SOURCE

//对象属性名

let breakfast = {};
let hotDrink='hot drink';
breakfast.dessert="面包";
// breakfast.drink="咖啡";
//针对空格的变量
breakfast['hot drink']="tea";
breakfast[hotDrink]="coffe";
console.log(breakfast);

//比较两个值是否相等
Object.is();//只是比较两个值是不是一样
console.log(Object.is(+0,-0)); //不相等
console.log(Object.is(NaN,NaN)); //相等

//Object.assign(target,source)把一个对象的属性定义到另一个对象

let food={};

Object.assign(
food,
  {desert:'面包'}
);
console.log(food.desert) //得到饿结果是面包