以下判断均为true
function Person(){}
var person1=new Person()
console.log(person1.__proto__ == Person.prototype)
console.log(person1.constructor == Person)
console.log(Person.__proto__ == Function.prototype)
console.log(Person.prototype.constructor == Person) //注意
console.log(person1.__proto__.constructor == Person)
console.log(Person.prototype.__proto__ == Object.prototype)
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var F = function(){}
Object.prototype.a = function(){};
Function.prototype.b = function aa(){}
var f = new F();
题目: f.a和f.b存在吗?是什么?为什么?