如何在promise中使用promise？

new Promise((resolve, reject) => {
    setTimeout(() => {
        resolve('First promise resolved');
    }, 1000);
})
.then((result) => {
    console.log(result);
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            resolve('Second promise resolved');
        }, 1000);
    });
})
.then((result) => {
    console.log(result);
})
.catch((error) => {
    console.error(error);
});

const promise1 = new Promise((resolve, reject) => {
    setTimeout(() => {
        resolve('Promise 1 resolved');
    }, 1000);
});

const promise2 = new Promise((resolve, reject) => {
    setTimeout(() => {
        resolve('Promise 2 resolved');
    }, 2000);
});

Promise.all([promise1, promise2])
.then((results) => {
    console.log(results[0]); // Output: "Promise 1 resolved"
    console.log(results[1]); // Output: "Promise 2 resolved"
})
.catch((error) => {
    console.error(error);
});

const promise1 = new Promise((resolve, reject) => {
    setTimeout(() => {
        resolve('Promise 1 resolved');
    }, 1000);
});

const promise2 = new Promise((resolve, reject) => {
    setTimeout(() => {
        resolve('Promise 2 resolved');
    }, 2000);
});

Promise.race([promise1, promise2])
.then((result) => {
    console.log(result); // Output: "Promise 1 resolved"
})
.catch((error) => {
    console.error(error);
});