const data = {
  name: "tom",
  age: 14
}
Object.defineProperty(data, "name", {
  get(){
    return "name被讀取了"
  },
 set(val){
   console.log(‘我被賦值了‘,val)
 }
})
//將此代碼放到瀏覽器控制臺查看效果
console.log(data.name )

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

const data = {
  name: "tom",
  age: 14,
  friend: {
        "name1": "張三",
        "name2": "李四",
        "name3": "王五",
        "name4": "趙六"
  },
}

const createNewWatch = (val, path, parentKey, event) => {
       //如果值不是object類型，那么直接返回此值
       if(typeof val != ‘object‘) return val;
       //反之如果是object類型，那么調(diào)用WatchObject，在進行子元素的遍歷及監(jiān)聽
       //WatchObject會在下面的代碼中進行創(chuàng)建
       return WatchObject(val,path.concat(parentKey), event)
    }
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const WatchObject = (data, path, event) => {
  function WatchObject(){
    for(var key in data){
        //調(diào)用之前創(chuàng)建的函數(shù)，格式化val
        data[key] = createNewWatch(data[key], path, key, event)
        //創(chuàng)建對數(shù)據(jù)key的監(jiān)聽
        defineProperty(this, key, data[key], path.concat(key), event)
    }
  }
  return new WatchObject()
}

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