a piece of cake for interview

function parent(){
	this.thisFun = function(){
		innerFun();
		alert("thisFunction: " + this);
	}
	var innerFun = function(){
		alert("innerFunction: " + this);
	}
	return thisFun;
	
}
 parent()();

So easy,isn't it? 

What is the result? Tell us your answer.

Don't try to execute the program before you submit your answer.