js调用方法返回值

function add(a, b) {
    return a + b;
}

const result = add(2, 3);
console.log(result); // 输出: 5

function fetchData(url) {
    return new Promise((resolve, reject) => {
        fetch(url)
            .then(response => response.json())
            .then(data => resolve(data))
            .catch(error => reject(error));
    });
}

fetchData('https://api.example.com/data')
    .then(data => console.log(data))
    .catch(error => console.error(error));

async function fetchData(url) {
    try {
        const response = await fetch(url);
        const data = await response.json();
        return data;
    } catch (error) {
        throw error;
    }
}

(async () => {
    try {
        const data = await fetchData('https://api.example.com/data');
        console.log(data);
    } catch (error) {
        console.error(error);
    }
})();

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

const greeting = greet('Alice');
console.log(greeting); // 输出: Hello, Alice!

async function fetchData(url) {
    try {
        const response = await fetch(url);
        const data = await response.json();
        return data;
    } catch (error) {
        throw error;
    }
}