移动开发秒杀

// 示例代码：前端倒计时
function startCountdown(endTime) {
    const interval = setInterval(() => {
        const now = new Date().getTime();
        const distance = endTime - now;
        if (distance < 0) {
            clearInterval(interval);
            document.getElementById('countdown').innerHTML = "EXPIRED";
        } else {
            const days = Math.floor(distance / (1000 * 60 * 60 * 24));
            const hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
            const minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
            const seconds = Math.floor((distance % (1000 * 60)) / 1000);
            document.getElementById('countdown').innerHTML = `${days}d ${hours}h ${minutes}m ${seconds}s`;
        }
    }, 1000);
}

# 示例代码：后端库存扣减
import redis

r = redis.Redis(host='localhost', port=6379, db=0)

def deduct_stock(product_id, quantity):
    stock_key = f"stock:{product_id}"
    current_stock = r.get(stock_key)
    if current_stock and int(current_stock) >= quantity:
        r.decrby(stock_key, quantity)
        return True
    return False