SOURCE

{
  function validator(target, validator, errorMsg) {
    return new Proxy(target, {
      _validator: validator,
      set(target, key, value, proxy) {
        if (target.hasOwnProperty(key)) {
          let va = this._validator[key];
          if ( !! va(value)) {
            return Reflect.set(target, key, value, proxy)
          } else {
            throw Error(`不能设置$(key)到$(value)`);
          }
        }else{
          throw Error(`$(key)不存在`);
        }
      }
    })
  }
  const personValidators = {
    name(value) {
      return value.length > 6;
    },
    age(value) {
  
      return typeof value=== 'number' && value > 16;
    }
  }
  class Person{
    constructor(name,age){
      this.name = name;
      this.age = age;
      return validator(this,personValidators);
    }
  }
  const person = new Person('lilei',3);
  console.log(person);
  person.age = 2;
}