Object vs Function

Object.prototype.sayhi = function() { alert("hi"); } var o = {}; alert(o.constructor); //function Object(){[native code]}, created by function Object() alert(Object.prototype); //[object Object], ultimate prototype o.sayhi(); //show hi Function.prototype.saybye = function() { alert("bye"); } alert(f.constructor); //function Function(){[native code]}, created by function Fuction() alert(Function.prototype); //function prototype{[native code]}, //I think Function.prototype still link to an object constant {}, //so that it can be route to [object Object], the ultimate prototype alert(Function.prototype.constructor); //function Function(){[native code]}, created by function Fuction() alert(f.prototype); //[object Object], ultimate prototype function f() { } f.sayhi(); //show hi f.saybye(); //show bye alert(document.constructor); //[objectHTMLDocument alert(document.constructor.prototype); //[Interface prototype object] alert(document.constructor.prototype.constructor); //null in IE, function Object() in firefox