'use strict'
let a = {name:'ykl'}
console.log(a)
let c = 18
Object.defineProperty(a,'age',{
value: 22,
writable:false,
enumerable: true,
configurable:false,
})
a.age = 1122
console.log(a.age)
console.log(Object.keys(a))
console.log(Object.entries(a))
Object.defineProperty(a,'age',{
value: 22,
writable:false,
enumerable: true,
configurable:false,
})
delete a.age;