javascript 常量

使用 const 我们仍然可以修改 javascript 对象的内容，但对该对象的引用将是不可变的。

const product = {name: "sugar", weight: "1 kg"};
product.name = "some new name";

console.log(product);

{
  name: "some new name",
  weight: "1 kg"
}

javascript 冻结

当我们不想修改对象的内容时，首选使用 freeze。

const product = {name: "sugar", weight: "1 kg"};
object.freeze(product);
product.name = "some new name";

console.log(product);

{
  name: "Sugar",
  weight: "1 kg"
}