ES6初识-Proxy和Reflect

{

let obj={

time:'2017-03-11',

name:'net',

_r:123

};

 

let monitor=new Proxy(obj,{

// 拦截对象属性的读取

get(target,key){

return target[key].replace('2017','2018')

},

// 拦截对象设置属性

set(target,key,value){

if(key==='name'){

return target[key]=value;

}else{

return target[key];

}

},

// 拦截key in object操作

has(target,key){

if(key==='name'){

return target[key]

}else{

return false;

}

},

// 拦截delete

deleteProperty(target,key){

if(key.indexOf('_')>-1){

delete target[key];

return true;

}else{

return target[key]

}

},

// 拦截Object.keys,Object.getOwnPropertySymbols,Object.getOwnPropertyNames

ownKeys(target){

return Object.keys(target).filter(item=>item!='time')

}

});

 

console.log('get',monitor.time);

 

monitor.time='2018';

monitor.name='mukewang';

console.log('set',monitor.time,monitor);

 

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

 

// delete monitor.time;

// console.log('delete',monitor);

//

// delete monitor._r;

// console.log('delete',monitor);

console.log('ownKeys',Object.keys(monitor));

 

}

 

{

let obj={

time:'2017-03-11',

name:'net',

_r:123

};

 

console.log('Reflect get',Reflect.get(obj,'time'));

Reflect.set(obj,'name','mukewang');

console.log(obj);

console.log('has',Reflect.has(obj,'name'));

}