let obj = {            time: '2017-7-20',            name: 'set',            _r: 123         };let daili = new Proxy(obj,{                has(target,key){                if (key==='name'){                    return target[key];                 }else{                    return false;                 }             }         });console.log('name' in obj,'time' in obj); //true true 后面的應該是false啊