全局变量保持为空

Question

I have a piece of javascript code where I retrieve a list of employees via an ajax-call.

var employees_json = '';

Ajax.callbackAsync('getEmployees', ['2627016'],
    function(response){
        employees_json = response;

        console.log('this: '+ employees_json);
    },
    function(error){
        alert('Error while retrieving employees: '+ error);
    }
);

console.log('that: '+ employees_json);

(2627016 is the branch_id)

the output on the console:

this: [object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
that: 

Why is employees_json empty outside the ajax-call?
Or have I made a type I don't see!?!

Answer 1

your console.log is executed before the function(response) .

log is not like this ? : that: this: [object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

javascript is 1 thread , yet you never know when the callback function will run. so you have to adjust your code .