js 函数 返回

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

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

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

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

function greet(name) {
  return `Hello, ${name}!`; // 确保返回一个值
}

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

async function getData() {
  return 'Data fetched';
}

// 使用 .then()
getData().then(data => console.log(data)); // 输出: Data fetched

// 使用 await
(async () => {
  const data = await getData();
  console.log(data); // 输出: Data fetched
})();