// 这是一个 JavaScript 函数示例
function calculateTotal(items) {
  return items.reduce((sum, item) => {
    return sum + item.price * item.quantity
  }, 0)
}

const cart = [
  { name: '苹果', price: 5, quantity: 3 },
  { name: '香蕉', price: 3, quantity: 5 },
]

const total = calculateTotal(cart)
console.log(`总价: ¥${total}`)

interface Product {
  id: number
  name: string
  price: number
  category: string
  inStock: boolean
}

class ProductManager {
  private products: Product[] = []

  addProduct(product: Product): void {
    this.products.push(product)
  }

  findProduct(id: number): Product | undefined {
    return this.products.find((p) => p.id === id)
  }

  getProductsByCategory(category: string): Product[] {
    return this.products.filter((p) => p.category === category)
  }
}

import requests
from typing import Dict, List
import json

def fetch_user_data(user_id: int) -> Dict:
    """获取用户数据"""
    url = f"https://api.example.com/users/{user_id}"

    try:
        response = requests.get(url, timeout=10)
        response.raise_for_status()
        return response.json()
    except requests.RequestException as e:
        print(f"请求失败: {e}")
        return {}

def process_users(user_ids: List[int]) -> List[Dict]:
    """批量处理用户数据"""
    results = []
    for user_id in user_ids:
        user_data = fetch_user_data(user_id)
        if user_data:
            results.append(user_data)
    return results

# Git 常用命令
git init
git add .
git commit -m "Initial commit"
git remote add origin https://github.com/username/repo.git
git push -u origin main

# Docker 命令
docker build -t my-app:latest .
docker run -p 3000:3000 my-app:latest
docker logs -f container_id

# NPM 命令
npm install --save react react-dom
npm run dev
npm run build
npm test

- const oldFunction = (param) => {
+ const newFunction = (param, options = {}) => {
-   return param * 2;
+   const multiplier = options.multiplier || 2;
+   return param * multiplier;
+ };