javascript - function that return a value from ajax call request

I want a function that returns a value from an ajax request. I want to stop javascript execution until the function get its value which is return by ajax asynchronous request.
Something like:

function myFunction() {
    var data;
    $.ajax({
        url: 'url',

        data: 'data to send',
        success: function (resp) {
            data = resp;
        },
        error: function () {}
    }); // ajax asynchronus request 
    return data; // return data from the ajax request
}

Answer

You need to register a callback function, something like this:

function test() {
    myFunction(function(d) {
        //processing the data
        console.log(d);
    });
}

function myFunction(callback) {

    var data;
    $.ajax({
        url: 'url',
        data: 'data to send',
        success: function (resp) {
            data = resp;
            callback(data);
        },
        error: function () {}
    }); // ajax asynchronus request 

    //the following line wouldn't work, since the function returns immediately
    //return data; // return data from the ajax request
}