PHP 代码示例fsf
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<?php
class HelloWorld {
private $message;
public function __construct($message = 'Hello World!') {
$this->message = $message;
}
public function sayHello() {
return $this->message;
}
}
// 创建实例并调用
$hello = new HelloWorld();
echo $hello->sayHello(); // 输出: Hello World!
JavaScript 代码示例
// ES6 类定义
class Person {
constructor(name, age) {
this.name = name;
this.age = age;
}
sayHello() {
return `Hi, I'm ${this.name}, ${this.age} years old.`;
}
}
// Promise 示例
const fetchData = () => {
return new Promise((resolve, reject) => {
setTimeout(() => {
const data = { id: 1, name: 'Test' };
Math.random() > 0.5 ? resolve(data) : reject('Error!');
}, 1000);
});
}
// Async/Await 使用
async function getData() {
try {
const result = await fetchData();
console.log(result);
} catch (error) {
console.error(error);
}
}
Python 代码示例
from typing import List, Optional
import asyncio
class DataProcessor:
def __init__(self, data: List[int]):
self.data = data
async def process(self) -> Optional[List[int]]:
if not self.data:
return None
# 模拟异步处理
await asyncio.sleep(1)
return sorted(self.data)
@staticmethod
def filter_positive(numbers: List[int]) -> List[int]:
return [n for n in numbers if n > 0]
# 使用示例
async def main():
processor = DataProcessor([3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5])
result = await processor.process()
filtered = DataProcessor.filter_positive(result)
print(f"Processed data: {filtered}")
if __name__ == "__main__":
asyncio.run(main())
SQL 代码示例
-- 创建用户表
CREATE TABLE users (
id INT PRIMARY KEY AUTO_INCREMENT,
username VARCHAR(50) NOT NULL UNIQUE,
email VARCHAR(100) NOT NULL,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);
-- 插入数据
INSERT INTO users (username, email) VALUES
('john_doe', 'john@example.com'),
('jane_doe', 'jane@example.com');
-- 复杂查询示例
SELECT
u.username,
COUNT(p.id) as post_count,
MAX(p.created_at) as last_post_date
FROM users u
LEFT JOIN posts p ON u.id = p.user_id
WHERE u.created_at >= DATE_SUB(NOW(), INTERVAL 1 MONTH)
GROUP BY u.id
HAVING post_count > 0
ORDER BY post_count DESC
LIMIT 10;
HTML/CSS 代码示例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>样式测试</title>
<style>
.container {
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
}
.card {
padding: 2rem;
border-radius: 1rem;
background: rgba(255, 255, 255, 0.9);
box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
backdrop-filter: blur(10px);
transition: transform 0.3s ease;
}
.card:hover {
transform: translateY(-5px);
}
@media (max-width: 768px) {
.card {
margin: 1rem;
padding: 1rem;
}
}
</style>
</head>
<body>
<div class="container">
<div class="card">
<h1>Hello, World!</h1>
<p>这是一个样式测试。</p>
</div>
</div>
</body>
</html>
Shell 脚本示例
#!/bin/bash
# 定义颜色
RED='\033[0;31m'
GREEN='\033[0;32m'
NC='\033[0m' # No Color
# 函数定义
function check_status() {
if [ $? -eq 0 ]; then
echo -e "${GREEN}Success${NC}"
else
echo -e "${RED}Failed${NC}"
exit 1
fi
}
# 主要逻辑
echo "Starting deployment..."
# 更新代码
git pull origin main
check_status
# 安装依赖
npm install
check_status
# 构建项目
npm run build
check_status
echo "Deployment completed successfully!"
