将Async/Await响应保存在变量上 [英] Save Async/Await response on a variable

问题描述

我正在尝试使用async/await和try/catch了解异步调用.

I am trying to understand async calls using async/await and try/catch.

在下面的示例中，如何保存对变量的成功响应，该变量可以在其余的代码中使用?

In the example below, how can I save my successful response to a variable that can be utilized throughout the rest of the code?

const axios = require('axios');
const users = 'http://localhost:3000/users';

const asyncExample = async () =>{
    try {
        const data = await axios(users);
        console.log(data); //200
    }
    catch (err) {
        console.log(err);
    }
};

//Save response on a variable
const globalData = asyncExample(); 
console.log(globalData) //Promise { <pending> }

推荐答案

1)从您的asyncExample函数返回一些内容

1) Return something from your asyncExample function

const asyncExample = async () => {
  const result = await axios(users)

  return result
}

2)调用该函数并处理其返回的Promise:

2) Call that function and handle its returned Promise:

;(async () => {
  const users = await asyncExample()
  console.log(users)
})()

这就是为什么要这样处理:

Here's why should you handle it like this:

• 您不能做顶级await(有提案尽管如此); await必须存在于async函数中.

• You can't do top-level await (there's a proposal for it though); await must exist within an async function.

但是我必须指出，您的原始示例不需要async/await 根本由于axios已经返回了Promise，因此您只需执行以下操作:

However I must point out that your original example doesn't need async/await at all; Since axios already returns a Promise you can simply do:

const asyncExample = () => {
  return axios(users)
}

const users = await asyncExample()

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