如何用JS实现简单的数据监听

const data = {
  name: "tom",
  age: 14
}
Object.defineProperty(data, "name", {
  get(){
    return "name被读取了"
  },
 set(val){
   console.log(‘我被赋值了‘,val)
 }
})
//将此代码放到浏览器控制台查看效果
console.log(data.name )

const _data = { ...data }
for(let i in data){
  Object.defineProperty(data, i, {
    get(){
      return _data[i]+"经过了js的修改"
    },
    set(val){
      _data[i] = val;
    }
  })
}

const data = {
  name: "tom",
  age: 14,
  friend: {
        "name1": "张三",
        "name2": "李四",
        "name3": "王五",
        "name4": "赵六"
  },
}

const createNewWatch = (val, path, parenTKEy, event) => {
       //如果值不是object类型，那么直接返回此值
       if(typeof val != ‘object‘) return val;
       //反之如果是object类型，那么调用WatchObject，在进行子元素的遍历及监听
       //WatchObject会在下面的代码中进行创建
       return WatchObject(val,path.concat(parentKey), event)
    }
广州品牌设计公司https://www.houdianzi.com

const WatchObject = (data, path, event) => {
  function WatchObject(){
    for(var key in data){
        //调用之前创建的函数，格式化val
        data[key] = createNewWatch(data[key], path, key, event)
        //创建对数据key的监听
        defineProperty(this, key, data[key], path.concat(key), event)
    }
  }
  return new WatchObject()
}

const b = WatchObject(data,[],{ 
    set(path,val){ 
      console.log(path,val) 
    } 
})