1. // 类型断言
    3. function getLength2(str:string|number):number{
    4.     if((<string>str).length){
    5.         return (<string>str).length
    6.     }else{
    7.         return str.toString().length
    8.     }
    9. }
    11. function getLength3(str:string|number){
    12.     if((str as string).length){
    13.         return (str).length
    14.     }else{
    15.         return str.toString().length
    16.     }
    17. }
    19. type Name = string;
    20. type NameResolve =()=>string;
    22. type NameOrResolve = Name | NameResolve;
    24. function getName(n:NameOrResolve):Name{
    25.     if(typeof n ==== string){
    26.         return (<string>n)
    27.     }else{
    28.         n()
    29.     }
    30. }
    32. interface A {
    33.     msg:string;
    34. }
    36. function helper(options:A):A{
    37.     return options
    38. }
    40. const xxA:A = {}
    43. interface Window {
    44.     a:number;
    45. }
    47. interface Window {
    48.     b:string
    49. }
    51. const s:Window =''
    54. declare module 'koa-swig'{
    55.     interface vue {
    56.         a:number;
    57.     }
    59.     interface vue {
    60.         b:string
    61.     }
    62. }