function getData(selector,callback) {
return $.ajax({
    url:"myurl/logs?" + selector,
    jsonp: "callback",
    dataType: "jsonp",
    success: callback
})
}

getData().done(function(result){
// my function here
}

[{"startTime":"2014-10-08T11:57:10.968Z","endTime":"2014-10-08T11:57:15.169Z"}]