javascript - Function return async response -

this question has answer here:

• how return response asynchronous call? 21 answers

like person asked here (but solutions call nother function) https://stackoverflow.com/a/10796326/315200 ...i know if possible have function doesn't call second function on response of async request, return when async request responses.

something maybe:

function calltofacebook() {     var fbresponse;      fb.api('/me', function (response) {         fbresponse = response;     });      return fbresponse; //will return undefined because calltofacebook async } 

isn't possible way, without calling function??

what i'm trying achieve have 1 function can call parameters, return response object async webservice, fb.

in short, no. cannot have asynchronous function return meaningful value synchronously, because value not exist @ time (as built asynchronously in background).

you can, however, return promise object, representing "potential return value" of asynchronous operation, , bind function object using done() or similar. way, function gets return semantics (instead of having chain control flow callback), , remains asynchronous.