const和Object.freeze是两个完全不同的概念。
const 声明一个只读的变量，一旦声明，常量的值就不可改变：
const person = {
name: "mybj"
};
let animal = {
species: "snake"
};
person = animal; // ERROR "person" is read-only
Object.freeze适用于值，更具体地说，适用于对象值，它使对象不可变，即不能更改其属性。
let person = {
name: "Mybj"
};
let animal = {
species: "snake"
};
Object.freeze(person);
person.name = "Lima"; //TypeError: Cannot assign to read only property 'name' of object
console.log(person);