var Person = function(name, param, work) {
  var _person = new Human(param);

  _person.name = new Named(name);

  _person.work = new Work(work);

  _person.changeWork = function(work) {
    _person.work = new Work(work)
  }

  return _person;
}

var Human = function(param) {
  // 技能
  this.skill = param && param.skill || '保密';
  // 兴趣爱好
  this.hobby = param && param.hobby || '保密';
}

Human.prototype = {
  getSkill() {
    return this.skill;
  },
  getHobby() {
    return this.hobby;
  }
}

var Named = function(name) {
  var that = this;
  (function(name, that) {
    that.wholeName = name;
    if (name.includes(' ')) {
      const [firstName, secondName] = name.split(' ');
      this.firstName = firstName;
      this.secondName = secondName;
    }
  })(name, that);
}

var Work = function(work) {
  var that = this;
  (function(work, that) {
    switch(work) {
      case 'code':
        that.work = '工程师';
        that.workDesc = '每天沉醉于编程';
        break;
      case 'UI':
        that.work = '设计师';
        that.workDesc = '设计更是一种艺术';
        break;
      default:
        that.work = work;
        that.workDesc = '暂不清楚';
        break;
    }
  })(work, that);
}

var p = new Person('xiao ming', { skill: 'JavaScript'}, 'code');

console.log(p.skill); // JavaScript
console.log(p.hobby); // 保密
console.log(p.work.workDesc); // 每天沉醉于编程
p.changeWork('UI');
console.log(p.work.workDesc); // 设计更是一种艺术