ES6 6.Proxy和Reflect

Proxy

{
    let obj = {
        time: '2018-01-01',
        name: '玲珑',
        _r: 123
    }
    let monitor = new Proxy(obj,{
        //拦截对象属性的读取
        get(target,key){
            return target[key].replace('2018','2019');
        },
        //拦截对象属性
        set(target,key,value){
            if(key === 'name'){
                return target[key] = value;
            }else{
                return target[key];
            }
        },
        // 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')
        }
    })
    monitor.time = '2019';
    monitor.name = '安红豆';
    console.log(monitor.time);
    console.log(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));
}

输出结果：

proxy输出结果

Reflect

{
    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'));
}

输出结果：

reflect输出结果