javascript inner function variable access from outside

Question

Here is my code. I need to access inner function variable in outer function

var json = {}, state, response;
readRequestValues();
var xhr = new XMLHttpRequest();
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.onreadystatechange=function(){
 if(xhr.readyState == 4){
    json.state = xhr.readyState;
    json.response = xhr.responseText;
    log.info(">>>>>>>>>>>>>>>"+json.state+">>>>>"+json.response);
    var retValue=JSON.stringify(json);
    log.info(">>> THIS IS RESULT >>>"+retValue);

 }
}
xhr.open("GET", strBackend, true);//async=true
xhr.send();

log.info(">>> HERE I NEED TO ACCESS retValue >>>"+retValue);

Thanks

Answer 1

You can't. It not received yet here.
You should call any code, when we get it:

var json = {}, state, response;
readRequestValues();
var xhr = new XMLHttpRequest();
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.onreadystatechange=function(){
 if(xhr.readyState == 4){
    json.state = xhr.readyState;
    json.response = xhr.responseText;
    log.info(">>>>>>>>>>>>>>>"+json.state+">>>>>"+json.response);
    var retValue=JSON.stringify(json);
    log.info(">>> THIS IS RESULT >>>"+retValue);

    logValue(retValue); // here we call logger

 }
}
xhr.open("GET", strBackend, true);//async=true
xhr.send();


function logValue(val) {
  log.info(">>> HERE I NEED TO ACCESS retValue >>>"+val);
}