复制
1
2function runAsync(x) {
3  const p = new Promise(r =>
4    setTimeout(() => r(x, console.log(x)), 1000)
5  );
6  return p;
7}
8function runReject(x) {
9  const p = new Promise((res, rej) =>
10    setTimeout(() => rej(`Error: ${x}`, console.log(x)), 1000 * x)
11  );
12  return p;
13}
14Promise.race([runReject(0), runAsync(1), runAsync(2), runAsync(3)])
15  .then(res => console.log("result: ", res))
16  .catch(err => console.log(err));
17