浅谈es6语法 (Proxy和Reflect的对比)
如下所示:
{ //原始对象 letobj={ time:'2017-03-11', name:'net', _r:123 }; //(代理商)第一个参数代理对象,第二个参数真正代理的东西 letmonitor=newProxy(obj,{ //拦截对象属性的读取 get(target,key){ returntarget[key].replace('2017','2018') }, //拦截对象设置属性 set(target,key,value){ if(key==='name'){ //赋值并返回 returntarget[key]=value; }else{ //不做操作直接返回 returntarget[key]; } }, //拦截keyinobject操作 has(target,key){ if(key==='name'){ returntarget[key] }else{ returnfalse; } }, //拦截delete deleteProperty(target,key){ if(key.indexOf('_')>-1){ deletetarget[key]; returntrue; }else{ returntarget[key] } }, //拦截Object.keys,Object.getOwnPropertySymbols,Object.getOwnPropertyNames ownKeys(target){ returnObject.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'inmonitor,'time'inmonitor);//true;false deletemonitor.time; console.log('delete',monitor);//{time:"2017-03-11",name:"mukewang",_r:123} // deletemonitor._r; console.log('delete',monitor);//{time:"2017-03-11",name:"mukewang"} console.log('ownKeys',Object.keys(monitor));//["name","_r"] } { letobj={ time:'2017-03-11', name:'net', _r:123 }; console.log('Reflectget',Reflect.get(obj,'time'));//get2017-03-11 Reflect.set(obj,'name','mukewang'); console.log(obj);//{time:"2017-03-11",name:"mukewang",_r:123} console.log('has',Reflect.has(obj,'name'));//true }
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