js 关键字参数

function greet(firstName, lastName) {
    console.log(`Hello, ${firstName} ${lastName}`);
}

greet('John', 'Doe'); // 输出: Hello, John Doe

function greet({firstName, lastName}) {
    console.log(`Hello, ${firstName} ${lastName}`);
}

greet({lastName: 'Doe', firstName: 'John'}); // 输出: Hello, John Doe

function createUser({username, password, email, age = 18}) {
    // 创建用户的逻辑
    console.log(`Username: ${username}, Email: ${email}, Age: ${age}`);
}

createUser({username: 'user123', password: 'securePass', email: 'user@example.com'});
createUser({username: 'user456', password: 'pass123', age: 25});

function createUser({username, password, email, age = 18} = {}) {
    console.log(`Username: ${username ?? 'Anonymous'}, Email: ${email ?? 'No email provided'}, Age: ${age}`);
}

createUser(); // 输出: Username: Anonymous, Email: No email provided, Age: 18