Javascript : 'this' keyword inside function and arrow function

This keyword inside normal function and arrow function refers to the global object but if  function is inside of object then within normal function this refers current object and if it's arrow function then 'this' refers to the global object.

var val=500; //global variable

var obj={

    val:909,//local variable

    func1:function(){

        console.log(this.val); //909

       // console.log(this); //here this refres obj

    },

    func2:()=>{

        console.log(this.val);//500

        //console.log(this);// here this refers Global(Window object)

     }

}

console.log(obj.func1());

console.log(obj.func2());