2.1 "鸭子"类型 "鸭子"类型??(黑人问号), 第一次看到这名词我也很懵逼, 其实它说的是结构型类型，而目前类型检测主要分为结构型(structural)类型以及名义型(nominal)类型。interface Point2D {x: number;y: number; } interface Point3D {x: number;y: number;z: number; } var point2D: Point2D = { x:0, y: 10} var point3D: Point3D = { x: 0, y: 10, z: 20}function iTakePoint2D(point: Point2D) { /*do sth*/ }iTakePoint2D(...