购物车小程序搭建

// 示例代码：使用腾讯云云数据库进行数据存储
const cloud = require('wx-server-sdk');
cloud.init();
const db = cloud.database();

exports.main = async (event, context) => {
  try {
    await db.collection('shoppingCart').doc(event.userId).update({
      data: {
        items: event.items
      }
    });
    return { success: true };
  } catch (e) {
    console.error(e);
    return { success: false, error: e };
  }
};

// 示例代码：使用WebSocket实时更新购物车数据
const WebSocket = require('ws');

const ws = new WebSocket('wss://your-websocket-server');

ws.on('message', (data) => {
  const updatedCart = JSON.parse(data);
  // 更新前端购物车显示
  updateCartDisplay(updatedCart);
});

function updateCartDisplay(cart) {
  // 更新购物车UI
}

// 示例代码：前端防抖处理
function debounce(func, wait) {
  let timeout;
  return function(...args) {
    clearTimeout(timeout);
    timeout = setTimeout(() => func.apply(this, args), wait);
  };
}

const addToCart = debounce((productId) => {
  // 添加商品到购物车的逻辑
}, 300);

button.addEventListener('click', () => {
  addToCart(productId);
});