How to implement simple data monitoring with JS

const data = {
  name: "tom",
  age: 14
}
Object.defineProperty(data, "name", {
  get(){
    return "name was read"
  },
 set(val){
   console.log('I was assigned',val)
 }
})
//Put this code in the browser console to view the effect console.log(data.name)

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

const data = {
  name: "tom",
  age: 14,
  friend:
        "name1": "Zhang San",
        "name2": "Li Si",
        "name3": "Wang Wu",
        "name4": "Zhao Liu"
  },
}

const createNewWatch = (val, path, parentKey, event) => {
       //If the value is not of object type, return the value directly if(typeof val != 'object') return val;
       //On the contrary, if it is of object type, then call WatchObject to traverse and monitor the child elements //WatchObject will be created in the following code return WatchObject(val,path.concat(parentKey), event)
    }
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const WatchObject = (data, path, event) => {
  function WatchObject(){
    for(var key in data){
        //Call the function created previously to format val
        data[key] = createNewWatch(data[key], path, key, event)
        //Create a listener for the data key defineProperty(this, key, data[key], path.concat(key), event)
    }
  }
  return new WatchObject()
}

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