let obj = {aaa: '111', bbb: '222', ccc: '333'} let objProxy = new Proxy(obj, { get(target, p, receiver) { return Reflect.get(target, p, receiver) }, set(target, p, value, receiver) { Reflect.set(target, p, value, receiver) return true }, deleteProperty(target, p) { Reflect.deleteProperty(target, p) return true } }) objProxy.aaa = "xxx" console.log(obj)//{aaa: "xxx", bbb: "222", ccc: "333"} delete objProxy.bbb console.log(obj)//{aaa: "xxx", ccc: "333"}