原型

Object.prototype.constructor

Object.prototype

FuncFunction

FuncObject

foo.__proto__

foo

Function.prototype

Function.prototype.constructor

Foo.prototype__proto__

FuncFunction.prototype

Foo.prototype.constructor

Foo.prototype

FuncFoo

FuncFoo.prototype

null

new

FuncObject.prototype

Function.prototype.__proto__

Object.prototype.__proto__