javascript - 如何使用 async/await 捕获抛出的错误？

Question

这是一些代码:

  import 'babel-polyfill'

  async function helloWorld () {
    throw new Error ('hi')
  }

  helloWorld()

我也深入尝试过这个:

  import 'babel-polyfill'

  async function helloWorld () {
    throw new Error ('hi')
  }

  async function main () {
    try {
      await helloWorld()
    } catch (e) {
      throw e
    }
  }

  main()

和:

import 'babel-polyfill'

 async function helloWorld () {
   throw new Error ('hi')
 }

try {
 helloWorld()
} catch (e) {
 throw e
}

这个有效:

import 'babel-polyfill'

async function helloWorld () {
  throw new Error('xxx')
}

helloWorld()
.catch(console.log.bind(console))

Answer 1

async is meant to be used with Promises .如果您拒绝 promise ，那么您可以捕获错误，如果您解决 promise ，它将成为函数的返回值。

async function helloWorld () {
  return new Promise(function(resolve, reject){
    reject('error')
  });
}


try {
    await helloWorld();
} catch (e) {
    console.log('Error occurred', e);
}