The constructor creates an object and adds the function to the prototype，what is the 'this' pointing?

Question

When I add a normal function to the prototype, 'this' pointing is right，but when i use arrow function，the 'this' pointing is messive ，just like below picture

enter image description here

what is the 'this' pointing in the prototype function when i use arrow function?

function Person(name, age, address) {
    this.name = name;
    this.age = age;
    this.address = address;
    if (typeof Person._initialized === 'undefined') {
        Person.prototype.getName = function() {
            console.log(this);
        };
        Person._initialized = true;
    }
}
let person1 = new Person('12', 11, '123');
let person2 = new Person('122', 11, '1223');
person1.getName();
person2.getName();


function Person2(name, age, address) {
    this.name = name;
    this.age = age;
    this.address = address;
    if (typeof person2._initialized === 'undefined') {
        Person2.prototype.getName = ()=> {
            console.log(this);
        };
        Person2._initialized = true;
    }
}
let person11 = new Person2('12', 11, '123');
let person22 = new Person2('122', 11, '1223');
person11.getName();
person22.getName();