function foo(n){

    if(n<2) return n;

    return foo(n-1)+foo(n-2);

}

let a=foo(6);

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function test(a){

    a=a+10;

}

var a=10;

test(a);

console.log(a);

---

 

---

var x=1234;

function test(x){

    console.log(x);

    var x=123;

    function x(){

   

    }

    console.log(x);

}

test(444);

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var obj={

    name:'jack',

    fun:function(){

       console.log(this.name);

    }

}

var obj2={

    name:'jay'

}

var fun=obj.fun.bind(obj);

fun.call(obj2);

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function f(n){

    if(n<=3){

        return 1;

    } else{

        return f(n-2)+f(n-6)+1;

    }

}

var a=f(12);

console.log(a);

(function(callback){

    person = {name:'Lily'};

    callback(person);

})(function(obj){

    obj.name = 'Lucy';

    obj = {name:'Marry'};

});

执行后name的值

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const fib=n=>n<=2?1:fib(n-2)+fib(n-1);

console.log(fib(5));

---

var user = {

    count:1,

    getCount:function(){

        return this.count;

    }

}

var func=user.getCount

console.log(func());

---