Mimic Window. onerror in Opera using javascript

Question

I am currently working on a web application, I have a JS logging mechanism that Handles Javascript error that are not caught by the js code inside the page. I am using windo

Answer 1

you can replace Error.prototype.toString in Opera!

window.onerror = function (msg) {
  // send msg to http://errors.net/log.php, for example
  (new Image()).src = 'http://errors.net/log.php?msg=' + encodeURIComponent(msg);
};
if (({}).toString.call(window.opera) === '[object Opera]') {
 (function () {
   var x = Error.prototype.toString;
   Error.prototype.toString = function () {
     var msg = '';
     try {
       msg = x.apply(this, arguments);
       if (typeof (window.onerror) === "function") {
         window.onerror(msg, typeof (this) === 'object' ? this.stack : '', '');
       }
     } catch (e) {}
     return msg;
   };
 }());
}

seems, it doesn't work for Opera 11.50... only for early versions ...