how to return response of axios in return

问题

I want to return the response of axios but always the response that returned is undefined:

wallet.registerUser=function(data){
axios.post('http://localhost:8080/register',{
phone:data.phone,
password:data.password,
email:data.email
}).then(response =>{
  return response.data.message;
  console.log(response.data.message);
}).catch(err =>{
  console.log(err);
})
}

console.log(wallet.registerUser(data));

The console always logs as undefined. Is their any way returning this response.

回答1:

console.log won't wait for the function to fully complete before logging it. This means that you will have to make wallet.registerUser asynchronous, there are two main ways to do this:

1. Callback - this is when you pass a function as a parameter into your existing function which will be executed once your axios call has finished. Here is how it would work with your code:

   wallet.registerUser=function(data, callback){
     axios.post('http://localhost:8080/register',{
       phone:data.phone,
       password:data.password,
       email:data.email
     }).then(response =>{
       callback(response.data.message);
       console.log(response.data.message);
     }).catch(err =>{
       console.log(err);
     })
   }
   
   wallet.registerUser(data, function(response) {
     console.log(response)
   });
   

2. Promise - The easiest way to do this is to put async in front of your function name. This will make anything returned from the function return in the form of a promise. This is how it would work in your code:

    wallet.registerUser=async function(data){
     axios.post('http://localhost:8080/register',{
       phone:data.phone,
       password:data.password,
       email:data.email
     }).then(response =>{
       return response.data.message;
       console.log(response.data.message);
     }).catch(err =>{
       console.log(err);
     })
   }
   
   wallet.registerUser(data).then(function(response) {
     console.log(response);
   });
   

Here is some more information on asynchronous functions:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function

https://developer.mozilla.org/en-US/docs/Glossary/Callback_function

回答2:

I used async and await methods and wrapped my axios call and function calling the axios call in these methods. I returned axios value as well as returned response object within it. I have shared the snippet in the below link.

Returning data from Axios API

来源：https://stackoverflow.com/questions/45620694/how-to-return-response-of-axios-in-return