javascript 一次捕获多个错误 [英] javascript catch multiple errors with one catch

问题描述

假设我有 3 个带有 promise 的函数:

Let's say I have 3 functions with promises:

function1().then(() => {
  function2().then(() => {
    function3().then(() => {      
    })
  })
}).catch((err) => {
  console.log(err);
})

我是否能够捕获由 3 个函数中的任何一个返回的错误?如果没有，我应该怎么做才能用一个语句捕获任何函数的 promise 返回的错误?

Would I be able to catch the error returned by any of the 3 functions? If not, what should I do in order to catch the errors returned by any of the functions' promises with one statement?

推荐答案

不是在主体中调用和链接它们，而是返回结果承诺并链接 .then 子句.

Instead of calling and chaining them in the bodies, return the resulting promise and chain the .then clauses.

function1().then(() => {
  // TODO: Something.
  return function2();
}).then(() => { // <-- This `.then` waits until `function2` has finished executing
  // TODO: Something.
  return function3();
}).then(() => { // <-- This `.then` waits until `function3` has finished executing
  // TODO: Something.
}).catch((err) => {
  console.log(err);
});

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