js函数里调用函数

function greet(name) {
    return `Hello, ${name}!`;
}

function sayHello() {
    const message = greet('World');
    console.log(message);
}

sayHello(); // 输出: Hello, World!

function fetchData(callback) {
    setTimeout(() => {
        const data = { name: 'Alice', age: 25 };
        callback(data);
    }, 1000);
}

function processData(data) {
    console.log(`Name: ${data.name}, Age: ${data.age}`);
}

fetchData(processData); // 1秒后输出: Name: Alice, Age: 25

function fetchData() {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            const data = { name: 'Alice', age: 25 };
            resolve(data);
        }, 1000);
    });
}

fetchData().then(processData); // 1秒后输出: Name: Alice, Age: 25

async function fetchAndProcessData() {
    const data = await fetchData();
    processData(data);
}

fetchAndProcessData(); // 1秒后输出: Name: Alice, Age: 25