Proxy/Reflect

let numbers = [0, 1, 2];
numbers = new Proxy(numbers, {
  get(target, prop) {
    return target[prop] ? target[prop] : 0;
  },
  set(target, prop, value) {
    if (typeof value === 'number') {
      target[prop] = value;
      return true;
    } else {
      return false;
    }
  },
});
numbers[4] = 4;
// numbers[9] = '9'; //Error: 'set' on proxy: trap returned falsish for property '9'
console.log(numbers[1]);
console.log(numbers[78]);

let numbers = [0, 1, 2];
numbers = new Proxy(numbers, {
  get(target, prop) {
    return Reflect.get(target, prop);
  },
  set(target, prop, value) {
    if (typeof value === 'number') {
      Reflect.set(target, prop, value);
      return true;
    } else {
      return false;
    }
  },
});
numbers[4] = 4;
console.log(numbers[1]);
console.log(numbers[4]);

// 一个属性不能同时数据属性和
let _name = 'sfd';
let A = {
  get name() {
    return _name;
  },
  set name(name) {
    _name = name;
    this.getName();
  },
  getName: function () {
    console.log(this.name);
  },
};
A.name = 8080;
const A = {
  getName: function () {
    console.log(this.name);
  },
};
Object.defineProperty(A, 'name', {
  set(value) {
    this._name = value;
    this.getName();
  },
  get() {
    return this._name;
  },
});
A.name = 'Joy';
const _A = {
  name: 'sfd',
  getName: function () {
    console.log(this.name);
  },
};
const A = new Proxy(_A, {
  get(target, prop) {
    return Reflect.get(target, prop);
  },
  set(target, prop, value) {
    Reflect.set(target, prop, value);
    target.getName();
    return true;
  },
});
A.name = 'Joy';