app性能监测 秒杀

// 图片懒加载
const images = document.querySelectorAll('img[data-src]');
const observer = new IntersectionObserver((entries, observer) => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
      const img = entry.target;
      img.src = img.dataset.src;
      observer.unobserve(img);
    }
  });
});
images.forEach(img => observer.observe(img));

// 代码压缩
// 可以通过构建工具如 Webpack 进行代码压缩

from flask import Flask, jsonify
import redis

app = Flask(__name__)
cache = redis.Redis(host='localhost', port=6379)

@app.route('/product/<int:id>')
def get_product(id):
    product_info = cache.get(f'product_{id}')
    if product_info is None:
        # 从数据库获取数据并存入缓存
        product_info = fetch_from_database(id)
        cache.setex(f'product_{id}', 3600, product_info)
    else:
        product_info = product_info.decode('utf-8')
    return jsonify(product_info)

def fetch_from_database(id):
    # 模拟从数据库获取数据
    return f'Product info for id {id}'