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  function Parent(param1,param2){
    this.param1 = param1
    this.param2 = param2
    Parent.prototype.publicFunc = function(){
      console.log('this is public func')
    }
  }

  const child = new Parent('param1','param2')

  function creatObj(o){
    function F(){}
    F.prototype = o;
    return new F();
  }

  const obj = {
    name: 'name',
    age: '20'
  }
  function User(obj){
    let o = Object.create(obj);
    o.prototype.publicFunc = function(){
      console.log('--public func--')
    }
    return o;
  }

  function inherit(child,parent){
    const p = Object.create(parent.prototype);
    child.protoptype = p;
    p.constructor = child;
  }