浅谈es6语法 (Proxy和Reflect的对比)
如下所示：
{
//原始对象
let obj={
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
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'){
//赋值并返回
return target[key]=value;
}else{
//不做操作直接返回
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); //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
}
以上这篇浅谈es6语法 (Proxy和Reflect的对比)就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持我们。
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