如何使引用类型属性"只读"

// 使用 Object.freeze() 方法冻结对象
const obj = {
  prop1: "value1",
  prop2: "value2"
};
const frozenObj = Object.freeze(obj);
console.log(frozenObj); // { prop1: "value1", prop2: "value2" }
frozenObj.prop1 = "newValue"; // 无法更改属性值
console.log(frozenObj); // { prop1: "value1", prop2: "value2" }

// 使用 Object.defineProperty() 方法定义属性
const obj2 = {
  prop1: "value1",
  prop2: "value2"
};
Object.defineProperty(obj2, "prop1", {
  writable: false // 设置属性为只读
});
console.log(obj2); // { prop1: "value1", prop2: "value2" }
obj2.prop1 = "newValue"; // 无法更改属性值
console.log(obj2); // { prop1: "value1", prop2: "value2" }

// 使用 const 关键字声明变量
const prop1 = "value1";
console.log(prop1); // "value1"
prop1 = "newValue"; // 抛出错误：TypeError: Assignment to constant variable.