js动态往对象里边添加一项详解编程语言

第一种方法 
let obj ={"name":"tom","age":16} 
let key = "id"; 
let value = 2 
obj[key] = value; 
console.log(obj) 
 
第二种方法，利用扩展运算符,简单又实用 
var obj1={"vue":300,"jquery":200}; 
var obj2={"react":500}; 
var obj3={ 
	...obj1, 
	...obj2 
} 
console.log(obj3) 
 
第三种办法 
let obj4 = {a:"1"}; 
let obj5 = {b:"2"}; 
let obj6 = {c:"3"}; 
Object.assign(obj4,obj5,obj6); 
console.log(obj4)