Javascript承诺和错误处理- try/catch

// 使用Promise处理异步操作
function fetchData() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      const data = 'Hello, World!';
      if (data) {
        resolve(data);
      } else {
        reject('Error fetching data');
      }
    }, 1000);
  });
}

fetchData()
  .then(data => {
    console.log(data);
  })
  .catch(error => {
    console.error(error);
  });

// 使用try...catch处理同步代码中的错误
function divide(a, b) {
  try {
    if (b === 0) {
      throw new Error('Division by zero is not allowed');
    }
    return a / b;
  } catch (error) {
    console.error(error.message);
  }
}

console.log(divide(10, 2)); // 5
console.log(divide(10, 0)); // Division by zero is not allowed

async function fetchDataAsync() {
  try {
    const data = await fetchData();
    console.log(data);
  } catch (error) {
    console.error(error);
  }
}

fetchDataAsync();