請給出這段代碼的運行結(jié)果

function Foo() {
  var i = 0;
  return function () {
    console.log(i++);
  }
}

var f1 = Foo();
var f2 = Foo();
f1(); // 0
f1(); // 1
f2(); // 0

var bb = 1;
function aa(bb) {
  bb = 2;
  console.log(bb);
};
aa(bb); // 2
console.log(bb); // 1

function t(a) {
  var a = 'hello';
  console.log(a);
  function a() {
    console.log(null);
  }
  console.log(a);
}
t(null);
// hello
// hello

function fn(b) {
  console.log(b);
  function b() {
    console.log(b);
  }
  b();
}
fn(10);
// [function: b]
// [function: b]

function a(b) {
  console.log(b);
  b = function () {
    console.log(b);
  };
  b();
}
a();
// undefined
// [Function: b]

function MyObj() {
  this.p.pid++;
}

MyObj.prototype.p = { pid: 0 };
MyObj.prototype.getNum = function (num) {
  return this.p.pid + num;
};

var _obj1 = new MyObj();
var _obj2 = new MyObj();
console.log(_obj1.getNum(1) + _obj2.getNum(2)); // 7

var func = (function (a) {
  this.a = a;
  return function (a) {
    a += this.a;
    return a;
  }
})(function (a, b) {
  return a;
}(1, 2));
console.log(func(4)); // 5

if(!('a' in window)){
  var a = 1;
}
console.log(a); // 1

(function () {
  var a = b = 3;
})();
// console.log(a); // ReferenceError: a is not defined
console.log(b); // 3

var myObject = {
  foo: 'bar',
  func: function () {
    var self = this;
    console.log(this.foo);
    console.log(self.foo);
    (function () {
      console.log(this.foo);
      console.log(self.foo);
    }());
  }
};
myObject.func();
// bar
// bar
// undefined
// bar

var a = 1;
if (!b in window) {
  var b = 2;
  a += 1;
}
console.log(a); // 1
console.log(b); // undefined

var m = 1;
function log() {
  var m = 2;
  return function () {
    m += 1;
  }
}
var _log = log();
_log();
console.log(m); // 1

for (var i = 0; i < 5; i++){
  (function () {
    setTimeout(function () {
      console.log(i);
    }, 1000);
  })(i);
}
// 5
// 5
// 5
// 5
// 5

function fun() {}
console.log(typeof fun); // function
console.log(fun instanceof Function); // true
console.log(fun instanceof Object); // true

var a = 1;
var obj = {
  a: 2,
  getA: function () {
    return this.a;
  }
};
console.log(obj.getA()); // 2
console.log(obj.getA.call()); // undefined
console.log(obj.getA.call({ a: 10 })); // 10

var arr = [1, 2, 3];
function test(arr) {
  arr = [];
}
test(arr);
console.log(arr); // [1, 2, 3]

function Foo() {
  getName = function () {
    console.log(1);
  }
}

Foo.getName = function () {
  console.log(2);
};

Foo.prototype.getName = function () {
  console.log(3);
};

var getName = function () {
  console.log(4);
};

function getName() {
  console.log(5);
}

Foo.getName(); // 2
getName(); // 4
Foo().getName(); // TypeError: Cannot read property 'getName' of undefined
getName(); // 4

new Foo.getName(); // 2
new Foo().getName(); // 3
new new Foo().getName(); // 3