SOURCE

function getXH() {
    let xiaohong = {
        name: {
            first: '小红', 'last': '章'
        },
        age: 15
    };
    let keys = Object.keys(xiaohong);
    newXiaohong = new Proxy(xiaohong, {
        get(target, key) {
            let result = target[key];
            //如果是获取 年龄 属性，则添加 岁字
            if (key === "age") result += "岁";
            return result;
        },
        set(target, key, value) {
            debugger
            if (key === "age" && typeof value !== "number") {
                throw Error("age字段必须为Number类型");
            }
            if (keys.includes(key)) {
                console.error("不能修改属性");
            } else {
                target[key] = value;
            }
            // return Reflect.set(target, key, value);
        }
    });
    return newXiaohong;
}

const xiaohong = getXH()
//   console.log(`我叫${xiaohong.name}  我今年${xiaohong.age}了`);
//   xiaohong.age = 12;
xiaohong.name.age = 11;
console.log(xiaohong)