Is there a case where self.location! = Document.location?

Question

Is there a case in JavaScript when self.location != document.location?

Answer 1

The property window.selfis a reference to window, and window.locationis the same object as document.location.

Thus, the only way to return this expression is to override either self, or document.

Answer 2

I suppose it depends on the scope. As far as I know, you can (re) define selfin an object or even in a global scope, so in this case self.locationit will not indicate anything. Like this:

//[in global scope]
var self = new SomeObject;
alert(self.loction); //undefined

//in a constructor
function SomeObject(){
  var self = this;
  alert(self.location); //undefined
}

: self document

Answer 3

document.location - , not an object, and it has been replaced by document.URL.

The URL redirected by the server should not update window.location, but document.URL always shows the path to the current document.

Answer 4

Since I cannot post a comment, apparently self.location== document.location== window.locationin the frame. Only top.locationdifferent. (Tested in Firefox 3.6.6 and Internet Explorer 8)