代理模式

let obj = {
  name: "oli",
  canSave: false,
  blackbox: true
};

let proxyObj = new Proxy(obj, {
  set(obj, prop, val) {
    if (obj.canSave && prop === "name") {
      obj.name = val;
    } else return;
  },
  get(obj, prop) {
      if (obj.blackbox) {
          return null
      } else return obj[prop]
  }
});

let obj = {
  _name: "oli", // 实际的 name
  canSave: false,
  blackbox: true
};

let proxyObj = Object.defineProperty(obj, "name", {
  set(val) {
    if (obj.canSave) {
      obj.name = val;
    } else return;
  },
  get() {
    if (obj.blackbox) {
        return null
    } else return obj._name
  }
});