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var num =10;
let obj={num:20};
obj.fn=(function(num){
    this.num=num*3;
    num++;
    return function(n){
        this.num +=n;
        num++;
        console.log(num)
    }
})(obj.num)

let fn=obj.fn;

fn(5)

obj.fn(10)

console.log(num,obj.num)