In javasctipt function, cannot call my method..?

var Even = myfunction();

function myfunction() {
 var objTask = {
        SenderID: parseInt(sessionStorage.getItem('UserID')) //userid
    }
    var pass =[];
$.ajax({
        type: "POST",
        url: "http://localhost:49534/TaskManagement.svc/TaskList",
        data: JSON.stringify(objTask),
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (data, status, jqXHR, result) {
        debugger;
        for (i = 0; i < data.length; i++) {
              pass.push ({"title": data[i].TaskName});
            }
        }
    });
    alert("Loding...");
   return pass;
}