export default {} // 可选属性 ? interface IFullName { firstName: string lastName: string age?: number } let goddessName: IFullName = { firstName: "邱", lastName: "淑贞", } // 只读属性 readonly interface IInfo { readonly uname: string readonly uage: number } let beauty:IInfo = { uname: "李庚希", uage: 18 } // beauty.uname = "赵丽颖" // beauty.uage = 28 // readonly VS const // const aaa = 123; // aaa = 456; interface IAAA { readonly aaa: number } interface IAAA { bbb: number } let aaabbb: IAAA = { aaa: 123, bbb: 456 } /* 总结: 如果我们要作为变量使用就使用 const 如果我们要作为属性使用就使用 readonly */