在Node.js中处理Promise中错误的示例代码

const myPromise = new Promise((resolve, reject) => {
    const success = Math.random() > 0.5; // 随机决定是成功还是失败
    if (success) {
        resolve("操作成功!");
    } else {
        reject("操作失败!");
    }
});

// 使用Promise
myPromise
    .then(result => {
        console.log(result);
    })
    .catch(error => {
        console.error(error);
    });

function asyncOperation() {
    return new Promise((resolve, reject) => {
        const errorOccurred = true; // 设置为true表示错误发生
        if (errorOccurred) {
            reject("异步操作中的错误!");
        } else {
            resolve("异步操作成功!");
        }
    });
}

asyncOperation()
    .then(result => {
        console.log(result);
    })
    .catch(error => {
        console.error("捕获到错误:", error);
    });

function firstPromise() {
    return new Promise((resolve, reject) => {
        resolve("第一个Promise成功!");
    });
}

function secondPromise() {
    return new Promise((resolve, reject) => {
        reject("第二个Promise失败!");
    });
}

firstPromise()
    .then(result => {
        console.log(result);
        return secondPromise();
    })
    .then(result => {
        console.log(result);
    })
    .catch(error => {
        console.error("链式调用中捕获到错误:", error);
    });

const promise1 = Promise.resolve("第一个Promise");
const promise2 = Promise.reject("第二个Promise失败!");
const promise3 = Promise.resolve("第三个Promise");

Promise.all([promise1, promise2, promise3])
    .then(results => {
        console.log("所有Promise成功:", results);
    })
    .catch(error => {
        console.error("捕获到错误:", error);
    });

async function asyncFunction() {
    try {
        const result1 = await firstPromise();
        console.log(result1); // 第一个Promise成功!
        
        const result2 = await secondPromise(); // 这里将抛出错误
        console.log(result2);
    } catch (error) {
        console.error("在异步函数中捕获到错误:", error);
    }
}

asyncFunction();