const fetchData = () => {
    return new Promise((resolve, reject) => {
        reject(new Error('Failed to fetch data'));
    });
};

fetchData()
    .then(data => console.log(data)); // 缺少.catch()處理拒絕

const fetchDataAsync = async () => {
    const data = await fetchData(); // 如果fetchData()拒絕，沒(méi)有try/catch處理
    console.log(data);
};

fetchDataAsync();

const fetchDataSync = () => {
    return new Promise((resolve, reject) => {
        throw new Error('Failed to fetch data'); // 同步拋出錯(cuò)誤
    });
};

fetchDataSync()
    .then(data => console.log(data)); // 缺少.catch()處理拒絕

const fetchData = () => {
    return new Promise((resolve, reject) => {
        reject(new Error('Failed to fetch data'));
    });
};

fetchData()
    .then(data => console.log(data))
    .catch(error => console.error('Error:', error.message)); // 使用.catch()處理拒絕

const fetchDataAsync = async () => {
    try {
        const data = await fetchData();
        console.log(data);
    } catch (error) {
        console.error('Error:', error.message); // 使用try/catch捕獲錯(cuò)誤
    }
};

fetchDataAsync();

process.on('unhandledRejection', (reason, promise) => {
    console.error('Unhandled Rejection at:', promise, 'reason:', reason);
    // 在這里可以記錄日志或執(zhí)行其他錯(cuò)誤處理邏輯
});

const fetchData = () => {
    return new Promise((resolve, reject) => {
        reject(new Error('Failed to fetch data'));
    });
};

fetchData()
    .then(data => console.log(data)); // 即使沒(méi)有.catch()，也能通過(guò)unhandledRejection事件捕獲

const fetchData1 = () => Promise.resolve('Data 1');
const fetchData2 = () => Promise.reject(new Error('Failed to fetch data 2'));
const fetchData3 = () => Promise.resolve('Data 3');

Promise.all([fetchData1(), fetchData2(), fetchData3()])
    .then(results => console.log(results))
    .catch(error => console.error('Error:', error.message)); // 捕獲Promise.all中的拒絕