function Person(){
}
var person = new Person()
console.log(person.__proto__ === Person.prototype)
console.log(Person.prototype.constructor === Person)
console.log(Person.prototype.__proto__ === Object.prototype)
console.log(Object.prototype.constructor === Object)
console.log(Object.prototype.__proto__ === null)
console.log(Person.__proto__ === Function.prototype)
console.log(Function.__proto__ === Function.prototype)
console.log(Function.prototype.constructor === Function)
console.log(Function.prototype.__proto__ === Object.prototype)
console.log(Object.__proto__ === Function.prototype)
console