<script type="text/javascript">
var Foo= function(){}
var f1 = new Foo();
console.log(f1.__proto__ === Foo.prototype);
console.log(Foo.prototype.constructor === Foo);
var o1 =new Object();
console.log(o1.__proto__ === Object.prototype);
console.log(Object.prototype.constructor === Object);
console.log(Foo.prototype.__proto__ === Object.prototype);
//Function and Object
console.log(Function.__proto__ === Function.prototype);
console.log(Object.__proto__ === Function.prototype);
console.log(Object.prototype.__proto__);
console.log(Object.__proto__ === Function.prototype);
</script>