{ 

 //原始對象
 let obj={
 time:'2017-03-11',
 name:'net',
 _r:123
 };
 //（代理商）第一個參數(shù)代理對象，第二個參數(shù)真正代理的東西
 let monitor=new Proxy(obj,{
 // 攔截對象屬性的讀取
 get(target,key){
  return target[key].replace('2017','2018')
 },
 // 攔截對象設置屬性
 set(target,key,value){
  if(key==='name'){
  //賦值并返回
  return target[key]=value;
  }else{
  //不做操作直接返回
  return target[key];
  }
 },
 // 攔截key in object操作
 has(target,key){
  if(key==='name'){
  return target[key]
  }else{
  return false;
  }
 },
 // 攔截delete
 deleteProperty(target,key){
  if(key.indexOf('_')>-1){
  delete target[key];
  return true;
  }else{
  return target[key]
  }
 },
 // 攔截Object.keys,Object.getOwnPropertySymbols,Object.getOwnPropertyNames
 ownKeys(target){
  return Object.keys(target).filter(item=>item!='time')
 }
 });

 console.log('get',monitor.time); //2018-03-11
 //操作
 monitor.time='2018';
 monitor.name='mukewang';
 console.log('set',monitor.time,monitor);//2018-03-11;{time: "2017-03-11", name: "mukewang", _r: 123}

 console.log('has','name' in monitor,'time' in monitor);//true;false

 delete monitor.time;
 console.log('delete',monitor);//{time: "2017-03-11", name: "mukewang", _r: 123}
 //
 delete monitor._r;
 console.log('delete',monitor);//{time: "2017-03-11", name: "mukewang"}

 console.log('ownKeys',Object.keys(monitor));//["name", "_r"]

}

{
 let obj={
 time:'2017-03-11',
 name:'net',
 _r:123
 };

 console.log('Reflect get',Reflect.get(obj,'time'));//get 2017-03-11
 Reflect.set(obj,'name','mukewang');
 console.log(obj);//{time: "2017-03-11", name: "mukewang", _r: 123}
 console.log('has',Reflect.has(obj,'name'));//true
}