封裝變數

refactorgram

let defaultOwner = {firstName: "Martin", lastName: "Fowler"};

let defaultOwnerData = {firstName: "Martin", lastName: "Fowler"};
export function defaultOwner()       {return defaultOwnerData;}
export function setDefaultOwner(arg) {defaultOwnerData = arg;}

別名自封裝欄位、封裝欄位