Invoke method in from within a callback

js-method-in-callback.js

 function MyClass() {
     this.myCallback = function() {
         alert("MyClass.myCallback()");
     };

     this.startRequest = function() {
         var myself = this;
         GM_xmlhttpRequest({
             'method': 'GET',
             'url': "http://www.google.com/",
             'onload': function (xhr) {
                 myself.myCallback();
             }
         });
     };
 }