js里得到值传给

function greet(name) {
    console.log("Hello, " + name);
}

let userName = "Alice";
greet(userName); // 输出: Hello, Alice

function updatePerson(person) {
    person.age = 30;
}

let person = { name: "Bob", age: 25 };
updatePerson(person);
console.log(person); // 输出: { name: "Bob", age: 30 }

function fetchData(callback) {
    setTimeout(() => {
        let data = "Some data";
        callback(data);
    }, 1000);
}

fetchData((data) => {
    console.log(data); // 输出: Some data
});

function updatePersonCopy(person) {
    let newPerson = { ...person }; // 创建对象的副本
    newPerson.age = 30;
    return newPerson;
}

let person = { name: "Bob", age: 25 };
let updatedPerson = updatePersonCopy(person);
console.log(person); // 输出: { name: "Bob", age: 25 }
console.log(updatedPerson); // 输出: { name: "Bob", age: 30 }