SOURCE

console.log(this === window);//true

var age = 40;
const obj = {
    name: "jack",
    age: 12,
    play: function () {
        console.log(this);
        console.log(this.name);
        console.log(this.age);
    },
    arrow: () => {
        console.log(this);
        console.log(this.name);
        console.log(this.age);
    }
}

()()