TypeScript变量，它包含一个扩展基类的类实例

Question

我想要一个变量来存储一个类实例数组，但我想指定数据类型作为从“基”类继承的任何东西。这更好地通过示例演示：

class Mom { } //Base class 
class Son extends Mom { } 
class Daughter extends Mom { } 

//What is the syntax for this? 
let example : <T extends Mom>T[] = [ ]; //This array should store anyting that extends 'Mom' 

//The this would be possible 
example.push(new Mom()); 
example.push(new Son()); 
example.push(new Daughter()); 

在此先感谢。

Answer 1

尝试这种方式

let example : Array<Mom> = [ ]; 

见here

Answer 2

你可以做这样的事情

type Shape = Mom | Son | Daughter; 
let example:Array<Shape> = new Array<Shape>();