var person = {
  name: '小明',
  age: 32,
  1: '2',
  gender: 'male',
  interests: ['吃飯', '睡覺', '打動動'],
  greeting: function() {
    console.log("Hi! I'm " + this.name[0] + '.');
  },
  哈囉: function() {
    console.log('我是' + this.name);
  }
};

// 如何取得上述的所有屬性值

person.name
person.age
person.gender
person.interests
person.greeting()

person.1  // Uncaught SyntaxError: Unexpected number
person[1]
person['1']

person[哈囉]  // Uncaught ReferenceError: 哈囉 is not defined
person.哈囉
person.哈囉()
person['哈囉']()

function callName() {
  console.log('呼叫小明');
}
callName.ming = '小明';

var a = 1;
a.a = 2;
console.log(a.a);

var a = new Number(1);
a.a = 2;
console.log(a.a)

function fn() {
  return 1;
}
fn.return = 2;
console.log(fn.return);

var a = 1;
function fn() {
  a = fn.a;
}
fn.a = 2;
console.log(a);

var family = {
  name: '小明家',
  members: {
    father: '老爸',
    mom: '老媽',
    ming: '小明'
  },
};
var member = family.members;
// 問題 重新賦予值是否影響
member = {
  ming: '大明'
};
// 問題 2 修改單一屬性是否有影響
member.ming = '杰倫';
var ming = family.members.ming;

var a = {};
var b = { b: 'c' };
var c = { c: 'b' };
a[b.b] = 123;
a[c.c] = 456;
console.log(a['b']);

var a = {
  '哈囉': 1,
}

var hello = '哈囉';

console.log(a[hello]);  // 1

var a = {};
var b = { key: 'b' };
var c = { key: 'c' };
a[b] = 123;
a[c] = 456;
console.log(a[b]);

String(b) // [object, object]

console.log(a)  // { [object, object]: 456 }

var prop = '1';
var obj = {
  1: function() {
    console.log('1');
  },
  prop: function() {
    console.log('2');
  }
};
obj[prop]();

var a = {};
a.a = a;
console.log(a.a.a === a.a);

var a = { x: 1 };
var b = a;
a.x = a = { x: 2 };

console.log(a);
console.log(b);

var a = {};
var b = (a = {});
console.log(a === b);