Question

我有这个场景，文件是t.ts：

interface Itest{
   (event: any, ...args: any[]):any;
   }

   var t1: Itest = function (testparam) { return true;};
   var t2: Itest = function (testparam, para1) { return true; };
   var t3: Itest = function (testparam, para1, para2) { return true; };


   interface Itest2 {
     (event: any, para1,...args: any[]): any;
   }
   var t4: Itest2 = function (testparam, para1) { return true; };
   var t5: Itest2 = function (testparam, para1, para2) { return true; };

当我用tsc 0.9.5编译它时，我得到以下错误：

tsc --target ES5  "t.ts"  
t.ts(6,8): error TS2012: Cannot convert '(testparam: any, para1: any) => boolean' to 'Itest':
    Call signatures of types '(testparam: any, para1: any) => boolean' and 'Itest' are incompatible:
        Call signature expects 1 or fewer parameters.
t.ts(7,8): error TS2012: Cannot convert '(testparam: any, para1: any, para2: any) => boolean' to 'Itest':
    Call signatures of types '(testparam: any, para1: any, para2: any) => boolean' and 'Itest' are incompatible:
        Call signature expects 1 or fewer parameters.
t.ts(14,8): error TS2012: Cannot convert '(testparam: any, para1: any, para2: any) => boolean' to 'Itest2':
    Call signatures of types '(testparam: any, para1: any, para2: any) => boolean' and 'Itest2' are incompatible:
        Call signature expects 2 or fewer parameters.

我错过了什么或者这个坏了吗？它曾用于0.9.1.1。谢谢！

Answer 1

由于rest参数是可选的，你需要在函数中使它们可选：

   interface Itest{
   (event: any, ...args: any[]):any;
   }

   var t1: Itest = function (testparam?) { return true;};
   var t2: Itest = function (testparam?, para1?) { return true; };
   var t3: Itest = function (testparam?, para1?, para2?) { return true; };


   interface Itest2 {
     (event: any, para1,...args: any[]): any;
   }
   var t4: Itest2 = function (testparam, para1) { return true; };
   var t5: Itest2 = function (testparam, para1, para2?) { return true; };

这是TS0.9.5中的新内容

typescript变量函数接口定义0.9.5中的参数数量

1 个答案: