Question

我正在尝试从节点模块中代理继承结构，并允许客户端实例化新的A类。目前，当尝试访问B类的父方法时，我得到a.parentMethod is not a function

handler.js ->
  module.exports = {
    get(target, key, receiver) {
      return target.getAttribute(key)
    },

    set(target, key, value, receiver) {
      return target.setAttribute(key, value)
    }
  }

A.js ->


const handler = require('handler')

class B {
  constructor(data) {
      this.data = data              
  }

  parentMethod() {
     ... do stuff
  }
}

class A extends B {
    constructor(data){
        super(data)
    }
}

module.exports = function(data) {
    return new Proxy(new A(data), handler)
}

////

const A = require('A')
var a = new A
a.parentMethod()

这个结构我哪里错了？我是Proxy的新手！

由于

编辑 -

进一步背景：

我正在尝试根据我定义的valueSchema保持属性集同步。当我设置Artwork.title时，我需要使用相同的值更新Artwork ['Artwork Title']。同样，当我检索Artwork.title时，我获得了Artwork ['Artwork Title']的价值。希望这有点帮助。我遇到了上述错误，所以我无法确定我写的内容确实有效！我正在尝试调试为什么首先找不到函数...

class Instance {

  constructor(data) {
    this._valueAttributes = {}
  }

  setAttribute(key, value) {
    if (this._isValueAttribute(key)) {
      return this._getSetValueAttribute(key, value)
    }
    throw Error('Cannot set invalid property '+key+' on instance.')
  }

  getAttribute(key) {
    if (this._isValueAttribute(key)) {
      return this._getSetValueAttribute(key)
    }
  }

  _getSetValueAttribute(key, value) {
    let schemaKey = this._getSchemaKey(key)
    if (_.isFunction(schemaKey)) {
      return alias(data)
    }

    if (value === undefined) {
      return this._valueAttributes[schemaKey]
    }

    return this._valueAttributes[schemaKey] = value
  }

  _isValueAttribute(key) {
    return _.keys(this._valueSchema).indexOf(key) === -1
  }

}


class Artwork extends Instance {

  constructor() {
    this._valueSchema = {
      medium: 'Artwork Medium',
      title: 'Artwork Title'
    }
  }
}


///

a = new Artwork

a.title = 'thing'
a['Artwork Medium'] = 'medium';

我需要

a.title == a['Artwork Title']
a['Artwork Medium'] == a.medium

我很可能已经把它搞砸了。我假设我可以从父级访问子级上的__valueSchema。这不可能吗？

是否可以在javascript

0 个答案: