一、字面量
let obj = {}
二、构造函数
function Person(name,age){
this.age = age
this.name = name
}
const person = new Person('lisi',18)
三、class
class Person{
constructor(name,age){
this.name = name
this.age = age
}
}
const person = new Person('lihua',20)
console.log(person);
