Node.js 错误处理最佳实践

使用 Promise 捕获错误

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
let func = function (n) {
  return new Promise((resolve, reject) => {
    resolve(n * n);
  });
};
func(2)
  .then(res => {
    console.log(res);
    return func(res);
  })
  .then(res => {
    console.log(res);
    throw new Error("Error");
  })
  .then(res => {
    console.log(res);
    return func(res);
  })
  .catch(err => {
    console.log(err);
  })
  .finally(() => {
    console.log("结束");
  });

使用 async/await 捕获错误

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
let func = function (n) {
  return new Promise((resolve, reject) => {
    resolve(n * n);
  });
};
async function asyncTask() {
  try {
    const valueA = await func(2);
    console.log(valueA);
    const valueB = await func(valueA);
    console.log(valueB);
    throw new Error("Error");
    const valueC = await func(valueB);
    console.log(valueC);
    return valueC;
  } catch (err) {
    console.log(err);
  } finally {
    console.log("结束");
  }
}
asyncTask();