1、proxy

const data  = {
    name:"zhangsan",
    age:20
}
/* 代理和反射  */
const proxyData = new Proxy(data,{
    get(target,key,receiver){
        const result =  Reflect.get(target,key,receiver)
        console.log('get',key)
        return result //返回结果
    },
    set(target,key,val,receiver){ 
        const result =  Reflect.set(target,key,val,receiver)
        console.log('set',key,val)
        return result //是否设置成功 
    },
    deleteProperty(target,key){
        const result =  Reflect.deleteProperty(target,key)
        console.log('delete property',key);
        return result //是否删除成功
    }
})
delete proxyData.age
console.log(proxyData)