantity-control">
              <button class="qty-btn btn-minus" ${qty <= 1 ? 'disabled' : ''}>−</button>
              <input type="number" class="qty-input" value="${qty}" min="1" readonly>
              <button class="qty-btn btn-plus">+</button>
            </div>
          </td>
          <td class="cell-subtotal">${formatMoney(price * qty)}</td>
          <td style="text-align:center">
            <button class="btn-delete">删除</button>
          </td>
        </tr>`
      )
      .join('');
  }
  refreshUI();
}

// ==================== 事件委托（给 tbody 绑定一个事件处理所有按钮） ====================
cartBody.addEventListener('click', (e) => {
  const btn = e.target;
  const row = btn.closest('tr');
  if (!row) return;
  const id = +row.dataset.id;
  const item = cartData.find(p => p.id === id);
  if (!item) return;

  // --- 减号按钮 ---
  if (btn.classList.contains('btn-minus')) {
    if (item.qty > 1) {
      item.qty--;
      render();
    }
  }

  // --- 加号按钮 ---
  if (btn.classList.contains('btn-plus')) {
    item.qty++;
    render();
  }

  // --- 删除按钮 ---
  if (btn.classList.contains('btn-delete')) {
    cartData = cartData.filter(p => p.id !== id);
    render();
  }

  // --- 单个商品勾选 ---
  if (btn.classList.contains('item-check')) {
    item.checked = btn.checked;
    refreshUI();
  }
});

// ==================== 全选 / 取消全选 ---
function handleSelectAll(e) {
  const checked = e.target.checked;
  cartData.forEach(item => (item.checked = checked));
  render();
}

selectAll.addEventListener('change', handleSelectAll);
selectAllBottom.addEventListener('change', handleSelectAll);

// ==================== 结算按钮 ====================
btnCheckout.addEventListener('click', () => {
  const selected = cartData.filter(item => item.checked);
  if (selected.length === 0) {
    alert('请先选择要结算的商品！');
    return;
  }
  const result = selected.map(({ id, name, price, qty }) => ({
    id,
    name,
    price,
    qty,
    subtotal: price * qty,
  }));
  console.log('结算商品（JSON）:', JSON.stringify(result, null, 2));
  console.table(result);
  alert(`已选中 ${selected.length} 件商品，详情已输出到控制台`);
});

// ==================== 初始化 ====================
render();
</script>

</body>
</html>

CSS源码

css 复制代码

/* ========== 购物车样式 ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: #f5f6f8;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 40px 20px;
}

.cart-container {
  width: 880px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

/* 标题栏 */
.cart-header {
  padding: 24px 28px 0;
  font-size: 22px;
  font-weight: 700;
  color: #1a1a2e;
  border-bottom: 1px solid #eee;
  padding-bottom: 18px;
}

/* 表格 */
.cart-table {
  width: 100%;
  border-collapse: collapse;
}

.cart-table thead th {
  padding: 14px 16px;
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  color: #888;
  background: #fafbfc;
  border-bottom: 1px solid #eee;
  white-space: nowrap;
}

.cart-table thead th.col-check {
  width: 60px;
  text-align: center;
}
.cart-table thead th.col-product {
  width: auto;
}
.cart-table thead th.col-price {
  width: 120px;
}
.cart-table thead th.col-qty {
  width: 150px;
  text-align: center;
}
.cart-table thead th.col-subtotal {
  width: 120px;
}
.cart-table thead th.col-action {
  width: 80px;
  text-align: center;
}

.cart-table tbody td {
  padding: 16px;
  vertical-align: middle;
  border-bottom: 1px solid #f0f0f0;
  font-size: 14px;
  color: #333;
}

/* 复选框统一样式 */
input[type="checkbox"] {
  width: 17px;
  height: 17px;
  accent-color: #4361ee;
  cursor: pointer;
}

.cart-table .cell-check {
  text-align: center;
}

/* 商品信息 */
.product-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.product-img {
  width: 60px;
  height: 60px;
  border-radius: 8px;
  background: linear-gradient(135deg, #e8ecf1, #d5dbe3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.product-name {
  font-weight: 600;
  color: #1a1a2e;
}

/* 价格 */
.cell-price {
  font-weight: 600;
  color: #1a1a2e;
}

/* 数量控制 */
.quantity-control {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
}

.qty-btn {
  width: 32px;
  height: 32px;
  border: 1px solid #d0d5dd;
  background: #fff;
  font-size: 16px;
  color: #333;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  user-select: none;
}

.qty-btn:first-child {
  border-radius: 6px 0 0 6px;
}

.qty-btn:last-child {
  border-radius: 0 6px 6px 0;
}

.qty-btn:hover:not(:disabled) {
  background: #f0f3ff;
  border-color: #4361ee;
  color: #4361ee;
}

.qty-btn:active:not(:disabled) {
  background: #e0e5ff;
}

/* disabled 样式 */
.qty-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  background: #f5f5f5;
  color: #bbb;
}

.qty-input {
  width: 48px;
  height: 32px;
  border: 1px solid #d0d5dd;
  border-left: none;
  border-right: none;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: #333;
  outline: none;
  -moz-appearance: textfield;
}

.qty-input::-webkit-outer-spin-button,
.qty-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* 小计 */
.cell-subtotal {
  font-weight: 700;
  color: #e63946;
  font-size: 15px;
}

/* 删除按钮 */
.btn-delete {
  background: none;
  border: none;
  color: #999;
  font-size: 14px;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 4px;
  transition: all 0.15s;
}

.btn-delete:hover {
  color: #e63946;
  background: #fff5f5;
}

/* 底部栏 */
.cart-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  background: #fafbfc;
  border-top: 1px solid #eee;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.select-all-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: #555;
  cursor: pointer;
  user-select: none;
}

.select-all-label input[type="checkbox"] {
  margin: 0;
}

.selected-info {
  font-size: 14px;
  color: #888;
  margin-left: 8px;
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.total-amount {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.total-label {
  font-size: 14px;
  color: #555;
}

.total-price {
  font-size: 22px;
  font-weight: 700;
  color: #e63946;
}

.btn-checkout {
  padding: 12px 32px;
  background: linear-gradient(135deg, #4361ee, #3a56d4);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-checkout:hover {
  background: linear-gradient(135deg, #3a56d4, #2d44b5);
  box-shadow: 0 4px 12px rgba(67, 97, 238, 0.35);
}

.btn-checkout:active {
  transform: scale(0.98);
}

/* 空购物车 */
.empty-cart {
  text-align: center;
  padding: 60px 20px;
  color: #bbb;
  font-size: 15px;
}

.empty-cart .empty-icon {
  font-size: 48px;
  display: block;
  margin-bottom: 12px;
}