function UserInfo(info){
this.username=info.username
this.age=info.age
this.getInfo=(key)=>{
return this[key]
}
this.setInfo=(key,value)=>{
this[key]=value
}
}
const {getInfo,setInfo}=new UserInfo({
username:"geyao",
age:"18"
})
console.log(getInfo,"getInfo is")
console.log(getInfo('username'))
console.log(getInfo('age'))
运行结果