习题一

1. 选择以下代码输出值

const name = "Lydia";
age = 21;
console.log(delete name);
console.log(delete age);

2. 选择以下代码输出值

const person={name:'Lydia};
Object.defineProperty(person,'age',{value:21})
console.log(person);
console.log(Object.keys(person));

3. 选择以下代码输出值

function getAge() {
  "use strict";
  age = 21;
  console.log(age);
}
getAge();