1. /* public-static-readonly */
    2. interface attrs{
    3.     readonly id:number;
    4.     name:string;
    5.     /* 可选属性 */
    6.     age?:number;
    7. }
    8. var obj:attrs={
    9.     id:12,
    10.     name:"lisi"
    11. }
    12. obj.name = "zhang";
    13. // obj.id = 14;//只读属性不可更改
    14. console.log(obj);