{  //原始對象 let obj={ time:'2017-03-11', name:'net', _r:123 }; //（代理商）第一個參數代理對象，第二個參數真正代理的東西 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}