JSON简化定义

var name = 'Ken.wong';
var age = 30;
var person = { name , age }
console.log(person); //{name: "Ken.wong", age: 30}

Object对象新增

Object.is(obja , objb)

判断两个值是否相等（只要长一样的都相等）

Object.is(NaN , NaN); //true
Object.is(+0, -0); //false
Object.is('abc', 'accc'); //false

Object.assign(obj1, obj2, …)

作用：复制对象、合并参数

var a = { a:1}, b={ b:2 }, c={ c:3 };
var t = Object.assign({} , a, b,c);
console.log(t); //返回一个新对象，{a: 1, b: 2, c: 3}

Ojbect.keys()

获取对象的键值；如果用在数组上，返回的则是数组元素的下标

//对象
var a = { a:1}, b={ b:2 }, c={ c:3 };
var t = Object.assign({} , a, b,c);
console.log(Object.keys(t)); //(3) ["a", "b", "c"]
//数组
var arr = [1,2,3];
console.log(Object.keys(arr)); //(3) ["0", "1", "2"]

Object.values()

获取对象的元素的值；如果用在数组上，返回的则是数组元素的值

//对象
var a = { a:1}, b={ b:2 }, c={ c:3 };
var t = Object.assign({} , a, b,c);
console.log(Object.values(t)); //(3) ["1", "2", "3"]
//数组
var arr = [1,2,3];
console.log(Object.values(arr)); //(3) ["1", "2", "3"]

Object.entries()

将对象转换成二维数组的形式返回

var arr = [1,2,3];
console.log(Object.entries(arr));
/**
0: (2) ["0", 1]
1: (2) ["1", 2]
2: (2) ["2", 3]
**/
var a = { a:1}, b={ b:2 }, c={ c:3 };
var t = Object.assign({} , a, b,c);
console.log(Object.entries(t));
/**
0: (2) ["a", 1]
1: (2) ["b", 2]
2: (2) ["c", 3]
**/