app性能测试双12活动

// 使用懒加载技术减少初始加载时间
const observer = new IntersectionObserver((entries, observer) => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
      const img = entry.target;
      img.src = img.dataset.src;
      observer.unobserve(img);
    }
  });
});

document.querySelectorAll('.lazy-load').forEach(img => {
  observer.observe(img);
});

// 使用Web Workers处理复杂计算，避免阻塞主线程
const worker = new Worker('worker.js');
worker.postMessage({ data: largeDataSet });
worker.onmessage = event => {
  console.log('Received result:', event.data);
};

# 使用缓存减少数据库查询次数
from django.core.cache import cache

def get_product_details(product_id):
  cache_key = f'product_{product_id}'
  product_details = cache.get(cache_key)
  if product_details is None:
    product_details = Product.objects.get(id=product_id)
    cache.set(cache_key, product_details, timeout=60) # 缓存60秒
  return product_details

# 使用异步任务处理耗时操作
from celery import shared_task

@shared_task
def send_email(to, subject, body):
  # 发送邮件的逻辑
  pass