移动管理平台双11促销活动

// 使用懒加载技术优化图片加载
document.addEventListener("DOMContentLoaded", function() {
    const images = document.querySelectorAll("img.lazy");
    const observer = new IntersectionObserver((entries, observer) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                const img = entry.target;
                img.src = img.dataset.src;
                img.classList.remove("lazy");
                observer.unobserve(img);
            }
        });
    });
    images.forEach(img => observer.observe(img));
});

# 使用缓存减少数据库查询次数
from flask import Flask, jsonify
from flask_caching import Cache

app = Flask(__name__)
cache = Cache(app, config={'CACHE_TYPE': 'simple'})

@app.route('/products')
@cache.cached(timeout=60)
def get_products():
    # 模拟从数据库获取数据
    products = fetch_products_from_db()
    return jsonify(products)

def fetch_products_from_db():
    # 实际的数据库查询逻辑
    pass