1. /* 类型别名 */
    2. //type自定义一个类型
    3. type StrOrNumber =  string | number;
    4. let res:StrOrNumber = "hello";
    5. let a:StrOrNumber = 213;
    6. /* 字面量  number只能等于1,赋其他的值报错*/
    7. const number:1 = 1;
    9. type Directions = "Up"|"Down"|"Left"|"Right"
    10. let toWhere:Directions= "Up";
    12. interface Iname{
    13.     name:string
    14. }
    15. /* 交叉类型 */
    16. type Person = Iname & {age:number};
    17. let p:Person = {
    18.     name:"lisi",
    19.     age:13
    20. }
    1. type Student = {
    2.     readonly name:string,
    3.     gender:string,
    4.     age?:number
    5. }
    6. var wang:Student = {
    7.     name:"李四",
    8.     gender:"男"
    9. }