Nodejs - 数组不返回任何内容

Question

I'm trying to save the answer to my request with axios in an array, but I'm not getting it, is something wrong?

colorList = axios.get(colors);

let codes = [];

for (let i = 0; i < colorList.data.data.colors.length; i++) {
  codes[i].push(colorList.data.data.colors[i]);
}

console.log(codes);

Answer 1

The call is asynchronous meaning that you have to wait for your request to complete (or more accurately your promise from axios.get() to resolve) and do something with the result. Your code right now runs synchronously.

colorList = axios.get(colors).then(result =>{
  console.log(result)
});

EDIT: Or as a comment above noted, use an async/await setup. Keep in mind that you can't use await in top level code, it can only be used inside an async function

(async () => {
    try {
        const colorCodes = await axios.get(colors);
    } catch (e) {
        // handle error
    }
})()

Answer 2

As most comments pointed out, the mistake in your code is that you don't await for the async call to be completed.The way that js works when you use async code is that it jumps to the next line immediatelly while the async process continues. That's the point of Async code: You don't want your program to freeze in case of async call delays. I made a similar code example using numbersapi.

var axios = require('axios');

const axiosCallToArray = async () => {
  const result = await axios.get('http://numbersapi.com/42');

  const wordsArray = result.data.split(' '); // here i create an array breaking the sentence (returned as result from axios) into words.Every word is an element of the new array

  console.log(wordsArray);
};

axiosCallToArray(); //now console.log works fine. This is valid also for your code

Answer 3

If colorList.data.data.colors has values then try

codes.push(colorList.data.data.colors[i]);