Javascript：如何从输出中选择特定零件

Question

easy question:

 FunctionOutput: Promise {
  _c: 
   [ { promise: [Object],
       resolve: [Function],
       reject: [Function],
       ok: [Function],
       fail: [Function],
       domain: null } ],
  _a: undefined,
  _s: 1,
  _d: true,
  _v: 
   { body: 
      { token_type: 'bearer',
        access_token: 'token',
        expires_in: 7776000,
        refresh_token: 'token' },
     statusCode: 200 },
  _h: 0,
  _n: true }

This is my Output from a function and I want to specify output "access_token" How do I do that?

console.log("token is"+ data._v.body.access_token);

does not work...

Pls help Thanks a lot!

Answer 1

What you've shown is a promise . You'd use the promise via its then method:

data
.then(function(result) {
    // Use result here
})
.catch(function(err) {
    // Handle error here
});

We can't tell you how to access access_token on the result, because we don't know what part of what you've shown (if any) will be the resolution value. It may be result.access_token , or result.body.access_token . But you won't be able to access it except in a then callback.

data
.then(function(result) {
    console.log(result.body.access_token);
})
.catch(function(err) {
    // Handle error here
});

Answer 2

You can use destructuring if you just want to have the access_token

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment

 // whatever you're calling that returns that object const mockRequest = () => new Promise(resolve => resolve(res)) // response const res = { body: { token_type: 'bearer', access_token: 'token', expires_in: 7776000, refresh_token: 'token' }, statusCode: 200 } /* calls async function it then waits until its finsihed the request and "then" calls the then with the data Normally we would just return what ever comes back ie (data) => data.body.access_token But we can use a new ES6 feature which just returns the object name passed instead ie ({body}) => { token_type: 'bearer' ... */ function getAccess() { mockRequest() .then(({body: {access_token}}) => console.log(access_token)) .catch(err => console.log(err)) } getAccess(); /* // Or using es7 features such as async await async function getAccessES7() { const {body:{access_token}} = await mockRequest(); return access_token; } getAccessES7(); */